Hi please help me with the following multiple choice questions :)

If the correlation between height in inches and weight in pounds is .5, then the correlation between height in centimetres and weight in pounds is the following: Select one:

a.

.1969

b.

.5000

c.

.2500

d.

.5051

When computing a confidence interval for ,when is unknown, which of the followingassumptions must be true?

Select one:

a.The sample variances are the same

b.The population of scores is normal

c.The sampling distribution is normal

d.Sample size is greater than 30

Determining causality when comparing the means of two independent groups is simpler with the following: Select one:

a.

a large effect size

b.

a continuous independent variable

c.

an experiment

d.

a quasi-experiment

A matched-samples design is not susceptible to carryover effects. Select one:

a. True

b . False