Lecture Exam 1

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Question #1

Below is a set of observations representing the number of years between first infection with HIV to AIDS diagnosis from a sample of 8 infected individuals in Los Angeles County.
9, 14, 12, 16, 14, 19, 20, 24

Which of the following choices indicates the standard deviation of the set of observations above?

A 4.8

B 4.5

C 20.3

D 16.4

E 23.1

Question #2

Which of the following choices indicates the variance of the set of observations above?

A 16.4

B 23.1

C 4.5

D 4.8

E 20.3

Question #3

Which of the following choices indicates the mean of the set of observations above?

A 18.3

B 16

C 14.5

D 15

E 20

Question #4

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below.
17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19

Which of the following choices indicates the interquartile range (IQR) of the list of observations above?

A 45

B 23

C 30

D 11

E 19

Question #5

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below.
17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19

Which of the following choices indicates the range of the list of observations above?

A 16

B 49

C 18

D 30

E 60

Question #6

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below.
17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19

Which of the following choices indicates the median of the list of observations above?

A 19

B 27

C 21

D 32

E 24

Question #7

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below.
17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19

Which of the following choices indicates the mode of the list of observations above?

A 30

B 16

C 27

D 65

E 19

Question #8

The ages of a sample of 14 people who had gotten in a car accident in the last month were collected. The 14 observations are presented below.
17, 20, 65, 27, 30, 32, 21, 34, 28, 19, 19, 16, 27, 19

Which of the observations above would be considered an outlier?

A 20

B 16

C 65

D 17

E 30

Question #9

Researchers attempt to draw a histogram, depicting data on the number of reported children from a sample of health department employees. Which of the following pieces of advice would you give them to correct errors in their attempted graph below?

A Since the intended graph is a histogram, there should not be any gaps between adjacent bars.

B The X and Y axis should be labeled appropriately.

C The bars of the graph should not have different widths.

D All of the listed choices are correct.

Question #10

Which frequency distributions are NOT appropriate to use with nominal data?

A Cumulative frequency distributions

B Relative frequency distributions

C All of the listed choices are appropriate to use with nominal data

D Standard frequency distributions (displaying frequencies of observations in each group

Question #11

A researcher wants to conduct a study measuring factors that affect a healthy lifestyle among US residents, with study variables assessing daily diet, amount exercise per week and how many times per week an individual consumes fast food. The researcher decides to recruit a sample of participants to collect data from by standing outside a gym in a suburb of Los Angeles and asking people passing by if they would be willing to participate in her study and complete her developed questionnaire.
Would her chosen method of sampling be the best way to obtain a representative sample of her target population of all US residents?

A No — her chosen method would NOT be the best way of obtaining a representative sample of US residents.

B Yes — her chosen method would be the best way of obtaining a representative sample of US residents.

Question #12

Would state of residence (e.g., California, Florida) best be described as a qualitative or quantitative variable?

A Quantitative

B Qualitative

Question #13

The following graph shows the distribution of length of patient stays in a local hospital over the last year. Most people stay only a few days, with a small number of people staying over 30 days. Which value would you expect to be larger (i.e., a higher number of days)?

A The median length of stay

B The mean length of stay

Question #14

The following graph shows the distribution of length of patient stays in a local hospital over the last year. Most people stay only a few days, with a small number of people staying over 30 days. Is the shape of this distribution normal, positively skewed, negatively skewed, or bimodal?

A Normal

B Bimodal

C Positively skewed

D Normal

Question #15

A researcher asks each of 5 study participants how many extended family members they have who have ever been diagnosed with heart disease (for example, 1 family member or 4 family members). Would this variable best be described as discrete or continuous?

A Discrete

B Continuous

Question #16

Using data from a sample of 1,000 patients as evidence, a researcher claims that the average systolic blood pressure of residents of the state of California is 118. Would this best be described as descriptive or inferential statistics?

A Descriptive

B Inferential

Question #17

The mean of each of the following two samples of observations is 5.
Sample A: 4, 4, 4, 5, 5, 6, 6, 6
Sample B: 0, 0, 1, 5, 7, 8, 9, 10

A Sample B

B Sample A

Question #18

Which of the following measures is NOT sensitive to extreme observations?

A The mean

B All of the listed measures are sensitive to extreme observations

C The range

D The interquartile range (IQR)

Question #19

Someone’s major of study (e.g., psychology, biology) at CSUN is an example of what level of measurement?

A Nominal

B Interval/Ratio

C Ranked

D Ordinal

E All of the above

Question #20

A researcher distributes a nutritional questionnaire to 100 survey participants and collects their responses. For which of the following collected variables would it be most appropriate to calculate the mean:

A Number of calories consumed daily

B Type of food eaten for breakfast that day

C County of residence

D Gender

E It is appropriate to calculate the mean for all of the above variables

Question #21

Which of the following best represents an example of randomization (random assignment) in a research study?

A Participants in a sexual health study select for themselves whether they would like to be in a group receiving health education or a group receiving free contraceptives.

B Researchers randomly choose half of the study participants to be in a group receiving a new drug and half of the study participants to be in a group not receiving the new drug.

C A researcher gives all study participants new eye drops and asks each if the new drops have improved the participants’ dry eyes

D Researchers stand in the entrance to a grocery store and ask random people passing by if they would complete a survey.

E Researchers randomly select people admitted to a local hospital to complete a questionnaire.

Question #22

The probability that William will draw a blue marble from a bag of marbles is 1.0 (in decimal form). This indicates:

A It is impossible for an event to have a probability of 1.0

B It is unlikely that William will draw a blue marble

C William definitely WILL NOT draw a blue marble

D William definitely WILL draw a blue marble

E William has a 50% chance of drawing a blue marble

Question #23

A researcher collects information on the name of study participants’ health insurance coverage (e.g., Kaiser, Blue Cross, United). When graphing the frequencies reported for each of the different health insurance company names, it would be most appropriate for the researcher to use a histogram.