Manual Event (Session ID,DateTime,Event) = 6nalr8km7bj1t8hllilfiuq8rr 20210729100044 /courses-for-public/programme-evaluation-and-impact-assessment-3/presurvey/

1

When determining the sample size, the researcher needs to consider which of the following?

- The desired power
- The expected effect size
- The acceptable level of significance

A

Only i
B

Only ii
C

ii and iii
D

i, ii and iii
2

Which of the following statements about power is correct?

A

Power is commonly denoted as β, which refers to a type II error (i.e. acceptance of a false null hypothesis)
B

Power is commonly denoted as 1 – β, in which β refers to a type I error (i.e. acceptance of a false null hypothesis)
C

Power refers to the probability that a statistical test will reject the null hypothesis when the null hypothesis is false.
D

Power refers to the probability that a statistical test will accept the null hypothesis when the null hypothesis is false.
3

*Effect size* is

- A qualitative measure of the magnitude of the difference between groups.
- A quantitative measure of the magnitude of the difference between groups.
- Particularly valuable for quantifying the effectiveness of a particular intervention.

A

Only i
B

Only ii
C

Only ii and iii
D

i, ii and iii
4

Which of the following is/are used as an index of effect size?

- Pearson’s correlation (
*r*) - Cohen’s
*d* - Eta-squared (η
)^{2}

A

Only i
B

Only ii
C

Only ii and iii
D

i, ii and iii
5

Which of the following statements about sample size is correct?

A

The smaller the sample size, the larger the variance of the sampling distribution of the mean.
B

The larger the sample size, the larger the variance of the sampling distribution of the mean.
C

The smaller the sample size, the smaller the variance of the sampling distribution of the mean.
D

The larger the sample size, the smaller the variance of the sampling distribution of the mean.