Question 1

The two properties about a set of measurements of a dependent variable that we are most interested in describing are:

Question 1 options:

	frequency and average.
	average and correlation.
	central tendency and dispersion.
	histograms and polygons.

Question 2

The ________________ is the sum of all the scores divided by the number of scores.

Question 2 options:

	median
	mean
	mode
	standard deviation

Question 3

The generally preferred measure of central tendency is usually the

Question 3 options:

	range
	mean
	standard deviation
	median

Question 4

Which of the following is the most useful descriptive statistic for measuring dispersion?

Question 4 options:

	range
	variance
	mean deviation
	standard deviation

Question 5

The standard deviation is

Question 5 options:

	the square of the variance.
	the square root of the variance.
	smaller than the mean.
	the difference between the highest and lowest scores.

Question 6

If the mean I.Q. is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will have a z score (or standard score) of

Question 6 options:

	1.00
	0.00
	2.00
	-2.00

Question 7

Inferential statistics allow you to decide whether a difference between the experimental and the control group is due to _______________ or ________________.

Question 7 options:

	manipulation; chance
	manipulation; experimental error
	sampling error; independent variable
	independent variable; experimental error

Question 8

The null hypothesis suggests that the two samples come from ___________ distribution(s), and the experimental hypothesis suggests that the two samples come from _____________ distribution(s).

Question 8 options:

	different; different
	different; the same
	the same; different
	the same; the same

Question 9

The power of a statistical test refers to its ability to

Question 9 options:

	reject false null hypotheses.
	reject false experimental hypotheses.
	reject true null hypotheses.
	reject true experimental hypotheses.

Question 10

Simple analysis of variance is used in designs having

Question 10 options:

	one independent variable
	more than one independent variable
	more than one independent variable (IV) but less than four IVs
	more than one dependent variable

Question 11

The number of participants in a study is denoted by

Question 11 options:

	s.
	n.
	z.
	r.

Question 12

A _____________ is a complete set of measurements.

Question 12 options:

	sample
	population
	random sampling
	parameter

Question 13

_____________ is one way of ensuring that a sample is representative of the population.

Question 13 options:

	The two-tailed test
	The between-subjects design
	The sign test
	Random sampling

Question 14

If we conduct an experiment on average young, white, college males, inferential statistics allow us to generalize to the population of

Question 14 options:

	average young, white, college males.
	college male students.
	college students.
	young adults.

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Question 15

If we apply an alpha level of .05, and there really is no effect of the experimental manipulation, then one should make

a Type I error

Question 15 options:

	5% of the time.
	10% of the time.
	15% of the time.
	95% of the time.

Question 16

Which of the following would be considered the most conservative alpha level?

Question 16 options:

	.01
	.05
	.10
	.15

Question 17

The prediction that alcohol slows reaction time is

Question 17 options:

	nondirectional.
	directional.
	semidirectional.
	partially directional.

Question 18

Two-tailed tests are _______________ conservative and ______________ powerful than one-tailed tests.

Question 18 options:

	less; less
	less; more
	more; less
	more; more

Question 19

The _____________ indicates the number of scores that are free to vary.

Question 19 options:

	U
	degrees of freedom
	magnitude of effect
	point biserial

Question 20

The ____________ is used to analyze the results when there are more than two groups.

Question 20 options:

	t-test
	z-test
	analysis of variance
	none of the above

Question 21

The __________ maintains that two conditions do not differ.

Question 21 options:

	experimental hypothesis
	level of confidence
	law of effect
	null hypothesis

Question 22

A conservative statistical test is one that

Question 22 options:

	minimizes both Type I and Type II errors.
	minimizes Type I errors, but increases the chance of Type II errors.
	minimizes Type II errors, but increases the chance of Type I errors.
	increases the chance of both Type I and II errors.

Question 23

What are inferential statistics used for?

Question 23 options:

	summarize the mean and standard deviation of the data
	estimate if differences between groups are by chance
	describe the data from 2 unrelated groups
	describe the relationship within a set of data

Question 24

Descriptive statistics are used to:

Question 24 options:

	compare the signficance of the difference between 2 data sets
	test the difference between the means
	describe the observations
	describe the type one error in an experiment

Question 25

Which of the following is not a characteristic of the normal curve:

Question 25 options:

	bell-shaped
	represents 100% of the scores under the curve
	100 is at the center
	allows us to determine rank