It is known that the population variance equals 484. With a 0.95 probability, calculate the sample size that needs to be taken to estimate the population mean if the desired margin of error is 5 or less?
What is Pbar and how do we determine it's value?
Is the variance information we don't need?

The sample size is 74

Pbar = 0.05

The variance information is needed

Step-by-step explanation:

The population variance ,

Confidence Interval level = 95% = 0.95

Significance Interval = 1 - CI

Significance Interval = 1 - 0.95 = 0.05

Error margin = 5

The critical value = = 1.96 (From the z table)

The sample size is given by:

Since P = 0.95

The variance information is needed in this question when calculating the sample size

your answer is a

step-by-step explanation:

4*4*4*4=256

27

step-by-step explanation: