Do male and female servers work the same number of hours? A sample of 29 female servers worked an average of 23 hours per week, with a standard deviation of 4. A sample of 16 male servers worked an average of 24 hours per week, with a standard deviation of 2. Construct a 95% confidence interval for the mean difference in hours worked for male and female servers. You may assume that the populations are normal.- Lower bound on CI = [Input Box] (use two decimal places)- Upper bound on CI = [Input Box] (use two decimal places)

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Answered: Do male and female servers work the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Similar questions

A student researcher compares the heights of American students and non-American students from the student body of a certain college in order to estimate the difference in their mean heights. A random sample of 1212 American students had a mean height of 68.468.4 inches with a standard deviation of 2.462.46 inches. A random sample of 1717 non-American students had a mean height of 65.165.1 inches with a standard deviation of 2.962.96 inches. Determine the 98%98% confidence interval for the true mean difference between the mean height of the American students and the mean height of the non-American students. Assume that the population variances are equal and that the two populations are normally distributed. Step 2 of 3: Find the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.
The mean age when people got married for the first time in the year 2000 was 26 years old with a population standard deviation of 6 years. A researcher thinks that marriage age has significantly changed since then. A survey of married persons of this generation was done to see if the mean age has changed. The sample of 50 married persons found that their mean age of first marriage was 27.7 years old. Do the data support the claim at the 10% significance level? What are the correct hypotheses? H0: yearsHa: years Based on the hypotheses, find the following: Test Statistic z = (Give answer to at least 4 decimal places) P-Value= (Give answer to at least 4 decimal places)
A firm is looking to employ a person as an engineer. Applicants of earlier years have standart deviation of 35.8. we pick random 75 people who apply to job this year and their mean result of the exam is 167.5. What is the 90 percent confidince interval for the mean of all applicants exam results?
Researchers are interested in the effect of pet companionship on depression in elderly adults. They randomly select 25 participants from the target population and record their depression scores before and after spending a month with a dog (a higher score indicates a higher level of depression). The researchers then compute the difference scores for each participant (difference after before). The mean of differences is - 1 and the standard deviation of differences is 2. Can the researchers conclude that there is an effect of pet companionship on depression in elderly adults? Conduct the appropriate statistical test (two-tailed) with a = .05. Based on the information provided above, which statistical test seems most appropriate? one sample t test O z test independent samples t test O dependent samples t test
Lake Quanipaug in Connecticut is famous for its yellow perch. Studies have found that the national mean length is µ = 8.2 inches. However, a random sample of 31 fish caught during Memorial weekend at Lake Quanipaug, had a sample mean of x̄=7.1 inches, with an estimated sample standard deviation of s = 3.8 inches. Do these current data indicate that the average length of the yellow caught at Lake Quanipaug is less than historical µ = 8.2 inches? Use α = .02. State α, Ho, H1, p-value, rejection, or non-rejection, and be certain to interpret your results.
20 TV remote controls were followed over the years to find the mean lifespan of this model. The sample gave a mean of 7.2 years, and the standard deviation of 0.6 years. The distribution of the population is unknown. Construct a 90% confidence interval for the mean lifespan of these remote controls.
In a study of 110 women and 116 men, it was found that mean body temperature for women was 97.690 F and mean body temperature for men was 97.450 F. Assume that the populations are independent, and the standard deviations were found to to be 0.89o F for women, and 0.660 F for men. Use an α = 0.05 significance level to test the claim that woman and men have different mean body temperatures. For full credit your hypothesis test must include: the claim, the null and alternate hypothesis, your test statistic and corresponding p-value, your decision, and the interpretation of your decision as it relates to the claim. It is acceptable to use technology to calculate the test statistic and the p-value here.
A group of adult males has foot lengths with a mean of 26.79 cm and a standard deviation of 1.27 cm. Use the range rule of thumb for identifying significant identify the limits separating values that are significantly low or significantly highIs the adult male foot length of 29.7 cm significantly low or significantly highExplain A random sample of 10 subjects have weights with a standard deviation of 14.0120 kgWhat is the variance of their weights? Be sure to include the appropriate u with the result The variance of the sample data is
A number of 28 university students who smokes completed a questionnaire inquiring their smoking history and behavior. The result shows that the average smoking initiation age of this group is 21.6 years with a variance of 18.49. Based on past record, the smoking initiation age of university student has a mean of 20.74 years with a standard deviation of 5.1 years. Conduct a necessary analysis to determine if the smoking initiation age remain the same as the previous record. Use 4% level of significance.
Researchers are interested in the effect of pet companionship on depression in elderly adults. They randomly select 25 participants from the target population and record their depression scores before and after spending a month with a dog (a higher score indicates a higher level of depression). The researchers then compute the difference scores for each participant (difference after before). The mean of differences is -1 and the standard deviation of differences is 2. Can the researchers conclude that there is an effect of pet companionship on depression in elderly adults? Conduct the appropriate statistical test (two-tailed) with a = .05. Should you reject or fail to reject the null hypothesis? Reject O Fail to reject
The mean of the commute time to work for a resident of a certain city is 27.3 minutes. Assume that the standard deviation of the commute time is 7.1 minutes. What minimum percentage of commuters in the city has a commute time within 2.5 standard deviations of the mean? What are the commute times within 2.5 standard deviations of the mean?
Consumer agencies claim that the mean lifespan of a dishwasher is 9.5 years. Your company manufacturers dishwasher and you have been asked to see if this claim is true. You randomly survey 20 households who have recently purchased a dishwasher and ask them how long their previous dishwashers lasted and you calculate a mean of 8.9 years with a standard deviation of 3.1. Is the consumer agency’s claim that a dishwasher lasts 9.5 year correct? What is the p-value for this claim? Consumer agencies claim that the mean lifespan of a dishwasher is 9.5 years. Your company manufacturers dishwasher and you have been asked to see if this claim is true. You randomly survey 20 households who have recently purchased a dishwasher and ask them how long their previous dishwashers lasted and you calculate a mean of 8.9 years with a standard deviation of 3.1. Is the consumer agency’s claim that a dishwasher lasts 9.5 year correct? What is the p-value for this claim? 0.8012 0.1988 0.3975 -0.8656

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