# educational psychologist, writing homework help

Use the following for #1-3:

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An educational psychologist has developed an instructional program for children designed to promote creative thinking. To test the effectiveness of
this program, 7 fifth – grade children were selected at random from all the fifth-graders attending Lake Elementary School. The students were
randomly assigned to take the regular program or the new program and then after a period of time they were instructed in the other program. The
measure of creativity in this test is based on the number of ways a child can think to use common, everyday objects. A higher score implies more
creativity.

Student 1 2 3 4 5 6 7

Regular Program 15 8 19 4 16 9 11

New Program 21 11 16 5 20 7 16

1. Find each of the following: (Use 5% significance)

Ho = [a] Ha = [b] t = [c] p = [d]

2. Is the new program BETTER than the regular program? Explain.

3. Find the 95% confidence interval.

Use the following information for #4-5:

The design of controls and instruments affects how easily people can use them. A student project investigated this effect by asking 25 right-handed
students to turn a knob (with their right hands) that moved an indicator. There were two identical instruments, one with a right-hand thread and the
other with a left-hand thread. The following table gives the times in seconds each subject took to move the indicator a fixed distance:

Subject 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Right
113 105 130 101 138 118 87 116 75 96 122 103 116 107 118 103 111 104 111 89 78 100 89 85 88

Left
137 105 133 108 115 170 103 145 78 107 84 148 147 87 166 146 123 135 112 93 76 116 78 101 123

4. Find each of the following: (Use alpha level = .01)

Ho = [a] Ha = [b] t = [c] p = [d]

5. For right-handed people, are right-hand threads easier to use? Using your p-value from the previous problem, state your conclusion using alpha
level = .01

Use the following information for #6-8:

A random sample of students from a high school were chosen to determine if their sitting pulse rate was lower than their standing pulse rate. Each
student’s pulse rate was measured in both positions.

Sitting 62 74 82 88 82 66 64 84 72 82 80 72 64 62

Standing 68 78 80 92 58 96 72 100 82 76 92 74 60 58

6. Find each of the following: (Use 5% significance)

Ho = [a] Ha = [b] t = [c] p = [d]

7. Can we conclude the sitting pulse rate is lower? Using your p-value from the previous problem, state your conclusion using a 5% significance
level

8. Find the 95% confidence interval.

Use the following information for #9-10:

Suppose it is possible to measure a slow learners’ “reading IQs” before they are subjected to a teaching method. Eight pairs of slow learners with
similar reading IQs are found, and one member of each pair is randomly assigned to the standard teaching method while the other is assigned to the
new method. The data are given below.

Pair 1 2 3 4 5 6 7 8

New Method 77 74 82 73 87 69 66 80

Standard Method 72 68 76 68 84 68 61 78

9. Find each of the following: (Use 10% confidence)

Ho = [a] Ha = [b] t = [c] p = [d]

10. Do the data support the hypothesis that the population mean reading test score for slow learners taught by the new method is greater than the
mean reading test score for those taught by the standard method? (Use 10% confidence)