How many degrees of freedom does your sample contain?

Pick the Test (Z-test, Single Sample T-test, Independent Sample T-test, Paired Sample Ttest, ANOVA):   It is frequently reported that men do better on mental rotation tasks (a measure of spatial ability) than women. You want to make sure that the gender difference in mental rotation is not due to gender differences in athletic ability and experience. You get 30 men and 30 women and match them up for equivalent athletic ability and experience. Then you give each group a mental rotation task and compare the results of the men to the women. Test: ___________________

Z-Test or T-Test For this assignment, you will review two different situations that both involve comparing a sample to a population. Consider the information available for each situation, choose the correct test, and use the data to conduct it. A researcher wants to compare the email use of the employees at one company to the corresponding population. Data is collected on the number of emails received by the company's employees. It will be necessary to use this sample data, as well as population data to determine if there is a significant difference between both. Population Mean number of emails: 30 Standard deviation: 4 Sample Mean number of emails: 33 Total employees: 100 A researcher wants to compare the number of vehicles owned by families in one location to the larger population. Data is collected on the number of vehicles owned by each family. It will be necessary to use this sample data, as well as population data to determine if there is a significant difference between…

How can I find the sample mean of these four scores ? 1,4,4,10