i need help with statistics

Aug 19th, 2014
RockCafe
Category:
Statistics
Price: $20 USD

Question description


1. A school psychologist administers an interview assessment that screens for possible post-traumatic stress disorder (PTSD) to school children who live in an area that was recently affected by a natural disaster. She assumes that children in this area have higher scores than children in the general population, who normally score a 2.3. The table on the following page shows the scores for a particular class of children at the school. Using the table, enter the data into a new SPSS file and conduct a single sample t-test to evaluate whether or not these children scored higher than the general population.

The steps will be the same as the ones you have been practicing in Part 1 of the assignment—the only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the “Variable View,” then return to the “Data View” to enter the data. (2 pts)

PTSD Interview Scores

5

9

4

1

1.2

6.5

8

7.4

1.2

3.2

2

1.5

4.9

4

1.3

2

2. Write a Results section in current APA style describing the outcome. All homework “Results sections” must follow the example given in the Course Content document “Writing Results of Statistical Tests in Current APA Format” (Note: you do not have to refer to a figure). (4 pts)

3. A math teacher wants to evaluate whether or not a new method of teaching leads to improved scores on a geometry test. To test this claim, she administers similar geometry tests to 16 students before and after they have been introduced to the new method. She decides to use a two-tailed test to provide for detecting results in the opposite direction, just in case. Using the table below, enter the data into a new SPSS data file and test the math teacher’s claim using a paired-samples t-test).

The steps will be the same as the ones you have been practicing in Part 1 of the assignment—the only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the “Variable View,” then return to the “Data View” to enter the data. (2 pts)

Student

Geometry Test Before

Geometry Test After

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

100

64

86

78

89

97

75

85

99

91

100

80

79

93

62

70

98

67

80

80

89

95

80

96

100

95

100

83

83

91

70

72

4. The null hypothesis for this scenario can be written as follows: “There is no difference between mean test scores before and after the introduction of the geometry teaching method (M before = M after).” Based on your results, should this hypothesis be accepted or rejected, and why? Write your answer in sentence form. (2 pts)


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