A researcher wants to know how long it takes, on average, for a certain species of bacteria to divide. She watches 21 cells through a microscope and times how long it takes them to divide. She obtains the following data, in hours: 8.8, 7, 9.8, 8.4, 7.8, 8, 9.6, 7, 8.2, 8, 8.6, 8.6, 8.7, 7.3, 8.6, 7.3, 8.3, 8.6, 8.9, 7.6, 7.9 Assuming the population standard deviation is a = 0.6, construct a 99% confidence interval for the average time it takes this species of bacteria to divide. H= 8|2 2을 = Margin of Error: E =
Q: in an experiment to determine the effect of ambient temperature on the emissions of oxides of…
A: Given, In an experiment to determine the effect of ambient temperature on the emissions of oxides of…
Q: A researcher wishes to see if the total number of infections that occurred in three groups of…
A: For the given problem, we need to test whether the number of infections is same in the three groups.…
Q: The personnel director of a large hospital is interested in determining the relationship (if any)…
A: The objective of this question is to find the 90% confidence interval for the average number of sick…
Q: The data in the table represent the training times (in seconds) for Adam and Miguel. Adam 103…
A: Given: The data of the training times(in seconds) for Adam and Miguel is given. (a) For Adam's…
Q: The data shows 10 randomly selected people being asked how old is their car and how many miles are…
A: Let, X= age of the car and Y= Mileage on the car.Then by using R software1)By the given data, we…
Q: The following table shows the religious preference of college students living in two small…
A: Formula for Index of Qualitative Variation(IQV): Dorm A: Here, the number of categories is K=5.
Q: b) The number of planes to arrive at the Dubai International Airport over N days were recorded and…
A: From the given stem-and leaf display , the data of the number of arrivals are shown below. 20 21…
Q: An equal number of two-parent families, each with three children younger than ten years old were…
A:
Q: Suppose the doctors at a local office take a health survey of 100100 adult female patients with…
A: For the 100 participant's the following are the actual figures : By Physician By Participants…
Q: Mr. Acosta, a sociologist, is doing a study to see if there is a relationship between the age of a…
A: The null and alternative hypotheses for the test are: H0: The age and type of movies preferred are…
Q: ou will use the following data set to answer all parts of the project. This data set is the number…
A: (1). Find the values of mean, median, mode, sample variance, sample standard deviation: The data…
Q: The scientific productivity of major world cities was the subject of a recent study. The study…
A: Confidence interval for average is way to etimate the true population mean. We have to construct the…
Q: A consumer advocate researches the length of life between two brands of refrigerators, Brand A and…
A: From the information, given thatLet µ1 denotes the mean longetivity for Brand ALet µ2 denotes the…
Q: (a) Identify the value C2. (b) Identify the value R1. (c) Identify the value n.
A: (a) From the table, the value of C2 is 113. Thus, the value of C2 is 113. (b) From the table, the…
Q: 4. Consider a colony of raccoons. Assume that the raccoons live at most 5 years. Divide the female…
A: The female population of a colony of raccoons has an initial population of 100 females. The table…
Q: In an experiment to determine the effect of ambient temperature on the emissions of oxides of…
A: Data is given for 10 trucks : Emission on 40 degree and 80 degree Fahrenheit temprature noted :…
Q: Inastudy, data were collected simultaneously on two variables: Variable 1 and Variable 2. Variable 1…
A: There are 4 categories for variable 1 and 3 categories for variable 2.
