1of 50

When conducting research, descriptive statistics are completed before inferential statistics.

True

False

Question

2of 50

If you are doing a study on the amount of money students have in debt out of college versus how much money they have when they reach retirement age, you will be using what type of scale?

Nominal

Ordinal

Interval

Ratio

Question

3of 50

Give examples of discrete and continuous variables.

Discrete variables can be

measured but not counted

counted but not measured

both measured and counted

neither measured nor counted

Question

4of 50

A researcher wants to estimate the average shoe size of 30-year-old men in Arizona. From a random sample of 50 men, the researcher obtains an average show size of 10.5. The average shoe size of 10.5 is considered a:

Population

Parameter

Sample

Statistic

Question

5of 50

Professor Frust was conducting a research experiment on student satisfaction with campus professors. He passed out surveys to all of the professors on campus to give to their students. However, he found that only a very small percentage of students actually completed the survey and returned it. This is an example of:

Non-response

Sampling error

Overgeneralization

Cause and effect

Question

6of 50

Sunday's forecasted temperature is an example of which scale of measurement?

nominal

ordinal

interval

ratio

Question

7of 50

When this course is over, you will be asked to complete a survey about your satisfaction with the course. It will ask you to choose between four responses (very dissatisfied," "somewhat dissatisfied," "somewhat satisfied," or "very satisfied"). This type of measurement is called:

Nominal

Ordinal

Interval

Ratio

Question

8of 50

A clinical researcher wants to be sure that her data includes test results from ethnic groups in proportion to their presence in the population she is drawing participants from. What sampling method should she use?

Random sampling

Stratified sampling

Cluster sampling

Convenience sampling

Systematic sampling

Question

9of 50

The population is all of the United States citizens that are voting age. Selecting a random sample of people in California would be a sample.

True

False

Question

10of 50

Imagine a researcher found that 65% of bystanders helped a female who dropped her packages but only 32% helped a male that dropped his packages. What type of graph would be appropriate to display this data?

Bar graph

Frequency polygon

Histogram

Not enough information is available to answer the question.

Question

11of 50

The box plot below shows weekly spending on groceries.

What percentage of the data is between $40 and $90?

25%

50%

75%

100%

Question

12of 50

What is a data entry that is far removed from the other entries in the data set?

Outlier

Inlier

Weighted Mean

Frequency

Question

13of 50

Scores from a quiz are recorded and are presented in a frequency table. What type of graph should be used to present the quiz scores?

Pie chart

Histogram

Polygon

Scatterplot

Question

14of 50

ClassesNumber of scores

10-186

19-279

28-3612

37-458

46-547

Based on the frequency distribution above, the frequency for the class with upper class limit 27 is:

9/42

42%

27%

9

Question

15of 50

ClassesNumber of scores

10-186

19-279

28-3612

37-458

46-547

Based on the frequency distribution above, the cumulative frequency for the class with upper class limit 27 is:

6

27

15

9

Question

16of 50

Can there be more than one outlier in a data set?

Yes

No

Question

17of 50

If your professor says that the median score on the previous test was 65, what does that tell you?

The average score was 65.

Half the scores were 65 and half were 65.

A score of 65 is at the 65th percentile.

Scores below 65 were failing grades.

Question

18of 50

If your professor says that the Q3 score on the previous test was 89, what does that mean?

33% of students in the class scored at or below 89 on the test.

25% of students in the class scored at or below 89 on the test.

75% of students in the class scored at or below 89 on the test.

3% of students in the class scored at or below 89 on the test.

Question

19of 50

A data set can have more than one mode.

True

False

Question

20of 50

Arthur has two children, Zeke and Lucy, who competed in a track meet. The results were as follows:

Zeke ran the 400 m event in 55.4 seconds. The mean time for all runners was 56.3 seconds and the standard deviation was 2.54 seconds.

Lucy ran the 200 m event in 26.4 seconds. The mean time for all runners was 27.2 seconds and the standard deviation was 1.25 seconds.

Who ran a better race, relatively speaking?

Lucy

Zeke

Question

21of 50

Determine the mean of the following data set: 139, 127, 139. 109, 111, 90, 119, 102, 117, 139

119

139

118

119.2

Question

22of 50

The algebraic sum of deviations from a mean is:

Maximum

Zero

Minimum

Undefined

Question

23of 50

The mean of a distribution is 23, the median is 21, and the mode is 19. It is most likely that this distribution is:

Positively Skewed

Symmetrical

Asymptotic

Negatively Skewed

Question

24of 50

Determine the median of the following data set: 139, 127, 139. 109, 111, 90, 119, 102, 117, 139

119

139

118

119.2

Question

25of 50

The mode represents

the arithmetic average of the data.

the value in the middle of the data.

the most frequently occurring value.

