1.A professor of women's studies is interested in determining if stress affects the menstrual cycle. Ten women are randomly sampled for an experiment and randomly divided into two groups. One of the groups is subjected to high stress for two months while the other lives in a relatively stress-free environment. The professor measures the menstrual cycle (in days) of each woman during the second month. The following data are obtained. Using= 0.05_{2 tail}, response to the questions below.

High Stress	Stress Free
20	26
23	31
18	25
19	26
22	30

Indicate your H₁ [ Select ] ["stress does not affects the menstrual cycle", "stress decreases the menstrual cycle", "stress affects the menstrual cycle", "stress increase the menstrual cycle"]

Indicate you H₀ [ Select ] ["stress affects the menstrual cycle", "stress decreases the menstrual cycle", "stress does not affects the menstrual cycle", "stress increase the menstrual cycle"]

What test are you doing? [ Select ] ["single sample z test", "independent group t test", "paired group t test", "single sample t test"]

What is the obtained statistics? [ Select ] ["-4.71", "-3.05", "-4.73", "-0.47"]

What is the df, if applicable? [ Select ] ["8", "9", "10", "3", "5", "not applicable"]

What is the critical value? [ Select ] ["-2.292", "+2.3060", "-2.306", "+2.292 and -2.292", "+2.262", "+2.306 and -2.306"]

What is your decision? [ Select ] ["accept the alternative hypothesis", "reject the null hypothesis", "retain the null hypothesis", "reject the alternative hypothesis", "accept the null hypothesis"]

What is your conclusion? [ Select ] ["We conclude that stress increase the menstrual cycle", "We conclude that stress does not affects the menstrual cycle", "We conclude that stress affects the menstrual cycle", "We cannot conclude that stress affects the menstrual cycle"]

If applicable, what is the effect size? [ Select ] ["not applicable", "large", "small", "medium"]

2.A health educator wants to evaluate the effect of a dental film on the frequency with which children brush their teeth. A random selection of 8 children are used for the experiment. First, a baseline of the number of times the children brush their teeth over a month's period is established. Next, the children are shown the dental film and again the number of teeth brushings are recorded for a month. The following data are recorded. Using= 0.05_{2 tail}, response to the questions below.

Child	Baseline	After film
1	25	28
2	28	29
3	22	25
4	30	30
5	26	25
6	24	27
7	25	28
8	22	24

Indicate your H₁ [ Select ] ["Watching the dental film will not effect the frequency with which children brush their teeth", "Watching the dental film will decrease the frequency with which children brush their teeth", "Watching the dental film will increase the frequency with which children brush their teeth", "Watching the dental film will effect the frequency with which children brush their teeth"]

Indicate you H₀ [ Select ] ["Watching the dental film will not effect the frequency with which children brush their teeth", "Watching the dental film will effect the frequency with which children brush their teeth", "Watching the dental film will decrease the frequency with which children brush their teeth", "Watching the dental film will increase the frequency with which children brush their teeth"]

What test are you doing? [ Select ] ["single sample t test", "single sample z test", "independent group t test", "paired group t test"]

What is the obtained statistics? [ Select ] ["3.13", "5.15", "3.28", "3.58"]

What is the df, if applicable? [ Select ] ["14", "not applicable", "7", "8", "16"]

What is the critical value? [ Select ] ["-2.145 and +2.145", "-2.365", "+2.365", "-2.365 and +2.365"]

What is your decision? [ Select ] ["accept the null hypothesis", "reject the alternative hypothesis", "reject the null hypothesis", "accept the alternative hypothesis", "retain the null hypothesis"]

What is your conclusion? [ Select ] ["We conclude watching the dental film will not effect the frequency with which children brush their teeth", "We conclude watching the dental film will effect the frequency with which children brush their teeth", "We cannot conclude We conclude watching the dental film will effect the frequency with which children brush their teeth"]

If applicable, what is the effect size? [ Select ] ["not applicable", "small", "large", "medium"]