Q: The number of children diagnosed with autism has increased in the last 30 years. Researchers wanted…
A: Given a sample of 5000 children. (A) The total number of girls =2500 The number of girls being…
Q: To the right is a stem-and-leaf display representing the amount of gasoline purchased, in gallons…
A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: Each year, researchers at the U.S. Bureau of Labor Statistics (BLS) administer the American Time Use…
A: A researcher complied a random sample of 12 Americans and asked each person how much time they spent…
Q: Community ecologists study the factors that determine the abundance of different species. The…
A: (a)Vectors that shows abundance of three algae species in lake A are (92,65,40) and (95,61,47)…
Q: i ca after participating in an aerobic exercise program and swi wn in the following table: Blood…
A: *Answer: Open a.Reject the Null Hypothesis. 5.465 > 1.761is the correct answer. * Explanation:
Q: The head of the production department of FPDJ Electronic Company wants to determine the relationship…
A: In this case, the number of workers (x) is the independent variable, and the number of units…
Q: Let μ1 represent the mean emission at 40°F and =μd−μ1μ2. Can you conclude that the mean emission…
A: The hypothesis is, Null hypothesis: H0:μd=0 Alternative hypothesis: H1:μd≠0 The difference is,…
Q: An article included data from a survey of 2857 hiring managers and human resource professionals. The…
A: Of the 2857 people who participated in the survey , 1300 indicated that they use social networking…
Q: The department of health studied the number of patients who need liver transplantation. The…
A:
Q: diet and exercise on blood cholesterol levels. The total cholesterol was measured in each subject…
A: Given, Blood Cholesterol Level Subject Before After 1 265 229 2 240 231 3 258 227 4 295…
Q: Suppose a certain virus (sorry!) affects 0.3% of the population. A test used to detect the virus is…
A: 0.3% of 100000 population have virus. 0.3*100000/100= 300 people have virus. 88% have virus and…
Q: The Population of a town in the last five censuses was given below. year 1940 1960 1970…
A:
Q: Question 1 Phil has always been an avid coffee drinker. However, a few years ago his close friend…
A: N = 500Day of the WeekMonTueWedThuFriSatSunNumber of…
Q: (b) Find the value of the chi-square statistic for the sample. (Round the expected frequencies to at…
A: Here we want to test whether the 500 fish in the sample were distributed as in given proportions.…
Q: The Fish and Game Department stocked a lake with fish in the following proportions: 30% catfish, 15%…
A: a) The value of alpha is 0.05.
Q: The scientific productivity of major world cities was the subject of a recent study. The study…
A: From the provided information, Sample size (n) = 20 Confidence level = 90%
Q: QOCH.C The number of cell phones per 100 residents in countries in Europe is given in Table #1 for…
A: For Cell Phones per 100 Residents in Europe: Sample x1 (x1-x̄1)^2 1 100 66.4225 2 112…
Q: A researcher wants to know how long it takes, on average, for a certain species of bacteria to…
A:
Q: Enteroliths are calcifications that form in the gut of horses. The stones can cause considerable…
A: The histogram for the number of horses for the enteroliths Age is given in the question.The…
Q: Do the data support the claim that low-fat diet and aerobic exercise are of value in producing a…
A: Given that Do the data support the claim that low-fat diet and aerobic exercise are of value in…
Q: A researcher conducted a paired samples study to investigate whether local car dealers tend to…
A: Given :
Q: Catfish Bass Bluegill Pike 122 89 218 71 A USE SALT e 5-year interval, did the distribution of fah…
A: Dear student as per guidelines we answer the first three subparts only. Solution To test hypothesis…
Q: Mr. Acosta, a sociologist, is doing a study to see if there is a relationship between the age of a…
A: Solution: Mr. Acosta, a sociologist, is doing a study to see if there is a relationship between the…
Q: v) Probability that a woman now aged 20, married.a man of aged 30, will survive after 30 years, but…
A: Given : Probability that a woman now aged 20,married a man of aged 30,Survive after 30 years.But by…
Q: The table below gives data on students in a certain school who took the SAT. % taking SAT % who…
A: Answer can be given using conditional probability.
