Transport engineers are interested to study the pattern and the risk of accidents at a junction. Suppose we observe the following frequency distribution of the number of accidents in 150 weeks. Number of Accidents 0 1 2 3 4 5 6 7+ Observed frequency 50 30 24 30 10 5 10 Perform a goodness of fit test at the 5% significance level of the null hypothesis that the observed number of accidents follow a Poisson distribution. What is the p-value of your test
Q: Range anxiety is one of the reasons consumers are reluctant to switch to an electric vehicle, and…
A: Given information: x 89 90 91.5 92 92.5 95 95.5 96 93 93.5 94 94 91…
Q: You are testing the claim that smiling, rather than remaining neutral, during a court proceding will…
A: State the hypotheses. That is, there is no difference between two population means. That is, there…
Q: A researcher believes that the mean earnings of top-paid actors, athletes and musicians are the…
A: Given data Actor Athlete Musician 32 48 37 27 53 43 31 43 42 28 38 38 22 47 25 32 42…
Q: Available below are amounts of arsenic in samples of brown rice from three different regions. The…
A: State the hypotheses.
Q: Body Temperatures of Men and Women If we use the body temperatures from 8 AM on Day 2 as listed in…
A: The hypotheses can be constructed as: Null hypothesis: H0: µ1 = µ2 Alternative hypothesis: H1: µ1…
Q: Read this sample from the report. “In March 2015, 61 percent of workers in private industry had…
A: All categories do not represent industries not surveyed in the report because data points will not…
Q: A researcher is studying the effects of the college experience on attitudes, values, and behaviors…
A: given information: FRESHMAN SENIORS mean1=2.07 mean2=2.17s1=1.23…
Q: Reading test scores for Miss Brown's class averaged 75.9. Nationally, the scores were normally…
A: It is given that the mean and variance are 60.3 and 61.2, respectively.
Q: The owner of Maumee Motors wants to study the relationship between the age of a car and its selling…
A: Given that
Q: Determine the standard error of estimate. (Round your answer to 3 decimal places.) b.…
A: 1) The coefficient of determination, which is a measure of goodness of fit for a linear regression…
Q: A researcher wants to know if there is a relationship between gender and the likelihood of being a…
A: From the provided information, Male Female Total Yes 20 70 90 No 80 30…
Q: A researcher wants to know if there is a relationship between gender and the likelihood of being a…
A: The following information has been given: Male Female Yes 20 70 No 80 30…
Q: There have been numerous studies involving the correlation and differences in IQ's among siblings.…
A: Claim : Older siblings have a higher IQ than younger siblings Hypothesis : Null hypothesis : H0 :…
Q: Reconsider Dr. Sameer's research question about how much time Cal Poly students spend on watching…
A:
Q: Create a distribution of 1000 simulated sample statistics we might expect to see if the null…
A: The objective is to describe the shape, center, and variability of the distribution of simulated…
Q: Is the average length of time to earn a doctorate different from one field to another? Independent…
A: (a). Identify the level of significance: Level of significance: Level of significance is the…
Q: State the null and alternative hypothesis as an expression
A: Given that x1=12.5 x2=13.9 s1=3.9 s2=5.2 n1=14 n2=17
Q: 4. In a season a football team scored a total of 43 goals. The table below gives a summary of the…
A:
Q: According to a study conducted by a statistical organization, the proportion of people who are…
A: From the given data fill the required blanks
Q: A report from the National Center for Health Statistics for 2010 showed that 20% of the adult…
A: The objective of this question is to find the average number of adult smokers in a sample of 25…
Q: Current Year Previous Year Occupied Rooms 1,505 1,411 Total Rooms 1,750 1,700
A: Solution:- from given information x1= 1505 ,n1=1750 x2= 1411 ,n2=1700 null hypothesis…
Q: A researcher wants to know if exercise reduces anxiety in older people. She recruits a sample of…
A: A researcher wants to test whether exercise reduces anxiety in older people. We know that a sample…
Q: According to a study conducted by a statistical organization, the proportion of people who are…
A: The population is the data which includes all the observations that were used for the study. When…
Q: Arsenic Amounts (micrograms) A 4.9 4.9 4.9 5.2 5.3 5.5 5.6…
A: Given : A B C 4.9 2.3 5.7 4.9 3.6 5.7 4.9 4.5 6.7 5.2 4.6 6.9 5.3 4.8 7.1…
Q: The table below summarizes results for randomly selected drivers stopped by police in a recent year.…
A: Given, Black and Non-Hispanic White and Non-Hispanic Stopped by police 16 107 Not stopped…
Q: of various intensities and frequencies. Of these 45 listeners, 15 had normal hearing, 15 use at low…
A: Given the summary data as Groups Sample size Sample mean Sample variance Normal hearing 15…
Q: do online students perform differently than students in a traditional classroom? Las semester there…
A: From the provided information, The claim is that there is a difference in the average exam scores…
Q: Tourism is extremely important to the economy of Florida. Hotel occupancy is an often-reported…
A: Answers are in images uploaded below and calculation of p value is explained in last step. Thanks!
