Hemoglobin level data for two independent groups are associated with the summary statistics reported in the table blow. Given summary statistics in the table, answer questions 1 - 9. Equal variance is assumed.

Group	Number of Subjects n	Sample Mean X	Sample Standard Deviation s
1	10	13.2	2.0
2	12	11.4	2.0

alpha-level	Confidence level	t-value
0.05	95%	2.086
0.01	99%	2.848

An investigator is trying to test hemoglobin level difference in these two populations. The two-sided hypotheses are

Group of answer choices

H01=2vsHA12

H0X1=X2vsHAX1X2

H012vsHA1>2

Flag question: Question 2

At a alpha-level 0.05, the null hypothesis in question number 1 is

Group of answer choices

Reject

Retain

Can not be determined

Flag question: Question 3

At a alpha-level 0.01, the null hypothesis in question number 1 is

Group of answer choices

Reject

Retain

Can not be determined

Flag question: Question 4

Hemoglobin level data for two independent groups are associated with the summary statistics reported in the table blow. Given summary statistics in the table, answer questions 1 - 9. Equal variance is assumed.

Group	Number of Subjects n	Sample Mean	Sample Standard Deviation
1	10	13.2	2.0
2	12	11.4	2.0

alpha-level	Confidence level	t-value
0.05	95%	2.086
0.01	99%	2.848

The 95% confidence interval for 12is

Group of answer choices

0.014 to 3.586

-0.639 to 4.239

-0.639 to 3.356

0.014 to 4.239

Flag question: Question 5

Hemoglobin level data for two independent groups are associated with the summary statistics reported in the table blow. Given summary statistics in the table, answer questions 1 - 9. Equal variance is assumed.

Group	Number of Subjects n	Sample Mean	Sample Standard Deviation
1	10	13.2	2.0
2	12	11.4	2.0

alpha-level	Confidence level	t-value
0.05	95%	2.086
0.01	99%	2.848

Is the answer to question 2 consistent with the answer to this question 4?

Group of answer choices

Yes

No

Can not be determined

Flag question: Question 6

Hemoglobin level data for two independent groups are associated with the summary statistics reported in the table blow. Given summary statistics in the table, answer questions 1 - 9. Equal variance is assumed.

Group	Number of Subjects n	Sample Mean	Sample Standard Deviation
1	10	13.2	2.0
2	12	11.4	2.0

alpha-level	Confidence level	t-value
0.05	95%	2.086
0.01	99%	2.848

The 99% confidence interval for 12is

Group of answer choices

0.014 to 3.586

-0.639 to 4.239

-0.639 to 3.356

0.014 to 4.239

Flag question: Question 7

Hemoglobin level data for two independent groups are associated with the summary statistics reported in the table blow. Given summary statistics in the table, answer questions 1 - 9. Equal variance is assumed.

Group	Number of Subjects n	Sample Mean	Sample Standard Deviation
1	10	13.2	2.0
2	12	11.4	2.0

alpha-level	Confidence level	t-value
0.05	95%	2.086
0.01	99%	2.848

Is the answer to question 3 consistent with the answer to this question 6?

Group of answer choices

Yes

No

Can not be determined

Flag question: Question 8

Hemoglobin level data for two independent groups are associated with the summary statistics reported in the table blow. Given summary statistics in the table, answer questions 1 - 9. Equal variance is assumed.

Group	Number of Subjects n	Sample Mean	Sample Standard Deviation
1	10	13.2	2.0
2	12	11.4	2.0

alpha-level	Confidence level	t-value
0.05	95%	2.086

The pooled estimate of variance is

Group of answer choices

4

2

8

Flag question: Question 9

Hemoglobin level data for two independent groups are associated with the summary statistics reported in the table blow. Given summary statistics in the table, answer questions 1 - 9. Equal variance is assumed.

Group	Number of Subjects n	Sample Mean	Sample Standard Deviation
1	10	13.2	2.0
2	12	11.4	2.0

alpha-level	Confidence level	t-value
0.05	95%	2.086
0.01	99%	2.848

The pooled degrees of freedom is

Group of answer choices

10

12

20

22

Flag question: Question 10

Please indicate a one-sample, paired-sample or two-sample t-test for following data: 10 boys and 10 girls are randomly selected from the fifth grade in an element school. The t-test used to compare mean of weight between boys and girls is

Group of answer choices

One-sample

Paired-sample

Two-sample

Flag question: Question 11

Please indicate a one-sample, paired-sample or two-sample t-test for following data: 10 boys randomly selected from the fifth grade in an element school. The t-test used to compare the mean of weight to a known national mean is

Group of answer choices

One-sample

Paired-sample

Two-sample

Flag question: Question 12

Please indicate a one-sample, paired-sample or two-sample t-test for following data: 10 girls randomly selected from the fifth grade in an element school. The vision scores of both eyes are tested. The t-test used to compare the mean of vision scores difference between left and right is