Q: The scientific productivity of major world cities was the subject of a recent study. The study…
A: 15,3,3,30,3,10,20,21,19,4,5,19,8,30,10,4,15,15,13,19sample size(n)=20confidence level=99%
Q: The table below gives data on students in a certain school who took the SAT. % taking SAT 47% 30%…
A: The probability, PAB represents the conditional probability of happening of event A, provided event…
Q: men's basketball teams at NCSU (36 games) and UNC (37 games). The stems listed down the center of…
A: The given data can be arranged in frequency tables as:
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- Fifteen adult males between the ages of 35 and 50 participated in a study to evaluate the effect of diet and exercise on blood cholesterol levels. The total cholesterol was measured in each subject initially and then three months after participating in an aerobic exercise program and switching to a low-fat diet. The data are shown in the following table: Blood Cholesterol Level Before Subject After 1 265 229 2 240 231 3 258 227 4 295 240 5 251 238 6 245 m 241 234 7 287 8 314 256 9 260 247 10 279 239 11 283 246 12 240 13 238 218 219 226 233 14 225 15 247 Do the data support the claim that low-fat diet and aerobic exercise are of value in producing a mean reduction in blood cholesterol levels? Use a = 0.05 a. Fail to reject the Null Hypothesis. 5.465 > 1.753 b. Reject the Null Hypothesis. 5.465 > 1.761 c. None among the choices d. Reject the Null Hypothesis. 5.465 > 1.753A certain species of tree has an average life span of 130 years. A researcher has noticed a large number of trees of this species washing up along a beach as driftwood. She takes core samples from 27 of those trees to count the number of rings and measure the widths of the rings. Counting the rings allows the researcher to determine the age of each tree. Her data are displayed in the provided table. 98 79 147 200 130 60 51 127 105 75 120 113 200 190 81 98 160 165 134 62 152 66 68 124 190 159 60 One of her interests is determining if this sample provides evidence that the average age of the driftwood is less than the 130 year life span expected for this type of tree. If the average age is less than 130 years it might suggest that the trees have died from unusual causes, such as invasive beetles or logging. Use technology to create a randomization distribution with at least 1,000 values…The Fish and Game Department stocked a lake with fish in the following proportions: 30% catfish, 15% bass, 40% bluegill, and 15% pike. Five years later it sampled the lake to see if the distribution of fish had changed. It found that the 500 fish in the sample were distributed as follows. Catfish Bass Bluegill Pike 122 75 222 81 In the 5-year interval, did the distribution of fish change at the 0.05 level Find the value of the chi-square statistic for the sample. Estimate the P-value of the sample test statistic. P-value > 0.100 0.050 < P-value < 0.100 0.025 < P-value < 0.050 0.010 < P-value < 0.025 0.005 < P-value < 0.010 P-value < 0.005 Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis that the population fits the specified distribution of categories? Since the P-value > α, we fail to reject the null hypothesis. Since the P-value > α, we reject the null hypothesis. Since the…
- Commercial apple trees usually consist of two parts grafted together. The upper part, or graft, determines the character of the fruit, while the root stock determines the size of the tree.† The following data are from two root stocks, A and B. The data represent total extension growth (in meters) of the grafts after 4 years. Stock A 2.52 2.26 2.86 2.91 2.78 2.58 1.96 2.10 3.41 2.94 2.88 Stock B 2.81 3.02 1.94 2.37 3.11 2.71 2.74 2.44 2.13 1.58 2.77 Use a 1% level of significance and the rank-sum test to test the claim that the distributions of growths are different for root stocks A and B. Interpret the results.What is the level of significance? Compute the sample test statistic. (Round your answer to two decimal places.) Find the P-value of the sample test statistic. (Round your answer to four decimal places.)Errors in medical prescriptions occur relatively frequently. In a study, two groups of doctors had similar err rates and one group switched to e-prescriptions while the other continued with hand-written prescriptions. C year later, the number of errors was measured. The results are given in the two-way table. No Error Error 254 Electronic 3594 Written 1478 2370 a). Fill in the row and column totals. b). What proportion of all the prescriptions had errors in them? c). What proportion of electronic prescriptions had errors in them? d). What proportion of written prescriptions had errors in them? e). What proportion of the prescriptions with errors were written prescriptions?The scientific productivity of major world cities was the subject of a recent study. The study determined the number of scientific papers published between 1994 and 1997 by researchers from each of the 20 world cities, and is shown below. City Number of papers City Number of papers City 1 99 City 11 66 City 2 2020 City 12 44 City 3 2929 City 13 1313 City 4 3030 City 14 2929 City 5 2828 City 15 77 City 6 3030 City 16 1616 City 7 2727 City 17 2727 City 8 99 City 18 1515 City 9 2626 City 19 2929 City 10 2020 City 20 2727 Construct a 9090 % confidence interval for the average number of papers published in major world cities. <μ<<μ<
