QUESTION 1

1. What type of variable is the result from the following survey question?

Your age, select one of the following categories.

Less than 18

18 to less than 40

40 to less than 60

60 or above

A.Categorical

B.Quantitative

5 points

QUESTION 2

What type of variable is systolic blood pressure of adults, in mm Hg?

A.Quantitative Variable

B.Categorical Variable

5 points

QUESTION 3

A team of researchers is conducting survey for public health research. Several variables were observed from subjects participated in the survey. They are race, gender, height (in inches), weight (in pounds), and age (in years). Check the following statements that are correct statements. (There are more than one correct answers.)

A.Weight (in lbs) is data of nominal scale.

B.Race is data of ratio scale

C.Age (in years) is data of interval scale.

D.Gender is data of nominal scale

5 points

QUESTION 4

A researcher randomly selected several schools in Ohio and try to survey all students in these selected schools. What sampling method was the researcher using?

A.Stratified sample.

B.Cluster sample.

C.Simple random sample.

D.Voluntary response sample.

5 points

QUESTION 5

The sitting pulse rates per minute for a sample of four individuals are: 60, 65, 77, 69, 66. What is the sample standard deviation of this sample?

A.67.4

B.2.33

C.6.27

D.39.3

5 points

QUESTION 6

In a study of correlation between TWO numeric (quantitative) variables, which of the following is the proper statistics?

A.Cluster Bar Chart

B.Histogram

C.Normality Test

D.Scatter Plot

5 points

QUESTION 7

It is reported that the z-score (or standard score) of the test score of an individual from a certain population is -2. What does this imply?

A.This person's test score is two standard deviation below the average.

B.This person's test score is -2.

C.This person's test score is above average.

D.This person's test score is negative.

5 points

QUESTION 8

A data collected from young kids on there hours of exercise per week from a community:

3 4 6 10 10 6 11 12

What is the median?

A.9

B.10

C.8

D.12

5 points

QUESTION 9

A normality test was run on a sample of 20 data values and the p-value for the normality test was .07. What would be the proper conclusion for this test?

A.At 5% level of significance, there is sufficient evidence to support that the distribution of the sampled population is not likely normal.

B.The p-value is not less than 0.05 so the sampled population is likely normally distributed at 5% level of significance.

C.The p-value is not less than 0.05 so the data was likley not normally distributed, at 5% level of significance.

D.The p-value is not less than 0.05 so the data is not sufficient for understanding the normality of a distribution.

QUESTION 11

1. Which of the following charts is best for examining the distribution of ONE categorical variable, such as Gender of college students?

A.Pie Chart

B.Boxplot

C.Cluster Bar Chart

D.Histogram

5 points

QUESTION 12

1. In a population of 3,000 people, 300 of them are of high risk of getting heart disease. If one individual is chosen at random from this population, the probability that this person arenotof high risk of getting heart disease is
2. A..05
3. B..95
4. C..10
5. D..90

5 points

QUESTION 13

In population A, 40% are smokers. Also, it is known that 10% of the population A are smokers and do not exercise regularly. If a smoker is randomly selected from the population A what is the probability he or she does not exercise regularly?

A..30

B..04

C..10

D..25

QUESTION 15

It is reported in a study that the sensitivity of a mammogram as a screening test for detecting a breast cancer is 90%, and the specificity is 85%. The prevalence of the breast cancer is estimated to be 10%. What is the predictive value of a positive test? (Or say, if a person is tested positive, what is the probability that this person has breast cancer?)

A..11

B..4

C..34

D..82

5 points

QUESTION 16

1. A recent study on teenage pregnancy indicates that 10% of a very large female population will get pregnant sometime in their teenage years. The study stated that teenage pregnancies occur independently of one another. Suppose 6 teenage women were randomly selected. Find the probability that at least one of these 6 women will get pregnant some time in their teenage years. (Choose closest answer.)

A.41%

B.33%

C.65%

D.47%

5 points

QUESTION 17

1. Which of the followings is the best descriptive statistic for describing distribution of a categorical variable?

A.Sample Mean

B.5-number Summary

C.Sample Standard Deviation

D.Relative Frequency Distribution

5 points

QUESTION 18

1. Suppose that the mean and the standard deviation of weight of certain ethnic group of people that are five foot tall are: mean = 150 and standard deviation = 4. If we assume that the distribution of weight is normally distributed, what is the 90-th percentile in this weight distribution? (Select one value below that is the closest to the answer.)

A.156.3

B.154.2

C.160.1

D.145.8

5 points

QUESTION 19

1. Suppose that the mean and the standard deviation of BMI (Body Mass Index) of certain ethnic group of people is normally distributed with a mean = 25 and standard deviation = 3. What proportion of the people of this ethnic group will have BMI above 27?

A.89.4%

B.74.8%

C.25.2%

D.30.9%

5 points

QUESTION 20

1. If there are outliers in a sample, which of the followings is true?

A.Sample mean would be greater than sample median.

B.Sample standard deviation would be larger than expected (larger than if there were no outliers).

C.Sample median would be greater than sample mean.

D.Sample standard deviation would be smaller than expected (smaller than if there were no outliers).