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Question: A high school counselor wanted to know if tenth-graders at her high school tend to have more free time than the twelfth-graders. She took random samples of 25 tenth-graders and 23 twelfth-graders. Each student was asked to record the amount of free time he or she had in a typical week. The mean for the tenthgraders was found to be 29 hours of free time per week with a standard deviation of 7.0 hours. For the twelfthgraders, the mean was 22 hours of free time per week with a standard deviation of 6.2 hours. Assume that the two populations are normally distributed with equal but unknown population standard deviations.
a. Make a 90% confidence interval for the difference between the corresponding population means.
b. Test at the 5% significance level whether the two population means are different.
Given the following data on hotel check-ins for a 6-month period:
a businessweek north american subscriber study collected data from a sample of 2861 subscribers. fifty-nine percent of
Use a formula to calculate a total for each month of expenses. Beside the column add another column for calculating the percent of the budget for each expense category.
1.a researcher wanted to know if the content of television programs has an impact on viewers recall of ad content. he
Students revealed and average cost of books of $370 per student. The Dean of Students believes that cost are greater this semester. What is the test value for this hypothesis?
let x denote the length in minutes of a long-distance telephone conversation. assume that the density for x is given by
What is the shape of the histogram given for the variable Dad's Height? Are there any outliers?- Based on the shape of the histogram, explain whether or not the Empirical Rule will apply.
you wish to test the claim that u gt 11 at a level of significance of ? 0.05 and are given sample statistics n 50
A portfolio contains 16 independent risks, each with a gamma distribution with parameters a = 1and () = 250. Give an expression using the incomplete gamma.
Estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 2 percentage points.
Julio works as a quality control expert in a beverage factory. The assembly line that he monitors produces about 20,000 bottles in a 24-hour period.
What is the most likely monetary outcome of the business venture?- Is the venture likely to be successful?- What is the long-term average earning of business ventures of this kind? Explain.
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