A vertical line drawn through a normal distribution at z = +2.11 separates the distribution into two sections, the body and the tail. What proportion of the distribution is in the tail?

A population is the set of all individuals of interest in a particular study.

What is the variance for the following population of scores? Scores: 2, 5, 6, 3

What proportion of a normal distribution is located in the tail above z = +1.50?

For a population with µ = 100 and

For a normal population with µ = 60 and

For a one-tailed hypothesis test with  

To calculate the variance for a sample, SS is divided by the appropriate degrees of freedom.

What is the mean average for the following set of quiz scores? Scores: 4, 5, 9, 2, 3, 7

A sample of n = 9 college students is used to evaluate the effectiveness of a new Study Skills Workshop. Each student’s grade point average (GPA) is recorded for the semester before the workshop and for the semester after the workshop. The average GPA improved by MD = 0.60 points with s2 = 0.09. The researcher would like to use the sample to estimate how much effect the workshop would have for the entire college population. Which of the following is the 80% confidence interval for these data?