A random sample of 100 students is taken from a larger population of students in a multi-lecture course and the sample mean (average) of their final grades is found to be 62.25. Suppose it is known that the population standard deviation is 3.2. You wish to create a 98% confidence interval. Which of the following statements is most correct?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
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A random sample of 100 students is taken from a larger population of students in a multi-lecture course and the sample mean (average) of their final grades is found to be 62.25. Suppose it is known that the population standard deviation is 3.2. You wish to create a 98% confidence interval. Which of the following statements is most correct?

a.

The zα/2 (found from R) used to calculate the 98% confidence interval is 2.053749.

b.

The zα/2 (found from R) used to calculate the 98% confidence interval is 0.01.

c.

The zα/2 (found from R) used to calculate the 98% confidence interval is 2.326348.

d.

The zα/2 (found from R) used to calculate the 98% confidence interval is 2.575829.

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