Manual Event (Session ID,DateTime,Event) = 4gsodv9i2d5hv0tblm1qmdd6jt 20220121081950 /web-based-audio-visual-learning-materials/programme-evaluation-and-impact-assessment-4/presurvey/

1

Which of the following is/are required for calculating sample size?

- A desired power
- A desired level of significance (i.e. alpha)
- A clinical meaningful difference

A

Only i
B

Only ii
C

Only ii and iii
D

i, ii and iii
2

Which of the following statements about 95% confidence is correct?

A

95% confidence means that you are 95% confident that your result is positive.
B

95% confidence means that you are 95% confident that your result is negative.
C

95% confidence means that you are 95% confident that there is a signal of an effect.
D

95% confidence means that you are 95% confident that there is no signal of an effect.
3

Which of the following statements is correct?

A

There are two techniques for calculating sample size: making reference to previous studies and guessing.
B

There are two techniques for calculating sample size: making reference to previous studies and testing hypotheses.
C

There are two techniques for calculating sample size: estimating and testing hypotheses.
D

There are two techniques for calculating sample size: making reference to previous studies and estimating.
4

Which of the following statements is correct?

A

Calculating the sample size for single-group studies is based on the confidence interval, which is the precision required for estimating ratios, differences and ranges.
B

Calculating the sample size for two -group studies is based on the confidence interval, which is the precision required for estimating significance, proportions and means.
C

Calculating the sample size for two -group studies is based on the confidence interval, which is the precision required for estimating ratios, significance and ranges.
D

Calculating the sample size for single-group studies is based on the confidence interval, which is the precision required for estimating rates, proportions and means.
5

Which of the following information is required for calculating the sample size for comparative studies?

- The desired confidence interval
- The desired power
- The ratio of the sample size of Group 2 to Group 1
- The means or mean difference of the two groups
- The standard deviation or variance of the two groups

A

Only i
B

Only ii
C

Only ii and iii
D

All of the listed information is required.