Question1

A disease data for two independent groups are associated with the summary statistics reported in table blow. Given summary statistics in the table, please answer following questions 1-15.

Group	Disease	Non-disease	Total
1	45	55	100
2	55	45	100
Total	100	100	200

alpha-level	chi-squared value
0.2	1.64
0.05	3.84
0.01	6.63

Under null hypothesis, what is the expected number of subjects having disease in group 1?

Group of answer choices

55

50

45

Can not be determined

Question 2

Under null hypothesis, what is the expected number of subjects having non-disease in group 1?

Group of answer choices

55

50

45

Can not be determined

Question 3

Under null hypothesis, what is the expected number of subjects having disease in group 2?

Group of answer choices

55

50

45

Can not be determined

Question 4

Under null hypothesis, what is the expected number of subjects having non-disease in group 2?

Group of answer choices

55

50

45

Can not be determined

Question 5

An investigator is trying to test percent of disease in these two populations. The two-sided hypothesis are

Group of answer choices

H0p1=p2vsHAp1p2

H0:p^1=p^2vsHA:p^1p^2

Question 6

What is the Chi-Square value?

Group of answer choices

2

3.84

Can not be determined

Question 7

At level 0.05, the null hypothesis in question number 5 is

Group of answer choices

Reject

Retain

Can not be determined

Question 8

At level 0.2, the null hypothesis in question number 5 is

Group of answer choices

Reject

Retain

Can not be determined

Question 9

What is the sample proportion of disease in group 1?

Group of answer choices

50%

45%

55%

Can not be determined

Question 10

What is the sample proportion of disease in group 2?

Group of answer choices

50%

45%

55%

Can not be determined

Question 11

What is the risk difference (group 2 - group 1)?

Group of answer choices

0.45

0.05

0.55

0.1

Question 12

What is the relative risk (group 2 over group 1)?

Group of answer choices

0.5

1.49

1

1.22

Question 13

An investigator is trying to state a null hypothesis of relative risk. The null hypothesis is

Group of answer choices

0.5

1.49

1

1.22

Question 14

What is the odds ratio (group 2 over group 1)?

Group of answer choices

0.5

1.49

1

1.22

Question 15

An investigator is trying to state a null hypothesis of odds ratio. The null hypothesis is

Group of answer choices

0.5

1.49

1

1.22

Question 16

Disease data for two independent groups are associated with the summary statistics reported in table blow. Given summary statistics in the table, please answer following questions 16-28.

Group	Disease	Non-disease	Total
1	6	94	100
2	6	194	200
Total	12	288	300

Under null hypothesis, what is the expected number of subjects having disease in group 1?

Group of answer choices

4

6

8

12

96

192

Question 17

Under null hypothesis, what is the expected number of subjects having non-disease in group 1?

Group of answer choices

4

6

8

12

96

192

Question 18

Under null hypothesis, what is the expected number of subjects having disease in group 2?

Group of answer choices

4

6

8

12

96

192

Question 19

Under null hypothesis, what is the expected number of subjects having non-disease in group 2?

Group of answer choices

4

6

8

12

96

192

Question 20

Based on question 16-19, the Fisher exact test is

Group of answer choices

necessary

unnecessary

Can not be determined

Question 21

What is the sample proportion of disease in group 1?

Group of answer choices

4%

6%

8%

3%

Can not be determined

Question 22

What is the sample proportion of disease in group 2?

Group of answer choices

4%

6%

8%

3%

Can not be determined

Question 23

What is the overall sample proportion of disease (combining two groups together)?

Group of answer choices

4%

6%

8%

3%

Can not be determined

Question 24

What is the odds of having disease in group 1 (the closest one)?

Group of answer choices

0.06

0.03

0.04

0.08

Question 25

What is the odds of having disease in group 2 (the closest answer)?

Group of answer choices

0.06

0.03

0.04

0.08

Question 26

What is the odds ratio (group 1 over group 2, the closest answer)?

Group of answer choices

1

1.5

2

3

Question 27

What is the risk difference (group 1 - group 2)?

Group of answer choices

0.06

0.03

0.04

0.08

Question 28

What is the relative risk (group 1 over group 2)?

Group of answer choices

1

1.5

2

3

Question 29

Matched pairs data. 100 couples answered a policy question. The answer is either YES or NO. The data is summarized in the table below. Given summary statistics in the table, please answer following questions 29-30.

		Husband
		Yes	No
Wife	Yes	45	5
No	10	40

How many couples are concordant?

Group of answer choices

45

10

15

40

85

Question 30

How many couples are discordant?

Group of answer choices

45

10

15

40

85