Question

26of 50

The middle value of an ordered array of numbers is the

Mode

Mean

Median

Mid Point

Question

27of 50

A scatter plot should always be constructed

soon after calculating a value for r.

prior to calculating a correlation value.

prior to submitting the results to a journal publisher.

when linearity is suspected.

Question

28of 50

Given the equation of a regression line is y = 3.5x + 11, what is the best predicted value for y given x = 4?

48

7

25

15

Question

29of 50

A scatter plot that rises continually but not at a constant rate is said to be

not-monotonic

un-linear

variously increasing

monotonic

Question

30of 50

Given the equation of a regression line is y = 2x - 5, what is the best predicted value for y given x = 10?

48

7

25

15

Question

31of 50

The correlation coefficient is independent of the scale of measurement of the variables.

True

False

Question

32of 50

Pearson's correlation is used to determine

linearity of the relationship between the variable.

causality of the relationship between the variables.

strength of the relationship between the variables

the ratio of x scores to y scores

Question

33of 50

Here is a scatter plot for a set of bivariate data.

Is the Pearson correlation coefficient an appropriate measure of the strength of the relationship shown by this data set?

Yes

No

Question

34of 50

The Spearman correlation can be calculated for

monotonic data

not-monotonic data

either monotonic or not-monotonic data

only linear data

Question

35of 50

In which approach to probability are the outcomes tracked over a series of trials?

Classical Probability

Empirical Probability

Subjective Probability

Question

36of 50

If two cards are chosen from a standard deck of cards, what is the probability of getting a five followed by a seven? (assume replacement of the first card)

1/13 * 1/13

1/13 * 1/12

1/13 + 1/13

+

Question

37of 50

In which approach to probability are the outcomes equally likely to occur?

Classical Probability

Empirical Probability

Subjective Probability

Question

38of 50

A Venn diagram

can be used to depict unions and intersections of events.

represents the outcomes of a statistical experiment

uses circles or ovals to represent events

a and c above

all the above

Question

39of 50

The set represented by "C and D" is the _____ of sets C and D.

union

intersection

Question

40of 50

If two cards are chosen from a standard deck of cards, what is the probability of first getting a diamond and then a club? (assume replacement of the first card)

1/13 * 1/13

1/13 * 1/12

1/13 + 1/13

+

Question

41of 50

Which group of data entries below does not represent a set?

{2, 4, 6, 8}

{ }

{1}

(2,4,6)

Question

42of 50

Suppose a jar contains 10 red marbles and 10 blue marbles. If you reach into the jar and pull out 2 marbles, find the probability that both are red.

.5

.25

.1

.24

Question

43of 50

Determine whether the distribution below represents a probability distribution.

x

P(x)

3

-.3

6

.5

9

.1

12

.3

15

.4

Is a probability distribution; the probabilities sum to 1.

Not a probability distribution; the probabilities do not sum to 1.

Not a probability distribution; a probability value cannot be negative.

Not a probability distribution; a probability cannot be greater than one.

Question

44of 50

Find the standard deviation of the binomial distribution for which n = 60 and p = .2.

3.1

.30

9.6

12

Question

45of 50

Find the mean of the binomial distribution for which n = 60 and p = .2.

48

30

60

12

Question

46of 50

The random variable x represents the number of boys in a family of three children. Assuming that boys and girls are equally likely, find the mean and standard deviation for the random variable x.

mean: 2.25; standard deviation: 0.76

mean: 1.50; standard deviation: 0.76

mean: 2.25; standard deviation: 0.87

mean: 1.50; standard deviation: 0.87

Question

47of 50

Decide whether the experiment is a binomial experiment. You observe the gender of the next 300 babies born at a local hospital. The random variable represents the number of girls.

not a binomial experiment

binomial experiment

Question

48of 50

Determine whether the distribution represents a probability distribution.

x

P(x)

1

.49

2

.05

3

.32

4

.07

5

.07

Is a probability distribution; the probabilities sum to 1.

Not a probability distribution; the probabilities do not sum to 1.

Not a probability distribution; a probability value cannot be negative.

Not a probability distribution; a probability cannot be greater than one.

Question

49of 50

State whether the variable is discrete or continuous. The speed of a car on a Phoenix freeway during rush hour traffic

discrete

continuous

Question

50of 50

Remember that random variables can be either discrete or continuous. Which of the following are continuous random variables? (select all that apply)

The distance a person has walked in a day

How many glasses of water a person consumes in a day

The number of steps a person has walked in a day

The time it takes someone to tie their shoes