Q: Available below are amounts of arsenic in samples of brown rice from three different regions. The…
A: State the hypotheses.
Q: A SRS of 18 statistics examinations was taken from a large normal population. The average score in…
A: How many degrees of freedom are associated with the t-distribution for this test?
Q: You are interested in evaluating how well students perform on an attention test. There are two…
A: In this case, the two conditions "low noise and high noise" are dependent on each other. Both…
Q: Arsenic in Rice Listed below are amounts of arsenic in samples of brown rice from three different…
A:
Q: State the appropriate null and altemate hypotheses. Ho This hypothesis test is a (Choose one) test.…
A:
Q: credit score is used by credit agencies to assess the creditworthiness of individuals. Values range…
A: Sample size n =24 Sample mean=735.6 Standard deviation =74.5 NOTE:- According to bartleby guidelines…
Q: Motor Vehicle Fatalities The table below lists motor vehicle fatalities by day of the week for a…
A:
Q: Mean wait time. A medical clinic is interested in determining if there is a difference in patients…
A:
Q: The average retirement age in America is 64 years old. Do small business owners retire at a younge…
A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…
Q: The mean number of sick days an employee takes per year is believed to be about 10. Members of a…
A: Let μ denotes the population mean number of sick days an employee takes per year. The test is that…
Q: When a person states at the outset of an experiment that a higher average score will be received by…
A: Given that : The higher average score will be recevied by a group receiving some kind of treatment…
Q: Are people born in certain seasons more likely to be allergic to dust mites? Research suggests this…
A:
Q: Three different checkpoints in a water distribution system are tested for bacterial contamination.…
A: Given that, Three different checkpoints in a water distribution system are tested for bacterial…
Step by step
Solved in 2 steps with 3 images
- A magazine reports that women trust recommendations from a particular social networking site more than recommendations from any other social network platform. But does trust in this social networking site differ by gender? The following sample data show the number of women and men who stated in a recent sample that they trust recommendations made on this particular social networking site. Women Men Sample 150 170 Trust RecommendationsMade on the social networking site 117 102 (a) What is the point estimate of the proportion of women who trust recommendations made on this particular social networking site? (b) What is the point estimate of the proportion of men who trust recommendations made on this particular social networking site? (c) Provide a 95% confidence interval estimate of the difference between the proportion of women and men who trust recommendations made on this particular social networking site. (Round your answers to four decimal places.) toA graduate student is interested in how viewing different types of scenes affects working memory. For his study, he selects a random sample of 36 adults. The subjects complete a series of working memory tests before and after walking in an urban setting. Before the walk, the mean score on the test of working memory was 9.1. After the walk, the mean score was 1.4 higher. The graduate student has no presupposed assumptions about how viewing different types of scenes affects working memory, so he formulates the null and alternative hypotheses as: H00 : μDD = 0 H11 : μDD ≠ 0 Assume that the data satisfy all of the required assumptions for a repeated-measures t test. The graduate student calculates the following statistics for his hypothesis test: Mean difference (MDD) 1.4 Estimated population standard deviation of the differences (s) 1.6 Estimated standard error of the mean differences (sMDMD) 0.2667 Degrees of freedom (df) 35 The t statistic 5.25 The critical values of t…Where are the deer? Random samples of square-kilometer plots were taken in different ecological locations of a national park. The deer counts per square kilometer were recorded and are shown in the following table. Mountain Brush Sagebrush Grassland Pinon Juniper 30 20 5 25 59 10 25 16 2 24 19 4 Shall we reject or accept the claim that there is no difference in the mean number of deer per square kilometer in these different ecological locations? Use a 5% level of significance. (a) What is the level of significance?State the null and alternate hypotheses. Ho: ?1 = ?2 = ?3; H1: Exactly two means are equal.Ho: ?1 = ?2 = ?3; H1: At least two means are equal. Ho: ?1 = ?2 = ?3; H1: All three means are different.Ho: ?1 = ?2 = ?3; H1: Not all the means are equal. (b) Find SSTOT, SSBET, and SSW and check that SSTOT = SSBET + SSW. (Use 3 decimal places.) SSTOT = SSBET = SSW = Find d.f.BET, d.f.W, MSBET, and MSW. (Use 2 decimal places for MSBET, and MSW.)…
