Question

An elementary school teacher is interested in determining if stress affects spelling performance. Ten students are randomly sampled for an experiment and randomly divided into two groups. One of the groups is subjected to moderate stress for two hours before the test while the other group stays for two hours in a relatively stress free environment. The teacher measures the number of correctly spelled words on a 30 item spelling test. The following data are obtained.

Moderate Stress Condition : 18 25 17 20 23

Stress Free Condition:   20 23 26 30 28

The degrees of freedom for this study are                            [ Select ]                       ["4", "9", "8", "3", "2.262", "2.603", "2.626", "2.306", "2.06", "-2.07", "0.29", "2.16", "reject the null hypothesis", "fail to reject the null hypothesis", "stress affects spelling performance", "cannot conclude that stress affects spelling performance"]         

The critical value for this study using a two tailed alpha level of .05 is                             [ Select ]                       ["4", "9", "8", "3", "2.262", "2.603", "2.626", "2.306", "2.06", "-2.07", "0.29", "2.16", "reject the null hypothesis", "fail to reject the null hypothesis", "stress affects spelling performance", "cannot conclude that stress affects spelling performance"]      

The obtained value of the appropriate statistics is                            [ Select ]                       ["4", "9", "8", "3", "2.262", "2.603", "2.626", "2.306", "2.06", "-2.07", "0.29", "2.16", "reject the null hypothesis", "fail to reject the null hypothesis", "stress affects spelling performance", "cannot conclude that stress affects spelling performance"]         

What is your decision concerning the null hypothesis?                              [ Select ]                       ["4", "9", "8", "3", "2.262", "2.603", "2.626", "2.306", "2.06", "-2.07", "0.29", "2.16", "reject the null hypothesis", "fail to reject the null hypothesis", "stress affects spelling performance", "cannot conclude that stress affects spelling performance"]         

What do you conclude about the affects of stress on spelling performance?                             [ Select ]                       ["4", "9", "8", "3", "2.262", "2.603", "2.626", "2.306", "2.06", "-2.07", "0.29", "2.16", "reject the null hypothesis", "fail to reject the null hypothesis", "stress affects spelling performance", "cannot conclude that stress affects spelling performance"]         

Answer 1