Question

1. For a population mean, it is equal to the product of the critical value and the _______________ of the mean when two conditions are met: the sample is __________ and either the population is normally distributed or the sample size is at least ________.

Answer 1

Solution:

Answer is as

For a population mean, it is equal to the product of the critical value and the standard error of the mean when two conditions are met: the sample is random and either the population is normally distributed or the sample size is at least 30

Explanation:

For estimating the population mean ,

Margin of error = Critical z value * Standard error

The sampling distribution of mean approximately normal if either the population is normally distributed or the sample size is at least 30