To become an actuary, it is necessary to pass a series of 10 exams, including th

Question

To become an actuary, it is necessary to pass a series of 10 exams, including the most important one, an exam in probability and statistics. An insurance company wants to estimate the mean score on this exam for actuarial students who have enrolled in a special study program. They take a sample of 8 actuarial students in this program and find the mean of the sample is 6.0 with standard deviation of the sample 2.0. This sample will be used to calculate a 95% confidence interval for the mean score for actuarial students in the special study program. The confidence interval will be based on ________ degrees of freedom.

Question 15 options:

1)

2)

3)

4)

1)

2)

3)

4)

Explanation / Answer

Number of degrees of freedom = Sample size - 1

Since the sample size contains 8 entries with mean equal to 6 and variance equal to 2

Hence number of degree of freedom = 8 - 1 = 7

Therefore the correct answer is Option A

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