Use the given information to find the minimum sample size required to estimate an unknown population mean.

Margin of error: $120, confidence level: 95%, standard deviation=$593

A) 83

B) 66

C) 94

D) 133

c or b

C) 94

Step-by-step explanation:

Margin of error = critical value * standard error

ME = CV * SE

Assuming n > 30, we can approximate CV with a normal distribution. At P = 95%, CV = 1.96.

SE = σ / √n

SE = 593 / √n

Therefore:

120 = 1.96 * 593 / √n

n = 94