Group of answer choices

One-sample

Paired-sample

Two-sample

Flag question: Question 13

Please indicate a one-sample, paired-sample or two-sample t-test for following data: 10 male students and 10 female students are randomly selected from those students who took two SAT tests. The t-test used to compare the difference of two SAT tests for all 20 students is

Group of answer choices

One-sample

Paired-sample

Two-sample

Flag question: Question 14

Please indicate a one-sample, paired-sample or two-sample t-test for following data: 10 male students and 10 female students are randomly selected from those students who took two SAT tests. The t-test used to compare the difference of two SAT tests for 10 male students is

Group of answer choices

One-sample

Paired-sample

Two-sample

Flag question: Question 15

Please indicate a one-sample, paired-sample or two-sample t-test for following data: 10 male students and 10 female students are randomly selected from those students who took two SAT tests. The t-test used to compare the difference of two SAT tests between 10 male students and 10 females students.

Group of answer choices

One-sample

Paired-sample

Two-sample

Flag question: Question 16

Pain relief drug data for two independent groups are associated with the summary statistics reported in the table blow. Given summary statistics in the table, answer question number 16-25.

Group	Sample Size [n]	Number of improvement (x)	Percent of improvement
1	200	90	45%
2	200	110	55%

alpha-level	Confidence level	z-value
0.1	90%	1.64
0.05	95%	1.96
0.01	99%	2.58

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

Group of answer choices

H0p1=p2vsHAp1p2

H0p^1=p^2vsHAp^1p^2

H0p1p2vsHAp1>p2

Flag question: Question 17

At a alpha-level 0.1, the null hypothesis in question number 16 is

Group of answer choices

Reject

Retain

Can not be determined

Flag question: Question 18

The 90% confidence interval forp2p1is

Group of answer choices

0.018 to 0.182

0.002 to 0.198

-0.028 to 0.228

Flag question: Question 19

Is the answer to question 17 consistent with the answer to the question 18?

Group of answer choices

Yes

No

Can not be determined

Flag question: Question 20

At an alpha-level 0.05, the hypothesis in question number 16 is

Group of answer choices

Reject

Retain

Can not be determined

Flag question: Question 21

The 95% confidence interval for p2p1is

Group of answer choices

0.018 to 0.182

0.002 to 0.198

-0.028 to 0.228

Flag question: Question 22

Is the answer to question 20 consistent with the answer to the question 21?

Group of answer choices

Yes

No

Can not be determined

Flag question: Question 23

At an alpha-level 0.01, the hypothesis in question number 16 is

Group of answer choices

Reject

Retain

Can not be determined

Flag question: Question 24

The 99% confidence interval for p2p1is

Group of answer choices

0.018 to 0.182

0.002 to 0.198

-0.028 to 0.228

Flag question: Question 25

Is the answer to question 23 consistent with the answer to the question 24?

Group of answer choices

Yes

No

Can not be determined

Flag question: Question 26

Smoking and respiratory disease data are summarized in the table below. Smoking is risk factor. Please answer question number 26-30.

	Respiratory Disease	Total
	Yes	No
Smoking	40	60	100
No Smoking	20	80	100
Total	60	140

The proportion of respiratory disease for smoking people is

Group of answer choices

20%

30%

40%

67%

Flag question: Question 27

Smoking and respiratory disease data are summarized in the table below. Smoking is risk factor. Please answer question number 26-30.

	Respiratory Disease	Total
	Yes	No
Smoking	40	60	100
No Smoking	20	80	100
Total	60	140

The proportion of respiratory disease for non-smoking people is

Group of answer choices

20%

30%

40%

67%

Flag question: Question 28

Smoking and respiratory disease data are summarized in the table below. Smoking is risk factor. Please answer question number 26-30.

	Respiratory Disease	Total
	Yes	No
Smoking	40	60	100
No Smoking	20	80	100
Total	60	140

The risk difference of respiratory disease for smoking people vs. non-smoking people is

Group of answer choices

20%

30%

40%

67%

Flag question: Question 29

Smoking and respiratory disease data are summarized in the table below. Smoking is risk factor. Please answer question number 26-30.

	Respiratory Disease	Total
	Yes	No
Smoking	40	60	100
No Smoking	20	80	100
Total	60	140

The relative risk (risk ratio) of respiratory disease for smoking people vs. non-smoking people is

Group of answer choices

1.0

1.5

2.0

Flag question: Question 30

Smoking and respiratory disease data are summarized in the table below. Smoking is risk factor. Please answer question number 26-30.

	Respiratory Disease	Total
	Yes	No
Smoking	40	60	100
No Smoking	20	80	100
Total	60	140

The overall proportion of respiratory disease regardless smoking or non-smoking is

Group of answer choices

20%

30%

40%

67%