11. The owner of a large car dealership believes that the finandial crisis decreased the number of customers visiting her dealership. The dealership has historically had 800 austomers per day. The...

Extracted text: 11. The owner of a large car dealership believes that the finandial crisis decreased the number of customers visiting her dealership. The dealership has historically had 800 austomers per day. The owner takes a sample of 100 days and finds the average number of customers visiting the dealership per day was 750. Assume that the population standard deviation is350. The value of the test statistic is A. Z=-1.429 B. t99 =-1.429 C. z 1.429 D. tog 1.429 12. The Institute of Education Sciences measures the high school dropout rate as the percentage of 16- through 24-year-olds who are not enrolled in school and have not earned a high school credential. Last year, the high school dropout rate was8,1%. A polling company recently took a survey of 1,000 people between the ages of 16 and 24 and found that 6.5% of them are high school dropouts, The polling company would like to determine whether the dropout rate has decreased. At a 5% significance level, the decision is to A. reject Ho, we can conclude that the high school dropout rate has decreased B. reject Ho, we cannot conclude that the high school dropout rate has decreased C. do not reject Ho, we can condude that the high school dropout rate has decreased D. do not reject Ho, we cannot conclude that the high school dropout rate has decreased 13. An advertisement for a popular weight-loss dinic suggests that participants in its new diet program lose, on average, more than 10 pounds. A consumer activist decides to test the authenticity of the claim. She follows the progress of 18 women who recently joined the weight-reduction program. She calculates the mean weight loss of these participants as 10.8 pounds with a standard deviation of 2.4 pounds. The test statistic for this hypothesis would be A. 1.41 B. -1,41 C. 1.74 D. -1.74