quiz 4.docx - Part 1 of 3 11.0 11.0 Points Question 1 of 20...

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Part 1 of 3 - 11.0/ 11.0 Points Question 1 of 201.0/ 1.0 PointsThe form of the alternative hypothesis can be:A. neither one nor two-tailed B. one-tailed C. one or two-tailed D. two-tailed
Answer Key: C
Question 2 of 201.0/ 1.0 PointsSuppose that the mean time for a certain car to go from 0 to 60 miles per hour was 7.7 seconds. Supposethat 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 3 of 201.0/ 1.0 PointsIn 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.Compute the z or t value of the sample test statistic.
Question 4 of 201.0/ 1.0 PointsA manufacturer of flashlight batteries took a sample of 13 batteries from a day’s production and used them continuously until they failed to work. The life lengths of the batteries, in hours, until they failed were: 342, 426, 317, 545, 264, 451, 1049, 631, 512, 266, 492, 562, and 298. At the .05 level of significance, is there evidence to suggest that the mean life length of the batteries produced by this manufacturer is more than 400 hours?
Question 5 of 201.0/ 1.0 PointsResults 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. 0.4874
B. 0.7563 C. 0.2437 D. 0.6874 Answer Key: C

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