If we take many samples, the sample means x varies from sample to sample according to a Normal distribution with a mean equal to the unknown mean score ? in the population.
What is the standard deviation of this sampling distribution?

Fill in the blank:

2.According to the 95 part of the 68-95-99.7 rule, 95% of all values of x fall within ____ on either side of the unknown mean ?.
What is the missing number?

3.Fill in the blank

The 95% confidence interval for the population mean score? based on this one sample is between ____ and ____.

4. (15.03) The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students