Project #12934 - Web cal 4& 5

Web Calculator Exercise 4

 

Non-parametric tests (Chi-square tests, Wilcoxon-rank-sum & Wilcoxon signed-ranks tests)

 

Note: When searching for a web calculator for the Wilcoxon-rank-sum test, please be aware that this test is also called the “Mann-Whitney U test”.  This test is used for Ordinal data and for an independent groups design. 

 

1.      A high school counselor wants to examine whether the teenage pregnancy rate at her school is different from the rate nationwide. She knows that the rate nationwide is 15 %. She randomly selects 80 female students from her high school.  She finds that 9 out of 80 students are either pregnant now or have been pregnant previously.

 

a.       What statistical test should be used to analyze the data?

b.      Identify H0 and Ha for this study

c.       Conduct the appropriate analysis

d.      Should H0 be rejected? What should the researcher conclude?

2.      You notice at the gym that it appears more women tend to work out together, whereas more men tend to work out alone.  To determine whether this difference is significant, you collect data on the workout preferences for a sample of men and women at your gym.  The data follows.

 

Males

Females

Together

5

8

Alone

7

6

 

a.       What statistical test should be used to analyze the data?

b.      Identify H0 and Ha for this study

c.       Conduct the appropriate analysis.

d.      Should H0 be rejected?  What should the researcher conclude?

 

3.      A researcher is interested in comparing the Christian maturity level of students who volunteer for community service versus those who do not. The researcher assumes that those who perform community service will have higher Christian maturity scores. The maturity scores tend to be skewed (not normally distributed). Higher scores indicate higher Christian maturity.

No Community Service

Community Service

32

47

40

48

54

59

13

72

20

80

26

55

 

a.       What statistical test should be used to analyze these data?

b.      Is this a one- or two- tailed test?

c.       Identify H0 and Ha for this study

d.      Conduct the appropriate analysis

e.       Should H0 be rejected? What should the researcher conclude?

 

4.      A researcher is interested in comparing tastiness of different kinds of cheese in grilled cheese sandwiches.  The researcher expects that Cheddar cheese grilled sandwiches are rated tastier than Swiss cheese grilled sandwiches.  This researcher wants to use a within-subjects design. Each participant tastes both Cheddar and Swiss cheese grilled sandwiches. Except for the types of cheese used in the grilled sandwiches, there is no difference between the two kinds of sandwiches. Participants indicate the degree of tastiness on a 10-point scale and the ratings appear in the following table. Tastiness scores tend to be skewed.

 

Participant

Cheddar

Swiss

1

7

4

2

6

5

3

9

6

4

10

8

5

6

7

6

7

6

7

8

9

 

a.        What statistical test should be used to analyze these data?

b.      Identify H0 and Ha for this study.

c.       Conduct the appropriate analysis.

d.      Should H0 be rejected? What should the researcher conclude?

 

 

 

Web Calculator Exercise 5

 

ANOVAs

 

1.      A researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems. Eight participants are randomly assigned to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral Therapy (CBT), and Interpersonal Therapy (IT). All participants complete the weekly treatment for 8 weeks. Participants take an anger test before and after the 8-week treatments. Each participant’s difference score (= anger score after the treatment minus (–) anger score before the treatment) is shown in the following table. The three therapists in this experiment have equal educational levels and clinical experiences.    

CT

CBT

IT

3

5

7

4

4

8

4

6

9

4

6

10

3

5

6

8

4

7

6

9

11

2

7

10

a.       What statistical test should be used to analyze the data?

b.      Identify H0 and Ha for this study.

c.       Conduct the appropriate analysis.

d.      Should H0 be rejected? What should the researcher conclude?

 

2.      A teacher is interested in comparing the effects of three different types of rehearsal methods (Rote rehearsal, Imagery, and Story) on number of words recalled. Participants are randomly assigned into three different groups. In each group, participants are asked to study a list of words using the assigned method. The following table shows the result.

 

Rote rehearsal

Imagery

Story

5

5

7

5

4

6

4

6

8

6

7

9

5

7

6

4

6

9

3

8

8

5

5

10

6

7

9

 

a.       What statistical test should be used to analyze the data?

b.      Identify H0 and Ha for this study.

c.       Conduct the appropriate analysis.

d.      Should H0 be rejected? What should the researcher conclude?

e.       If there is a significant difference, conduct the post hoc test.

 

3.      A professor is interested in whether there is a difference in counseling students’ statistics competency scores among 1) those who have never taken any statistics course, 2) those who have only taken an undergraduate statistics course, 3) those who have taken COUN 503, and 4) those who have taken an advanced statistic course while working on a Ph. D. The professor gathers information from a random sample of students and obtains the statistics competency scores. The scores are normally distributed.

 

1)

2)

3)

4)

7

11

13

15

6

11

14

14

8

10

15

15

5

12

12

15

4

13

13

10

4

15

13

15

 

a.       What statistical test should be used to analyze these data?

 

b.      Identify H0 and Ha for this study.

 

c.       Conduct the appropriate analysis.

 

d.      Should H0 be rejected? What should the researcher conclude?

 

 

Subject Mathematics
Due By (Pacific Time) 09/28/2013 10:00 pm
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