Question

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

Answer 1

c or b

Explanation:

Answer 2

C) 94

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