Question

Asked Nov 16, 2019

21 views

Step 1

Given:

Standard deviation = σ = 9

Margin of error = 2

To find sample size for given confidence level.

Step 2

For 95%,

First need to find z for 95%.

P(Z≤z) = 0.95

Using standard normal table,

Z = 1.96

Formula to find sample size is,

Step 3

For 99%,

First need to find z for 995%.

P(Z≤z) = 0.99

Usi...

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