10.  Do students sleep more in Pennsylvania or in California? A study was designed to estimate the difference in the number of hours students sleep per night and the summary statistics for the following two universities is given below: Penn State University:       n=190       sample mean = 7.17       s = 1.95 University of California, Davis:       n=173       sample mean = 6.83       s = 1.71 Construct and interpret a 90% confidence interval for the difference between the population mean number of hours students sleep per night of Penn State University students and University of California, Davis students. (c) What is the upper bound of the 90% confidence interval?

8.  Time magazine reported in a 2004 survey of 507 randomly selected adult American Catholics, that 279 answered yes to the question “Do you favor allowing women to be priests?”   Construct and interpret a 90% confidence interval for the population proportion of adult American Catholics who favor allowing women to be priests. (f)  Interpret the 90% confidence interval for the population proportion of adult American Catholics who favor allowing women to be priests.

8.  Time magazine reported in a 2004 survey of 507 randomly selected adult American Catholics, that 279 answered yes to the question “Do you favor allowing women to be priests?”   Construct and interpret a 90% confidence interval for the population proportion of adult American Catholics who favor allowing women to be priests. (a) What is the sample proportion (p-hat) for the confidence interval?

9.  Do students sleep more in Pennsylvania or in California? A study was designed to estimate the difference in the number of hours students sleep per night and the summary statistics for the following two universities is given below: Penn State University:       n=190       sample mean = 7.17       s = 1.95 University of California, Davis:       n=173       sample mean = 6.83       s = 1.71 Does the data show that the mean number of hours that Penn State University students sleep per night is significantly different from the mean number of hours that University of California, Davis students sleep per night?  (While answering the following sub-parts of this question, you will be including the null and alternative hypothesis, the test statistic, the p-value (a visualization and an interpretation), your statistical decision, and your conclusion in the context of the problem.) (b) What type of statistical test should be used for this situation?

8.  Time magazine reported in a 2004 survey of 507 randomly selected adult American Catholics, that 279 answered yes to the question “Do you favor allowing women to be priests?”   Construct and interpret a 90% confidence interval for the population proportion of adult American Catholics who favor allowing women to be priests. (f)  Interpret the 90% confidence interval for the population proportion of adult American Catholics who favor allowing women to be priests.

6.  The following are Blood Alcohol Contents (BAC’s) of a random sample of drivers arrested last New Years Eve in Gainesville by the Florida Highway Patrol (FHP):  0.09, 0.11, 0.14, 0.25, 0.09, 0.20, 0.10.  Assume that the population of BAC’s is normally distributed.  Find and interpret a 95% confidence interval for the mean BAC of drivers arrested on New Year’s Eve in Gainesville by the FHP.  (h) Interpret the 95% confidence interval for the population mean BAC of drivers arrested on New Year’s Eve in Gainesville by the FHP.

2. Describe what s2 measures (using words rather than a formula).  Please use a complete sentence. 

1. (a) What is a statistic?

5. A professor at Santa Fe College for STA2023 collected data from one of her classes in the Fall of 2017 to investigate the relationship between study time per week (average number of hours) and college GPA. The data for males in her class is given below: Study hours per week 5 6 10 12 13 15 21 25 GPA (grade point average) 2.7 3.0 3.1 3.3 3.2 3.4 3.8 3.6 Find the equation of the regression line using the least squares approach.  You may use the appropriate procedure in your calculator to help you find the solution.  Clearly label, the slope, the y-intercept and the regression equation. (a) What is the slope?

Variables that follow, or trail, changes in overall economic activity; such as interest rates and duration of unemployment