Question 19(1 point)

In general, the larger the value of the sample variance, the greater the likelihood of rejecting the null hypothesis.

Question 19 options:

	a) True
	b) False

Question 20(1 point)

On average, a sample ofn = 16 scores from a population withs= 10 will provide a better estimate of the population mean than you would get with a sample ofn = 16 scores from a population withs = 5.

Question 20 options:

	a) True
	b) False

Question 21(1 point)

One advantage of a repeated-measures design is that it typically requires fewer participants than an independent-measures design.

Question 21 options:

	a) True
	b) False

Question 22(1 point)

For a one-tailed test witha = .05 and a sample ofn = 9, the critical value for the t statistic is t = 1.860.

Question 22 options:

	a) True
	b) False

Question 23(1 point)

For a two-tailed test witha = .05 and a sample ofn = 16, the boundaries for the critical region are t = 2.120.

Question 23 options:

	a) True
	b) False

Question 24(1 point)

If a hypothesis test rejects the null hypothesis using an alpha level ofa = .05, then the research report would include the statement "p > .05."

Question 24 options:

	a) True
	b) False

Question 25(1 point)

If all other factors are held constant, increasing the sample size fromn = 25 ton = 100 will increase the power of a statistical test.

Question 25 options:

	a) True
	b) False

Question 26(1 point)

For an independent-measures t statistic, you typically must compute the pooled variance before calculating the estimated standard error.

Question 26 options:

	a) True
	b) False

Question 27(1 point)

A Type II error occurs when a researcher concludes that a treatment has an effect but, in fact, the treatment has no effect.

Question 27 options:

	a) True
	b) False

Question 28(1 point)

It is possible for a very small treatment effect to be a statistically significant treatment effect.

Question 28 options:

	a) True
	b) False

Question 29(1 point)

In most situations, researchers would like the hypothesis test to reject the null hypothesis.

Question 29 options:

	a) True
	b) False

Question 30(1 point)

In a research report, the termsignificant result means that the null hypothesis was rejected.

Question 30 options:

	a) True
	b) False

Question 31(1 point)

A sample ofn = 9 scores is selected from a population with = 50 ands = 12. The probability of obtaining a sample mean greater than 46 is p = 0.8413.

Question 31 options:

	a) True
	b) False

Question 32(1 point)

If other factors are held constant, the larger the difference between the two sample means is, the greater the likelihood that the independent-measures t test will find a significant difference.

Question 32 options:

	a) True
	b) False

Question 33(1 point)

In order for the distribution of sample means to be normal, it must be based on samples of at leastn = 30 scores.

Question 33 options:

	a) True
	b) False

Question 34(1 point)

According to the central limit theorem, the standard error for a sample mean becomes smaller as the sample size increases.

Question 34 options:

	a) True
	b) False

Question 35(1 point)

If other factors are held constant, as the sample size increases, the estimated standard error decreases.

Question 35 options:

	a) True
	b) False