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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

Respuesta :

Answer:

c or b

Step-by-step explanation:

MathPhys

Answer:

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

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