1. Frequency distribution of math scores

Class Interval f

60-64 5

55-59 5

50-54 10

45-49 15

40-44 20

35-39 40

30-34 65

25-29 60

20-24 40

15-19 25

10-14 15

____

N=300

1. Find a score below which 50% of the cases fall
2. A score below which 75% of the cases fall
3. A score below which 25 % of the cases fall
4. The difference between the highest and lowest score

Use the above frequency distribution, determine the following;

1. d8
2. p44
3. p88
4. d2

2. Raw scores; Use Spearman Rho

Wt in tons Average miles per gallon

2 18.0

3 18.6

4 17.4

3 18.4

4 17.5

5 16.0

3. Raw Scores given; Use Spearman Rho

Reading level # of Mag. Subscribe

7.5 5

6.4 4

7.5 7

9.1 8

5.9 5

7.5 5

6.4 3

7.4 5

4.5 1

3.5 2

9.8 10

4. Calculate the standard deviation and variance of the scores contained in the following table

X

25

28

35

37

38

40

42

45

47

50

1. Many graduate schools require their students to take the GRE for admittance to degree programs. A researcher wondered if their was a relationship between the performance on the GRE and in graduate programs in Greensfield University. To test this hypothesis he gathered the GRE scores for the last 100 graduates and matched them with the student's GPA at graduation. Test the indicated hypothesis.
   A
   B
   C
   D
   E
2. Many elementary schools use the recommendations from kindergarten teachers for placement of the students in reading groups. One teacher wondered how reliable these recommendations were for children after they entered the first grade. To in their classes according to the estimated reading ability. At the end of the first grade the children were given a test and rank ordered according to the scores earned. These were in the estimated reading ability scores but there were a few ties in the measured reading ability scores. Test to see if there is a significant relationship between the two measures.

A

B

C

D

E

3. A counselor became aware through his contact with students that often the students that were in academic troubles were also the student who owned their own car rather than using a family car. To test this observation he took a random sample of 150 students. For each student he computed the Grade Point Average and placed the student in the group who did their own car or in the group who did not own their own car. He then tested to see if there was significant differences between the grade point average of the two groups. (There were a few ties among the grade point averages.)

A

B

C

D

E

4. A university statistics teacher was aware of the increasing number of older students attending college to obtain their masters degree. Many were extremely uneasy about the subject of statistics. To study the relationship between number of years a student has not attended school and the general anxiety level the professor selected one of his classes and administered to the students Sarason's General Anxiety Scale and also asked each student the number of years they had waited between getting their B. A. and starting graduate school. He then tested the indicated hypothesis. (There were some ties in the number of years waiting, but none in General Anxiety Scores).

A
B
C
D
E

5. The high turn-over rate as well as the degree of independence displayed by teachers in the high school setting had interested Mr. Howe. He felt that there might be a relationship between the number of years a teacher had taught and the teacher's attitude towards the students. To test this hypotheses he administered to all the high school teachers in an urban area an attitude instrument to measure the teacher's attitude toward the students. In addition he asked each teacher to indicate the number of years of teaching experience. He then tested the indicated hypothesis (There were some ties in both variables).

A
B
C
D
E

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