In deciding how many customer service representatives to hire and in planning their schedules, it is important for a firm marketing electronic typewriters to study repair times for the machines. Such a study revealed that repair times have approximately an exponential distribution with a mean of 42 minutes. Find the probability that a repair time will last less than 17 minutes.
Q: The blue catfish (Ictalurus Furcatus) is the largest species of North Amercian catfish. The current…
A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…
Q: It currently takes users a mean of 13 minutes to install the most popular computer program made by…
A: Hypothesis is an assumption or statement about the population parameter. Usually, hypothesis test…
Q: 2. InnerSloth continue to update their popular video game Among Us.² Scraping their server logs, we…
A: The summary statistics provided in the question are as follows : Let variable x represents the…
Q: en the current Center of Disease Analytics statistics, the probability of having the flu in our area…
A: event A= having flup(having the flu in our area)=0.10p(A)=0.10P(A')=1-0.10=0.90event B=report…
Q: State the frequency at or above the 80th percentile (include the frequency at the 80th percentile) :…
A: Percentile is calculated by dividing the population into 100 equal groups. from the given data the…
Q: Suppose that, for one semester, you can collect the following data on a random sample of college…
A: Given information: For one semester, the data was collected from a random sample of college juniors…
Q: The National School Lunch Program took a random sample of students who ordered school lunch. Use the…
A: The given data is as follows:Fruit JuiceChocolate MilkTotalCheese Pizza33%55%Chicken…
Q: Suppose that we know that 33.8% of the people born in the United States between 1936 and 1951 have…
A: The given situation follows binomial distribution. The proportion of people born in United States…
Q: ccording to a 2006 survey conducted by the Center for Disease Control and Prevention (CDC), birth…
A: Given that The "Birth Data.jasp" contains the birth months for 1380 babies (N = 1380) born during…
Q: Researchers claim that the surface temperature of the world's oceans mainly changes with changing…
A: The purpose of this experiment is to examine the claim that the surface temperature of the world's…
Q: Which of the three brands had the smallest mean lifetime?
A: We are given a dot plot of brands and lifetimes. We need to answer the brand name with the smallest…
Q: According to a 2006 survey conducted by the Center for Disease Control and Prevention (CDC), birth…
A: Chi square is used to determine whether the variables are independent or not. Chi square test are of…
Q: The average number of pounds of red meat a person consumes each year is 196 with a standard…
A: We are given,μ = 196σ = 22n = 60
Q: A graduating class reported starting salaries represented on the following frequency table.…
A: Solution Find the mean of starting salary Number of students fi Starting salary Xi ($) fi*Xi…
Q: Researchers recruited a sample group of older adults and a sample group of younger adults for a…
A: Here, denote, x as the age of an old adults.Compute mean, range, variance, and standard deviation…
Q: The department of education ran a very comprehensive study in the 1990's to determine the GPA of…
A: Hi, since the problem posted by you contains multiple sub-parts, we are answering the first three…
Q: The State Traffic Engineer’s office recorded the number of accidents reported in the state on 40…
A: The median is the middle value in the list of numbers. To find the median, your numbers have to be…
Q: Does it seem to you that people tend to be absent more on some days of the week than on others?…
A: The categorical variable is day of the week. We have to test whether absences by the firm’s…
Q: A researcher is interested in exploring the relationship between calcium intake and weight loss. Two…
A: n1=n2=28 X1-bar=15.2 X2-bar=12.3 S1=2.5 S2=1.9
Q: ccording to a 2006 survey conducted by the Center for Disease Control and Prevention (CDC), birth…
A: Solution: Given information: n= 1380 Sample size k= 12 Categories because there 12 months from…
Q: Recent results suggest that children with ADHD tend to watch more TV than children who are not…
A: Given Information- Sample size, n = 36 Sample mean, x-bar = 4.9 hours Population mean, μ = 4.1…
Q: section 8.2 The mean weight of an adult is 65 kilograms with a standard deviation of 13 kilograms.…
A: The question is about central limit theorem Given : Popl. mean weight of adult ( μ ) = 65 Kg Popl.…
Q: A researcher would like to know whether there is a consistent, predictable relationship between ACT…
A: The summarized frequency distribution table about ACT scores and GPA:HighLowTotalHigh GPA392160Low…
Q: A travel agent is interested in the average price of a hotel room during the summer in a resort…
A: Given Information: Sample size n=16 Sample mean x¯=145 Sample standard deviation s=35