- QUESTION 10 Provide an appropriate response. A private opinion poll is conducted for a politician to determine what proportion of the population favors adding more national parks. What size sample should be obtained in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 3%? O 3017 O 1509 O 1068 O 20During a particularly dry growing season in a southern state, farmers noticed that there is a delicate balance between the number of seeds that are planted per square foot and the yield of the crop in pounds per square foot. The yields were the smallest when the number of seeds per square foot was either very small or very large. The data in the table show various numbers of seeds planted per square foot and yields (in pounds per square foot) for a sample of fields. A 2-column table with 15 rows. Column 1 is labeled number of seeds (per square foot) with entries 28, 75, 30, 43, 71, 35, 40, 59, 66, 79, 85, 81, 16, 33, 16. Column 2 is labeled yield (pounds per square foot) with entries 131, 171, 132, 166, 169, 150, 161, 183, 173, 161, 147, 157, 86, 145, 86. Which scatterplot represents the seed and yield data? A graph titled number of Seeds and Crop Yield has seeds (per square foot) on the x-axis, and yard (pounds per square foot) on the y-axis. The points curve up to a point, and…A researcher was studying how much electricity (in kilowatt hours) people in Spain and Germany used in their homes last year. The researcher took a random sample of people from each country to test if the average electricity usage was significantly different. Here is a summary of their results: Electricity usage Country Mean StDev SE mean Spain 100 1780 415 41.5 Germany 100 1690 405 40.5 95% CI for us - PG: 90 + 114.4 The researcher wants to use these results to test Ho: µs = PG versus H: µs # pG. Assume that all conditions for inference have been met. Based on the interval, what do we know about the corresponding P-value and conclusion at the a = 0.05 level of significance? The P-value is less than a=0.05, and they should conclude that there is a difference between the means. The P-value is less than a=0.05, and they cannot conclude that there is a difference between the means. The P-value is greater than a=0.05, and they cannot conclude that there is a difference between the means.…
- The scientific productivity of major world cities was the subject of a recent study. The study determined the number of scientific papers published between 1994 and 1997 by researchers from each of the 20 world cities, and is shown below. City Number of papers City Number of papers City 1 15 City 11 30 City 2 22 City 12 55 City 3 20 City 13 25 City 4 20 City 14 55 City 5 23 City 15 10 City 6 21 City 16 15 City 7 99 City 17 77 City 8 24 City 18 22 City 9 24 City 19 22 City 10 33 City 20 29 Construct a 9090 % confidence interval for the average number of papers published in major world cities. _______<μ<________CHAPTER 3. 1) A national health survey measured the serum HDL cholesterol levels in a large number of women. Following is a sample of 36 HDL levels (in milligrams per deciliter) that are based on the results of that survey. They have been sorted into numerical order. 25 26 26 26 27 28 33 34 36 37 37 38 41 41 42 43 44 44 44 44 45 45 45 46 46 47 50 51 56 58 64 66 68 69 80 85 (a) Find the first and third quartiles. (b) Find the median of these data. (c) Find the upper and lower outlier boundaries. (d) Are there any outliers? If so, list them. 1Mr. Acosta, a sociologist, is doing a study to see if there is a relationship between the age of a young adult (18 to 35 years old) and the type of movie preferred. A random sample of 93 adults revealed the following data. Test whether age and type of movie preferred are independent at the 0.05 level. Person's Age Movie 18-23 yr 24-29 yr 30-35 yr Row Total Drama 8 16 10 34 Science Fiction 10 8 12 30 Comedy 11 8 10 29 Column Total 29 32 32 93 (a) What is the level of significance?State the null and alternate hypotheses. H0: Age and movie preference are not independent.H1: Age and movie preference are independent.H0: Age and movie preference are independent.H1: Age and movie preference are independent. H0: Age and movie preference are not independent.H1: Age and movie preference are not independent.H0: Age and movie preference are independent.H1: Age and movie preference are not independent. (b) Find the value of the chi-square statistic for the sample. (Round…