Question: Should I be using the confidence interval formula to solve. Ive tried several times and cant seem to figure it out. Thank you Suppose that

Should I be using the confidence interval formula to solve. Ive tried several times and cant seem to figure it out. Thank you

Suppose that for a sample size of n=144, we find that the sample mean is 48. Assuming that the standard deviation = 7, calculate the confidence intervals for the population meanwith the following confidence levels.

a. 90%

b. 92%

c. 95%

d. 97%

e. 99%

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