# Question 7 of 20 00 10 points results from previous

• Test Prep
• 10
• 97% (76) 74 out of 76 people found this document helpful

This preview shows page 3 - 6 out of 10 pages.

Question 7 of 20 0.0/ 1.0 Points Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance. State the null and alternative hypotheses. A.H 0 : p = .79, H 1 : p ≠ .79 B. 0 : = .79, H 1 : > .79 C.H 0 : = .79, H 1 : > .79
D.H 0 : p .79, H 1 : p > .79 Answer Key: D Question 8 of 20 0.0/ 1.0 Points In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 with a sample standard deviation of 7. At the = .05 level of significance, does the nutritionist have enough evidence to reject the writer’s claim?
Question 9 of 20 1.0/ 1.0 Points Suppose that the mean time for a certain car to go from 0 to 60 miles per hour was 7.7 seconds. Suppose that you want to test the claim that the average time to accelerate from 0 to 60 miles per hour is longer than 7.7 seconds. What would you use for the alternative hypothesis?
Question 10 of 20 1.0/ 1.0 Points
A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample. The target accuracy is a variance in measurements of 1.2 or less. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2.2, does this provide enough evidence to reject the claim that the lab technician’s accuracy is within the target accuracy?
Question 11 of 20 1.0/ 1.0 Points Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance. What is the p-value associated with your test of hypothesis? A.0.2437 B.0.4874 C.0.7563 D.0.6874 Answer Key: A
Part 2 of 3 - 4.0/ 6.0 Points