Q: Suppose that we know that 33.8% of the people born in the United States between 1936 and 1951 have…
A:
Q: Solve the problem. Assume that mountain lions' weights are normally distributed with a mean of 62.6…
A: We have given that, X be the random variable from normal distribution with mean (μ) = 62.6 ,…
Q: Life Insurance: A life insurance company wants to estimate the probability that a 40 year old male…
A: According to relative frequency approximation Probability = (No of favorable count / Total no of…
Q: Does it seem to you that people tend to be absent more on some days of the week than on others?…
A: Weekday f0 fE χ2=f0-fE2fE Monday 29 28 0.036 Tuesday 18 28 3.571 Wednesday 34 28 1.286…
Q: Suppose that the value of a stock varies each day from $8.82 to $16.17 with a uniform distribution.…
A: Given that the value of a stock varies each day from $8.82 to $16.17 with a uniform distribution. X…
Q: A young investment manager tells his client that the probability of making a positive return with…
A:
Q: A professor knows that her statistics students' final exam scores have a mean of 79 and a standard…
A:
Q: A physician recorded the number of seizures that each of 20 patients with severe epilepsy had during…
A: Introduction: It is required to identify the observational units and the population being studied.
Q: An ANOVA is used to compare the mean GPA of the following groups of students.
A: Rejection Rule: If the absolute mean difference is greater than HSD(=0.8), then the pairs of…
Q: A sample of 250 employees of a company is selected, and the average age is found to be 35 years.…
A: Given information, A sample of 250 employees of a company is selected, and the average age is found…
In deciding how many customer service representatives to hire and in planning their schedules, it is important for a firm marketing electronic typewriters to study repair times for the machines. Such a study revealed that repair times have approximately an exponential distribution with a
Step by step
Solved in 2 steps
- Water specimens are taken from water used for cooling as it is being discharged from a power plant into a river. It has been determined that as long as the mean temperature of the discharge is at most 150F, there will be no negative effects on the river's ecosystem. To investigage whether the plant is in compliance with regulations that prohibit a mean discharge water temperature above 150F, researchers will take 50 specimens at randomly selected times and record the temperature of each specimen. The resulting data will be used to test the hypotheses:H0:μ≤150FH0:μ≤150F Ha:μ>150FHa:μ>150F.(a) In the context of this problem, describe Type I and Type II errors.Type I Error:Select an answer A Type I error is not obtaining convincing evidence that the mean water temperature is greater than 150F when in fact it is greater than 150F. A Type I error is obtaining convincing evidence that the mean water temperature is greater than 150F when in fact it is at most 150F. Type II…Suppose the manager agrees to pay each employee a $50 bonus if they meet a certain goal. On a typical Saturday, the oil change facility will perform 40 oil changes between 10 AM and 12PM. Treating this as a random sample, there would be a 10% chance of the mean oil change time being at or below what value.The 2012 National Survey on Drug Use and Health estimated that 25% of canadians agd 12 or over reported binge drinking in the past month. Find the odds of binge drinking
- Liu et al. (2015) recently reported the results of a study examining whether happy people live longer. The study followed a large sample of British women, aged 50 to 69, over a 10-year period. At the beginning of the study, the women were asked several questions including how often they felt happy. After 10 years, roughly 4% of the women had died. The following table shows a frequency distribution similar to the results obtained in the study. Lived Died Within 10 Years Total Happy Most of the Time 382 18 400 Unhappy Most of the Time 194 6 200 Total 576 24 n = 600 Do the data indicate a significant relationship between living longer and being happy most of the time? Test with α = .05. (Round your answers to two decimal places for χ²-critical and χ².) χ²-critical = χ² = Conclusion: Fail to reject the null hypothesis. There is a relationship between living longer and being happy most of the time. Reject the null hypothesis. There is no relationship between living longer and being…Cody took his first physics exam and scored an 80. The population mean for this exam is 70, and the standard deviation is 5. What is the probability of selecting a person with a score greater than Cody’s?A recent Gallup Poll interviewed a random sample of 1523 adults. Of these, 868 bought a lottery tickets in the past year. Suppose that in fact (unknown to Gallup) exactly 60% of all adults bought a lottery ticket in the past year. If Gallup took many simple random samples of 1,523 people, the sample proportion who bought a ticket would vary from sample to sample. The sampling distribution would be close to normal with a mean of 0.6 and a standard deviation of___ A)0.4899 B)0.0251 C)0.00016 D)0.0126
