Question

which of the following is NOT a requirement of constructing a confidence interval estimate for a population variance?

1- The sample is a simple random sample.

2- The pipulation must be skewed to the right

3- The population must have normally distributed values

4- A histogram of the data must be bell-shaped

Answer 1

In order to find the confidence interval we must want the sample is a simple random sample(SRS).

For finding the confidence interval for population variance we should have the population with values normally distributed.

As the population is normally distributed and the sample is a random sample so the histogram of the data must be bell shaped.

As population must have normally distributed values so it must not skewed to the right.

Therefore, 2nd option is wrong.