An elementary school teacher is interested in determining if stress affects spelling performance. Ten students are...
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"]
Homework Answers
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