Case Study 14-1A 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. High stress2023181922 n1-1Relatively stress free2631252630n2-1 __ 8. Refer to Case Study 14-1. The obtained value of the appropriate statistic is _________.a.tobt = -4.73b.tobt = -4.71c.tobt = -3.05d.tobt = -0.47 ____ 9. Refer to Case Study 14-1. The df for determining tcrit are _________.a.4b.9c.8d.3 ____ 10. Refer to Case Study 14-1. Using a = .052 tail, tcrit = _________.a.+2.262b.+2.306c.±2.262d.±2.306 ____ 11. Refer to Case Study 14-1. Using a = .052 tail, your conclusion is _________.a.accept H0; stress does not affect the menstrual cycleb.retain H0; we cannot conclude that stress affects the menstrual cyclec.retain H0; stress affects the menstrual cycled.reject H0; stress affects the menstrual cycle (1 points) Using the data above calculate omega squared (2 points) Using the data above calculate cohen’s d Case Study 14-2A 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. Subject12345678After film2829253025272824Baseline2528223026242522 ____ 14. Refer to Case Study 14-2. The obtained value of the appropriate statistic is _________.a.-3.13b.3.14c.3.58d.3.57 ____ 15. Refer to Case Study 14-2. The df for determining tcrit equal _________.a.8b.16c.7d.14 ____ 16. Refer to Case Study 14-2. Using a = .052 tail, tcrit = _________.a.+2.365b.±2.365c.±2.145d.+2.365 ____ 17. Refer to Case Study 14-2. Using a = 0.052 tail, what do you conclude?a.retain H0; the film has no effect on the frequency of tooth brushingb.reject H0; the film affects the frequency of tooth brushingc.accept H0; the film has no effect on the frequency of tooth brushingd.reject H0; chance alone is a reasonable explanation of the data

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Description: Case Study 14-1A 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

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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. High stress 20 23 18 19 22 n1-1 Relatively stress free 26 31 25 26 30 n2-1 8. Refer to Case Study 14-1. The obtained value of the appropriate statistic is ___. a. tobt = -4.73 b. tobt = -4.71 c. tobt = -3.05 d. tobt = -0.47 9. Refer to Case Study 14-1. The df for determining tcrit are _. a. 4 b. 9 c. 8 d. 3 10. Refer to Case Study 14-1. Using a = .052 tail, tcrit = _. a. +2.262 b. +2.306 c. ±2.262 d. ±2.306 11. Refer to Case Study 14-1. Using a = .052 tail, your conclusion is _____. a. accept H0; stress does not affect the menstrual cycle b. retain H0; we cannot conclude that stress affects the menstrual cycle c. retain H0; stress affects the menstrual cycle d. reject H0; stress affects the menstrual cycle

MATLAB: An Introduction with Applications

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ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

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Case Study 14-1

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.

High stress

22 n1-1

Relatively stress free

n2-1

__ 8. Refer to Case Study 14-1. The obtained value of the appropriate statistic is _________.

a.	t_obt = -4.73
b.	t_obt = -4.71
c.	t_obt = -3.05
d.	t_obt = -0.47

____ 9. Refer to Case Study 14-1. The df for determining t_crit are _________.

a.	4
b.	9
c.	8
d.	3

____ 10. Refer to Case Study 14-1. Using a = .05_{2 tail}, t_crit = _________.

a.	+2.262
b.	+2.306
c.	±2.262
d.	±2.306

____ 11. Refer to Case Study 14-1. Using a = .05_{2 tail}, your conclusion is _________.

a.	accept H₀; stress does not affect the menstrual cycle
b.	retain H₀; we cannot conclude that stress affects the menstrual cycle
c.	retain H₀; stress affects the menstrual cycle
d.	reject H₀; stress affects the menstrual cycle

(1 points) Using the data above calculate omega squared

(2 points) Using the data above calculate cohen’s d

Case Study 14-2

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.

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

____ 14. Refer to Case Study 14-2. The obtained value of the appropriate statistic is _________.

a.	-3.13
b.	3.14
c.	3.58
d.	3.57

____ 15. Refer to Case Study 14-2. The df for determining t_crit equal _________.

a.	8
b.	16
c.	7
d.	14

____ 16. Refer to Case Study 14-2. Using a = .05_{2 tail}, t_crit = _________.

a.	+2.365
b.	±2.365
c.	±2.145
d.	+2.365

____ 17. Refer to Case Study 14-2. Using a = 0.05_{2 tail}, what do you conclude?

a.	retain H₀; the film has no effect on the frequency of tooth brushing
b.	reject H₀; the film affects the frequency of tooth brushing
c.	accept H₀; the film has no effect on the frequency of tooth brushing
d.	reject H₀; chance alone is a reasonable explanation of the data

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