1 of50

Statistics is concerned with the study of data.

	True
	False

Question

2 of50

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

	True
	False

Question

3 of50

A researcher wants to estimate the average shoe size of 30-year-old men in Arizona. The shoe size of the men is considered a:

	Population
	Parameter
	Sample
	Statistic

Question

4 of50

Distinguish between qualitative and quantitative variables.

Frank was completing a questionnaire for a research study at a hospital he works for. One of the questions asked for the number of pets he owns. This is an example of what type of variable?

	Qualitative
	Quantitative-discrete variable
	Quantitative- continuous variable
	Independent

Question

5 of50

Ethnicity box on an application is an example of which scale of measurement?

	nominal
	ordinal
	interval
	ratio

Question

6 of50

Dr. Shelly Cantin is a psychopharmacologist who believes that she has developed an effective drug to enhance memory. To test her new drug, she gives a single dose of the compound to 15 volunteers. She allows the drug 20 minutes to take effect. Then, she asks the subjects to memorize a list of 40 Latin nouns. She then records how many words each subject correctly memorized. She also followed the same procedure with 15 people that did not take the drug first. Finally, she compared her results between the two groups and found that the average recall was far higher for those that took the drug versus those that did not take the drug. She concludes that her drug did indeed enhance their memories. What is the sample in this study?

	Dr. Cantin
	The students taking the drug
	The students not taking the drug
	All students that participated in the study.
	All people in the world

Question

7 of50

A numerical description of a population characteristic is a

	variable
	generalization
	statistic
	parameter

Question

8 of50

"Statistics" refers to a range of techniques and procedures for analyzing, interpreting, displaying, and making decisions based on data.

	True
	False

Question

9 of50

The Quality Assurance Department of a local nursing home is attempting to monitor and evaluate clients' satisfaction with the nursing home services. A random sample of clients are asked to fill out a questionnaire to rates the services provided such as recreation, medical care, food, cleaning, and outings. The Quality Assurance Department puts together reports and presents them to the Board of Directors meetings with really extraordinary and unusual ratings flagged. They are going to use this information to predict what all of their customers' experiences are and to find ways to improve their services. In this Nursing Home Study, the process of using sample information for predictions, forecasts, and estimates is called:

	Inferential statistics
	Descriptive statistics
	Sampling
	Probability

Question

10 of50

The lie factor refers to

	incorrect inferences.
	an error scale.
	using charts to misrepresent data.
	using charts that only support one side of a discussion.

Question

11 of50

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

	Yes
	No

Question

12 of50

The box plot below shows weekly spending on groceries.

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

	25%
	50%
	75%
	100%

Question

13 of50

In a grouped frequency distribution, empty classes should be avoided.

	True
	False

Question

14 of50

Outliers in data should usually be disregarded.

	True
	False

Question

15 of50

Cumulative frequency is expressed as a ______, while relative frequency can be expressed as a ______.

	percentage, count
	ratio, number
	count, proportion
	range, percentile

Question

16 of50

What kind of graph is this?

	frequency histogram
	ogive
	frequency polygon
	frequency distribution

Question

17 of50

In comparing frequency tables with grouped frequency tables for the same set of data, which of the following would be true?

	Depending on the width of class intervals it is possible that some scores may not be counted in a grouped frequency table.
	If the data set is large the grouped frequency table would be easier to decipher.
	Because of overlapping class intervals, the total frequency for a grouped frequency table would exceed that of a frequency table.
	It is generally harder to spot patterns in the data when using a grouped frequency table.

Question

18 of50

Bar charts are best used with qualitative data.

	True
	False

Question

19 of50

A data set can have more than one mode.

	True
	False

Question

20 of50

Determine the population standard deviation of the data set below: 24, 12, 22, 29, 26, 14

	8.6
	6.2
	9.1
	8.8

Question

21 of50

Determine the shape of the distribution shown below.

