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Description

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Question

A scientist determined the effectiveness of segmental wire fixation in athletes with spondyolysis.
Between 1993 and 2000, 20 athletes (6 women and 14 men) with lumbar spondyolysis were
treated surgically with the technique. The following table gives the Japanese Orthopedics
Association evaluation score for lower back pain syndrome for men and women prior to the
surgery. The lower score indicates less pain.
Gender??? JOA scores
Female??? 14, 13, 24, 21, 20, 21
Male???? 21, 26, 24, 24, 22, 23, 18, 24, 13, 22, 25, 23, 21, 25
Give conclusion for the evaluation of the segmental wire fixation treatment between male and
female.

Biostatistics problem set 2; due date 2 days before the final exam

1. We wish to estimate the average number of heart beats per minute for a certain population. The

average number of heart beats per minute for a sample of 49 subjects was found to be 90. Assume

that these 49 patients constitute a random sample, and that the population is normally distributed

with a standard deviation of 10. Construct 90, 95, 99 percent confidence intervals for the

population mean

2. A scientist determined the effectiveness of segmental wire fixation in athletes with spondyolysis.

Between 1993 and 2000, 20 athletes (6 women and 14 men) with lumbar spondyolysis were

treated surgically with the technique. The following table gives the Japanese Orthopedics

Association evaluation score for lower back pain syndrome for men and women prior to the

surgery. The lower score indicates less pain.

Gender

JOA scores

Female

14, 13, 24, 21, 20, 21

Male

21, 26, 24, 24, 22, 23, 18, 24, 13, 22, 25, 23, 21, 25

Give conclusion for the evaluation of the segmental wire fixation treatment between male and

female.

3. Regress Y against X with the following data from a random sample of 15 observations:

a.

What is the regression equation?

b.

What?s the 90% confidence interval for the slope?

c.

Test the null hypothesis that ?the slope is zero? at an ? of 1%.

d.

Make a point prediction of Y when X=10.

f.

Assume that the value of X is controllable. What should be the value of X if the desired

value of Y is 100?

X

Y

0.3

2.9

1.9

6.0

2.3

6.5

2.6

9.6

4.2

11.5

4.7

14.0

6.2

17.4

6.9

18.1

7.0

20.2

7.8

16.2

8.8

19.2

11.4

27.5

12.7

26.5

13.5

31.2

14.0

24.8

Paper#9257326 | Written in 27-Jul-2016

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