A sample of n = 25 scores has a mean of M = 40 and a variance of s2= 100. What is the estimated standard error for the sample mean?

Select one:

a.

2

b.

1

c.

4

d.

2

On average, what value is expected for the F-ratio if the null hypothesis is true?

Select one:

a.

0

b.

k - 1

c.

1.00

d.

N - k

Under what circumstances is the point-biserial correlation used?

Select one:

a.

when X consists of regular, numerical scores but Y is dichotomous

b.

when both X and Y are dichotomous variables

c.

when both X and Y are measured on an ordinal scale (ranks)

d.

in the same circumstances when a repeated-measures t test would be used

The sign (+ or -) and the strength of a correlation are independent of each other.

Select one:

a.

False

b.

True

A research design that uses a separate group of participants for each treatment condition(or for each population) is called an independent-measures research designor a____.

Select one:

a.

between-subjects design

b.

dependent-measures design

c.

within-subjects design

d.

repeated-measures design

Which of the following accurately describes the observed frequencies for a chi-square test?

Select one:

a.

They are always the same value.

b.

They can contain fractions or decimal values.

c.

They are always whole numbers.

d.

They can contain both positive and negative values.

An F-ratio near 1.00 is an indication that the null hypothesis is likely to be true.

Select one:

a.

True

b.

False

Which of the following sets of correlations is correctly ordered from the highest to the lowest degree of relationship?

Select one:

a.

+0.83, +0.10, 0.91, 0.03

b.

+0.83, +0.10, 0.03, 0.91

c.

0.91, +0.83, +0.10, 0.03

d.

0.91, +0.83, 0.03, 0.10

For which of the following correlations would the data points be most closely aligned with the regression line?

Select one:

a.

r = 0.10

b.

r = 0.80

c.

r = 0.50

d.

r = 0.99

Suppose that the correlation between height and weight for adults is +0.40. What proportion (or percent) of the variability in weight can be explained by the relationship with height?

Select one:

a.

84%

b.

40%

c.

60%

d.

16%