Answer 0.3413 0.8413 0.1587 0.5000 Question 37 Exhibit 2-1 The numbers of hours worked (per week) by 400 statistics students are shown below. Number of hours Frequency 0 – 9 20 10 – 19 80 20 – 29 200 30 – 39 100 Refer to Exhibit 2-1. The percentage of students who work at least 10 hours per week is Answer 50% 5% 95% 100% Question 38 A newspaper wants to estimate the proportion of Americans who will vote for Candidate A. A random sample of 1000 voters is taken. Of the 1000 respondents, 526 say that they will vote for Candidate A. Which Excel function would be used to construct a confidence interval estimate? Answer NORMSINV NORMINV TINV INT Question 39 Exhibit 12-2 You are given the following information about y and x. y x Dependent Independent Variable Variable 5 15 7 12 9 10 11 7 Refer to Exhibit 12-2. The least squares estimate of b0 equals Answer -7.647 -1.3 21.4 16.41176 Question 40 From a population of 200 elements, the standard deviation is known to be 14. A sample of 49 elements is selected. It is determined that the sample mean is 56. The standard error of the mean is Answer 3 2 greater than 2 less than 2