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for each question, provide SPSS output for the selected test and (where specified) write up the results in APA format as you would for a journal article. A group of 30 participants is divided in half based on their self-rating of the vividness of their visual imagery. Each participant is tested on how many colors of objects he or she can correctly recall from a briefly seen display. The results of this experiment are below. (Note: You will need one column in SPSS for the IV with two levels [vivid/less vivid] and one for the DV.) Vivid Less Vivid 18 14 17 12 16 13 15 10 14 8 13 8 9 7 8 6 7 5 6 4 5 3 11 2 13 5 18 11 18 14 Enter the data into SPSS and perform an independent samples t-test of the null hypothesis that vividness of visual imagery does not affect the recall of colors; use alpha = .01 (or 99% confidence), two-tailed. (Hint: The default alpha level is not .01; see options in the test menu.) What is your statistical conclusion? SPSS output: Results write-up: What are some of the limitations that prevent you from concluding that the visual imagery causesimproved color recall in this type of experiment? An educator has invented a new way to teach geometry to high school students. To test this new teaching method, the educator matches 16 tenth-graders into 8 pairs based on their grades in previous math courses. Then the students in each pair are randomly assigned to either the new method or the traditional method. At the end of a full semester of geometry training, all students take same standard high school geometry test. The scores for each student in this hypothetical experiment are as follows: Traditional New 65 67 73 79 70 83 85 80 93 99 88 95 72 80 69 100 Perform a paired-samples t-test for this experiment (p = .01 or 99% confidence, two-tailed). Is there a significant difference between the two teaching methods? SPSS output: Results write-up: Find the 99% confidence interval for the population difference of the two teaching methods. Explain how these confidence intervals confirm the results of the t-test conducted in SPSS.

for each question, provide SPSS output for the selected test and (where specified) write up the results in APA format as you would for a journal article.

 

 

 

 

 

 

 

A group of 30 participants is divided in half based on their self-rating of the vividness of their visual imagery. Each participant is tested on how many colors of objects he or she can correctly recall from a briefly seen display. The results of this experiment are below. (Note: You will need one column in SPSS for the IV with two levels [vivid/less vivid] and one for the DV.)

 

 

 

 

 

 

 

Vivid

 

Less Vivid

 

18

 

14

 

17

 

12

 

16

 

13

 

15

 

10

 

14

 

8

 

13

 

8

 

9

 

7

 

8

 

6

 

7

 

5

 

6

 

4

 

5

 

3

 

11

 

2

 

13

 

5

 

18

 

11

 

18

 

14

 

 

 

 

 

 

 

Enter the data into SPSS and perform an independent samples t-test of the null hypothesis that vividness of visual imagery does not affect the recall of colors; use alpha = .01 (or 99% confidence), two-tailed. (Hint: The default alpha level is not .01; see options in the test menu.) What is your statistical conclusion?

 

 

 

 

 

 

 

SPSS output:

 

 

 

 

 

 

 

 

 

Results write-up:

 

 

 

 

 

 

 

 

 

What are some of the limitations that prevent you from concluding that the visual imagery causesimproved color recall in this type of experiment?

 

 

 

 

 

 

 

An educator has invented a new way to teach geometry to high school students. To test this new teaching method, the educator matches 16 tenth-graders into 8 pairs based on their grades in previous math courses. Then the students in each pair are randomly assigned to either the new method or the traditional method. At the end of a full semester of geometry training, all students take same standard high school geometry test. The scores for each student in this hypothetical experiment are as follows:

 

 

 

 

 

 

 

Traditional

 

New

 

65

 

67

 

73

 

79

 

70

 

83

 

85

 

80

 

93

 

99

 

88

 

95

 

72

 

80

 

69

 

100

 

 

 

 

 

 

 

Perform a paired-samples t-test for this experiment (p = .01 or 99% confidence, two-tailed). Is there a significant difference between the two teaching methods?

 

 

 

 

 

 

 

SPSS output:

 

 

 

 

 

 

 

 

 

Results write-up:

 

 

 

 

 

 

 

 

 

Find the 99% confidence interval for the population difference of the two teaching methods. Explain how these confidence intervals confirm the results of the t-test conducted in SPSS.

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