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A study found that the average time it took a person to find a new job...

A study found that the average time it took a person to find a new job was 3.5 months. If a sample of 30 job seekers was surveyed, find the 90% confidence interval of the mean. Assume the standard deviation of the sample is 0.5 month.

a. 1.8 μ< 3.2

b. 2.4 μ< 2.6

c. 3.3 μ< 3.7

d. 5.6 μ< 6.2

math   Statistics-And-Probability   
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