Question 7 2 pts

A researcher randomly selects and interviews fifty male and fifty female teachers. This sampling technique is called:

Random, Convenience, Cluster, Stratified

Question 8 2 pts

A researcher obtained a random sample of 100 smokers and a random sample of 100 non-smokers. After interviewing all 200 participants, the researcher compared the rates of depression between the two groups. This study design would be considered:

Observational, Experimental,Simulation,Survey

Question 9 2 pts

Which of the following would be the mean of this data set: 5, 7, 12, 56, 4, 2, 33, 21

140.0,18.7,17.5,8.0

Question 10 2 pts

Which of the following would be the standard deviation of this sample data set: 67, 54, 30, 77, 92, 41, 75, 81

64.6, 517.0, 21.2, 19.9

Question 11 2 pts

Which of the following would be the variance of this population data set: 3, 9, 8, 9, 4, 5, 7, 11, 9, 7, 5, 4, 3, 1

2.92, 7.92, 2.81, 8.53

Question 12 2 pts

What is the relationship between variance and standard deviation?

Variance is the square of the standard deviation

Standard deviation is the square of the variance

Variance is double the standard deviation

Standard deviation is double the variance

Question 13 2 pts

If data set A has a smaller standard deviation than data set B, what would be different about their distributions?

Data set A would have more data near the center of the distribution

Data set A would have most of its data to one side of the distribution

Data set A would have flatter distribution with more data in each tail

Data set A would have a larger mean

Question 14 2 pts

In a normally distributed data set with a mean of 24 and a standard deviation of 4.2, what percentage of the data would be between 19.8 and 28.2 and why?

68% based on the Empirical Rule

95% based on the histogram

68% based on the histogram

95% based on the Empirical Rule

Question 15 2 pts

Which of the following data sets would you expect to have the highest standard deviation?

Weight of an orange (in ounces)

Ages of people taking college classes (in years)

The number of phones a person owns

Amount of soda in an unopened can (in ounces)

Question 16 2 pts

Which data outcome of the speed of cars would best support removing a speed camera?

High mean with high standard deviation

Low mean with high standard deviation

High mean with small standard deviation

Low mean with low standard deviation

Question 17 2 pts

In manufacturing, cluster sampling could be used to determine if the machines are operating correctly. Which of the following best describes this type of sampling?

Samples are randomly selected throughout the day

Products are put into groups and some are randomly selected from each group

Products are put into groups and all are included from several randomly selected groups

Every 10th product in the line is selected

Question 18 2 pts

A graph shows the ten's digit on the left and the one's digits on the right. This graphic is most likely to be:

A dot plot

A stem-leaf plot

A frequency histogram

A frequency polygon