Your statistics instructor wants you to determine a confidence interval estimate for the mean test score. Past experience indicated that tests scores are normally distributed with a sample mean of 160 and a population standard deviation of 45. The critical value to estimate a 95% confidence interval of the population means is A. 1.645 B. 1.96

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QUESTION 7
Your statistics instructor wants you to determine a
confidence interval estimate for the mean test score.
Past experience indicated that tests scores are
normally distributed with a sample mean of 160 and a
population standard deviation of 45. The critical value
to estimate a 95% confidence interval of the population
means is
A. 1.645
B. 1.96
OC. 2.021
D. 1.684
Transcribed Image Text:QUESTION 7 Your statistics instructor wants you to determine a confidence interval estimate for the mean test score. Past experience indicated that tests scores are normally distributed with a sample mean of 160 and a population standard deviation of 45. The critical value to estimate a 95% confidence interval of the population means is A. 1.645 B. 1.96 OC. 2.021 D. 1.684
Expert Solution
Step 1

Given Information:

Sample mean x¯=160

Population standard deviation σ=45

Confidence level is 95%

Significance level α=1-0.95=0.05

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