	Bell Shaped
	Right Skewed
	Uniform
	Left Skewed

Question

22 of50

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

23 of50

If I wanted to determine what a typical employee working for a large company makes (salary wise), should I ask Human Resources for the mean salary or the median salary?

	median salary
	mean salary

Question

24 of50

Determine the shape of the distribution shown below.

	Left Skewed
	Uniform
	Right Skewed
	Bell Shaped

Question

25 of50

The median represents

	the arithmetic average of the data.
	the value in the middle of the data.
	the most frequently occurring value.

Question

26 of50

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

	119
	139
	118
	119.2

Question

27 of50

The value of r should be reported in terms of the units in which the variables are being measured.

	True
	False

Question

28 of50

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

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

	Yes
	No

Question

29 of50

The Pearson correlation can be calculated for

	monotonic data
	not-monotonic data
	either monotonic or not-monotonic data
	only linear data

Question

30 of50

The Pearson correlation requires

	ordinal level data.
	ordinal or interval level data.
	interval or ratio level data.

Question

31 of50

The Spearman correlation requires

	ordinal level data.
	ordinal or interval level data.
	interval or ratio level data.

Question

32 of50

A study reported an r of .5 for data relating illicit drug use as the predictor variable to early death syndrome as the response variable. Interpret this.

	A correlation of .5 is very strong; it appears cannabis use causes early death.
	A correlation of .5 is moderate; it appears cannabis use may cause early death.
	A correlation of .5 is weak; cannabis probably does not cause early death.
	A correlation of .5 is moderate; there appears to be a relationship but the nature of the relationship is not specified.

Question

33 of50

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

34 of50

The Spearman correlation can be calculated for

	monotonic data
	not-monotonic data
	either monotonic or not-monotonic data
	only linear data

Question

35 of50

P(A|B) represents the probability that

	A or B occurs
	A and B occur
	B occurs given that A has occurred
	A occurs given that B has occurred

Question

36 of50

Which of the following is not a correct statement about a probability?

	It must have a value between 0 and 1.
	It can be reported as a decimal or a fraction.
	A value near 0 means that the event is not likely to occur.
	It summarizes the sample space of an experiment.

Question

37 of50

The multiplication rule is sometimes referred to as

	probability "or"
	probability "and"

Question

38 of50

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

	union
	intersection

Question

39 of50

If the occurrence of one event means that another cannot happen, then the events are

	Independent
	Mutually Exclusive
	Impossible
	Empirical

Question

40 of50

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

	union
	intersection

Question

41 of50

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

	{2, 4, 6, 8}
	{ }
	{1}
	(2,4,6)

Question

42 of50

Which selection represents the intersection of the two sets {2,3,4,5,6,9} and {5,6,7,8}?

	{5,6}
	{2,3,4,5,6}
	(7,8)
	{2,3,4,5,6,7,8,9}

Question

43 of50

Decide whether the experiment is a binomial experiment. Testing a pain reliever using 840 people to determine if it is effective. The random variable represents the number of people who find the pain reliever to be effective.

	binomial experiment
	not a binomial experiment

Question

44 of50

Which of the following variable(s) would be considered a discrete random variable? (Select all that apply)

	The number of students who bring their lunch to school instead of eating what the cafeteria serves.
	The number races a race car driver competes in during a given year.
	The average speed of a race car during a given race.
	The time it takes a student to finish his/her lunch.

Question

45 of50

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

46 of50

Which of the following is not a condition of the binomial distribution?

	only 2 possible outcomes
	have a constant probability of success
	Must have at least 3 trials
	trials must be independent

Question

47 of50

If the probability of x successes in n trials is less than ___% the event can be considered unusual.

	10
	1
	4
	5

Question

48 of50

State whether the variable is discrete or continuous. The cost of a statistics textbook

	discrete
	continuous

Question

49 of50

InterpretP(x) = .037

	It is just a formula.
	x = .037
	P= .037 / x
	The probability of obtaining the outcome denoted by x is 3.7%

Question

50 of50

A listing of the possible outcomes of an experiment and their corresponding probability is called

	Random Variable
	Contingency table
	Probability Distribution
	Frequency Distribution