- Empathy: The Interpersonal Reactivity Index is a survey designed to assess four different types of empathy. One type of empathy, called Empathetic Concern measures the tendency to feel sympathy and compassion for people who are less fortunate. The index ranges from 0 (less empathetic) to 28 (more empathet The following data, representing random samples of 11 males and 11 females, are consistent with results reported in psychological studies. Boxplots show tha it is reasonable to assume that the populations are approximately normal. Can you conclude that the mean empathy score for men is less than the mean empathy score for women? Let μ₁ denote the mean empathy score for males and μ₂ denote the mean empathy score for females. Use the a=0.01 level and the critical value method with the table. 12 16 13 26 21 23 8 15 18 25 15 Males 21 23 15 26 25 28 24 16 19 20 23 Females Part 1 of 6 Send data to Excel State the appropriate null and alternate hypotheses. H₁ | M₁ = μ₂ H₁ :|µ₁ <µ₂ This is a…Tourism is extremely important to the economy of Florida. Hotel occupancy is an often-reported measure of visitor volume and visitor activity (Orlando Sentinel, May 19, 2018). Hotel occupancy data for February in two consecutive years are as follows. Current Year 1,476 1,800 Occupied Rooms Total Rooms 1,422 1,800 a. Formulate the hypothesis test that can be used to determine whether there has been an increase in the proportion of rooms occupied over the one-year period. Let P₁= population proportion of rooms occupied for current year P2 population proportion of rooms occupied for previous year - P2 less than or equal to 0 greater than 0 Ho P1 Ha P1 P2 b. What is the estimated proportion of hotel rooms occupied each year (to 2 decimals)? Current year .80 X Previous Year .77 c. Conduct a hypothesis test. What is the p-value (to 4 decimals)? Use Table 1 from Appendix B. Previous Year p-value = 0.0166 Using a 0.05 level of significance, what is your conclusion? We can conclude that there…Identify the statistical procedures that are appropriate for the data. When possible, identify descriptive statistics, inferential statistics, and a measure of effect size Research suggests that the antioxidants in foods such as blueberries can reduce and even reverse age-related declines in cognitive functioning ( Joseph et al., 1990) to test this phenomenon, a researcher selects a sample of n = 25 adults aged 70 to 75 and administers a cognitive function test to each participant. The participants then drink a blueberry supplement every day for 4 months before they are tested again. The researcher compares the scores before treatment with the scores after treatment to see if there is any change ion cognitive function.
- Available below are amounts of arsenic in samples of brown rice from three different regions. The amounts are in micrograms of arsenic and all samples have the same serving size. Use a 0.05 significance level to test the claim that the three samples are from populations with the same mean. Do the amounts of arsenic appear to be different in the different regions? Given that the amounts of arsenic in the samples from region C have the highest mean, can we conclude that brown rice from region C poses the greatest health problem? view the data table of the arsenic amounts. Arsenic Amounts (micrograms) A 4.9 4.9 4.9 5.2 5.3 5.5 5.6 5.7 5.8 5.9 6.1 6.3 B 2.3 3.6 4.5 4.6 4.8 4.8 4.8 5.1 5.1 5.4 5.4 5.5 C 5.7 5.7 6.7 6.9 7.1 7.2 7.2 7.3 7.3 7.4 7.5 7.6 What are the hypotheses to test? H0: mu 1 equals mu 2 equals mu 3μ1=μ2=μ3 H1: At least one…A survey was developed to estimate the average number of hours per week that adults spend exercising. Every third person entering a large fitness complex was surveyed, with a total of 2,500 people being surveyed. The data showed that the mean number of hours spent exercising was 3.2 hours per week. Which characteristic of the survey could create a bias in the results? The size of the sample The size of the sample The method of analyzing the data The method of analyzing the data The method of choosing the people who were surveyed The method of choosing the people who were surveyed The size of the population2. Introduction to variability A researcher is studying psychological factors in athletic achievement among teenage boys. One variable he is particularly interested in is competitiveness. What information does a measure of variability for the variable competitiveness convey? Check all that apply. What is the central tendency for the variable competitiveness among teenage boys? What is the average value for the variable competitiveness among teenage boys? Do all teenage boys have the same amount of competitiveness? How consistent are the values for competitiveness among teenage boys?
- Describe a study in which you can use both nonparametric and parametric statistics. A researcher has participants expecting to receive either painful or mild electrical shocks during a study wait in a quarter-full waiting room with other participants. He then measures whether they choose to sit next to other participants or if they sit far away on their own. What is the best test to run for this study and why?Motor Vehicle Fatalities The table below lists motor vehicle fatalities by day of the week for a recent year (based on data from the Insurance Institute for Highway Safety). Use a 0.01 significance level to test the claim that auto fatalities occur on the different days of the week with the same frequency. Provide an explanation for the results.Tourism is extremely important to the economy of Florida. Hotel occupancy is an often-reported measure of visitor volume and visitor activity (Orlando Sentinel, May 19, 2018). Hotel occupancy data for February in two consecutive years are as follows. Current Year Previous Year Occupied Rooms 1,360 1,386 Total Rooms 1,700 1,800 a. Formulate the hypothesis test that can be used to determine whether there has been an increase in the proportion of rooms occupied over the one-year period. Let pi = population proportion of rooms occupied for current year Pa= population proportion of rooms occupied for previous year Ho : Pi - Pa H.: Pi - P2 Select your answer Select your answer b. What is the estimated proportion of hotel rooms occupied each year (to 2 decimals)? Current year Previous Year c. Conduct a hypothesis test. What is the p-value (to 4 decimals)? Use Table 1 from Appendix B. p-value - Using a 0.05 level of significance, what is your conclusion? We Select your answer- vthat there has…