- Does it seem to you that people tend to be absent more on some days of the week than on others? Recently, a major biotechnology firm collected data with the hope of determining whether or not its employees were more likely to be absent on some weekdays than on others. The firm examined a random sample of 130 employee absences. The distribution of these 130 absences is shown in the table below. The observed frequency for each category (each weekday) is shown in the first row of numbers. The second row of numbers contains the frequencies expected for a sample of 130 employees if employee absences at the firm are equally likely on each of the five weekdays. The bottom row of numbers contains the following value for each of the categories.According to a 2006 survey conducted by the Center for Disease Control and Prevention (CDC), birth rates peak slightly between July and October each year. While a slight numerical increase in birth rates is often observed, this difference is assumed to be statistically non-significant. Thus, we would expect to see an equal number of people born during each month of the year in the United States. The "Birth Data.jasp" contains the birth months for 1380 babies (N = 1380) born during the year 2006 in the United States collected by the CDC. Conduct a Chi-Square Goodness of Fit Test at α = 0.05, to see if the number of babies born each month “fits” with the CDC’s assumptions about the population. Identify the correct null hypothesis. A. H0: The number of babies born throughout the year is equal across all 12 months B. H0: The number of babies born during the summer months is greater than the number of babies born during the rest of the year C. HA: The number of babies born in…A researcher who studies mental health is interested in the length of time (in days) that a patient stays in the hospital after they have presented to emergency having suicidal ideation. The researcher follows the first 30 patients during the month of January and follows them until each one of them is released. Below is the histogram of the data obtained from the 30 patients. 1. What is the shape of this distribution and please construct a frequency table. Given the shape and type of data, which measure of central tendency would you be more likely to report? Why?
- A psychologist believes that 65% of male drivers when lost continue to drive hoping to find the location they seek rather than ask directions. To examine this belief, he took a random sample of 350 male drivers and asked each what they did when lost. Assume that the sampling distribution of the sample proportion of male drivers who continue driving is at least approximately normal. If the belief is true, determine the probability that less than 60% said they continue driving. Show your work belowThe National Football League (NFL) records a variety of performance data for individuals and teams. To investigate the importance of passing on the percentage of games won by a team, the following data show the average number of passing yards per attempt (Yds/Att) and the percentage of games won (WinPct) for a random sample of 10 NFL teams for the 2011 season (NFL website). Team Yds/Att WinPct 5.7 26 Arizona Cardinals Atlanta Falcons Carolina Panthers 7.6 67 7.3 52 6.9 51 Chicago Bears Dallas Cowboys 5.1 17 8.6 82 New England Patriots Philadelphia Eagles Seattle Seahawks 5.3 21 6.6 41 St. Louis Rams 6.5 41 Tampa Bay Buccaneers. 6.1 38 a. Choose the correct a scatter diagram with the number of passing yards per attempt on the horizontal axis and the percentage of games won on the vertical axis. B. A. WinPct WinPct 80 DD J F1 70- 60- 50+ -40- 30 20- F2 80 F3 000 000 F4 F5 80- -70 60- 50- 40- 30- 20- S F6 ● - F7 DII F8 F9 F10 () F11 <))) F12 AHistorically it has been observed that patients admitted to a certain hospital for treatment of influenza spend a MEAN length of 4.4 days in the hospital. Every flu season, different strains of the flu circulate: Some years the primary strain causes more severe illness (and presumably longer than average hospital stays) and other years less so (meaning presumably shorter than average stays). We assume the hospital stays are NORMALLY distributed. a. A hospital wants to see how this year's flu season compares to previous years. Therefore, state the null and alternate hypotheses that would be used to test whether the hospital is seeing a mean hospital stay that is significantly DIFFERENT than the historical mean of 4.4 days. b. FIFTEEN patients admitted for influenza treatment are then randomly sampled and the length of their hospital stay in days is given below. 4641056443743774 SAMPLE MEAN =? SAMPLE STANDARD DEVIATION =? c. Using the results of part (b), determine what type of test is…
