1. [-11 Points] DETAILS MENDSTATCZ 10.MC.032. MY NOTES ASK YOUR TEACHER If you were constructing a 99% confidence interval of the population mean based on a sample of n = 25 where the standard deviation of the sample 5 = 0.05, the critical value of twill be: a. 02.3562 0. 02.7374 c. 02.7969 d. 02.4851 e. 02.4922 Need Help? _ 2. [-11 Points] DETAILS MENDSTATCZ 10.MC.031. MY NOTES ASK YOUR TEACHER Researchers determine that 60 Kleenex tissues is the average number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded the following statistics on the number of tissues used during a cold: E = 52 and s = 22. Using the sample information provided, the value of the test statistic is a. 01 = (52 - sci/(22710) b. 0 c = (52 - 50)/(22/100) c. O r = (52 - sown/102) d. Or = (52 - 60)](22/1002) e. O: = (52 - 60)]22 Need Help? 3. [-11 Points] DETAILS MENDSTATCZ 10.MC.030. MY NOTES ASK YOUR TEACHER Private colleges and universities rely on money contributed by individuals and corporations for their operating expenses. Much of this money is put into a fund called an endowment, and the college spends only the interest earned by the fund. A recent survey of 8 private colleges in the United States revealed the following endowments (in millions of dollars): 60.2, 47.0, 235.1, 490.0, 122.6, 177.5, 95.4, and 220.0. Summary statistics yield )7 : 180.975 and s = 143.042. A 95% condence interval for the mean endowment of all the private colleges in the United States is: a. 0180.975 :t 119.605 millions of dollars b. 0180.975 2 94.066 millions of dollars c. 0180.975 i 99.123 millions of dollars d. 0180.975 1 116.621 millions of dollars a. 0180.975 1 116.983 millions of dollars Need Help? 4. [-11 Points] DETAILS MENDSTATCZ 10.MC.029. MY NOTES ASK YOUR TEACHER A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: )7 = $50.50 and 52 = 400. A 95% condence interval for the average amount the credit card customers spent on their first visit to the chain's new store in the mall is: a. 0$50.50 a $11.79 0. 0:50.50 s $11.00 c. Ossoso :l: $9.09 d. Ossosu 1 $11.06 e. Ossoso e $10.12 Need Help? 5. [-11 Points] DETAILS MENDSTATCZ 1 0.MC.027. MY NOTES ASK YOUR TEACHER Which of the following is not true about the Student's 1' distribution? a. on has more area in the tails and less in the center than does the normal distribution. 0. Olt is used to construct condence intervals for the population mean when the population standard deviation is known. c. on is bell shaped and symmetrical. d. OAs the number of degrees of freedom increases, the 1' distribution approaches the normal distribution. e. Oboth (a) and (b)