Statistical Inferences Answers

A simple random sample is drawn from a normally distributed population. The value of which of the following will not be known for certain but can be inferred?

What is the z-score with a confidence level of 95% when finding the margin of error for the mean of a normally distributed population from a sample?

Which of the following conditions must be met in order to make a statistical inference about a population based on a sample if the sample does not come from a normally distributed population?

Suppose the mean of a normally distributed population is 300, and 200 simple random samples are drawn from the population. At a 68% confidence level, (one standard deviation from the mean), about how many of the samples’ confidence intervals would you expect to contain the population mean?