Quiz 4 - Part 1 of 3 Question 1 of 20 10.0 11.0 Points 1.0...

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Part 1 of 3 -10.0/ 11.0 PointsQuestion 1 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?A.No, because the test value 1.257 is greater than the critical value 1.115B.Yes, because the test value 1.257 is less than the critical value 1.782C.No, because the p-value for this test is equal to .1164D.Yes, because the test value 1.257 is less than the critical value 2.179Answer Key: C
Question 2 of 201.0/ 1.0 PointsThe null and alternative hypotheses divide all possibilities into:
Question 3 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.
State the null and alternative hypotheses.A.H0: p .79, H1: p > .79B.H0: = .79, H1: > .79C.H0: p = .79, H1: p ≠ .79
Question 4 of 201.0/ 1.0 PointsYou conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of H0. You calculate a p-value of 0.0667. What will happen to the p-value if you observe the same sample mean and standard deviation for a sample size larger than 25?
Question 5 of 201.0/ 1.0 PointsIn an article appearing in Today’s Healtha 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. A.t = 1.916
B.z = 1.916C.z = 1.645D.t = -1.916Answer Key: A

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