1. Which statistic may be used to summarize a set of categorical data?
A) Percent in each category
B) Median
C) Mean
Feedback: Mean and median are statistics that describe a quantitative data set. The percent that falls in each category can be used to describe a categorical data set.
Points Earned: 0.0/1.0
Correct Answer(s): A
2. In order to employ the Empirical Rule which one of the following is true?
A) The data needs to be Empirical.
B) The data needs to be bell shaped
C) The data needs to be normal
D) The Empirical Rule works for any data set.
Feedback: The data needs to be bell shaped. Normal is a specific type of bell shaped distribution, but is not necessary to employ the Empirical Rule.
Points Earned: 1.0/1.0
Correct Answer(s): B
3. A study was done at Penn State to determine the attitudes students have regarding students carrying guns on campus. The study design involved randomly selecting 50 students from each class standing: Freshman, Sophomore, Junior, Senior, and Graduate. The design BEST describes which sampling method?
A) Stratified
B) Simple Random
C) Cluster
D) Convenience
Feedback: Randomly selecting from each class standing, or strata, would be an example of stratified random sampling.
Points Earned: 1.0/1.0
Correct Answer(s): A
4. When graphing categorical data, which of the following graphs would be MOST appropriate?
A) Box plot
B) Pie Chart
C) Histogram
D) Stem and Leaf
Feedback: Except for the pie chart, all other graphs are for quantitative data.
Points Earned: 1.0/1.0
Correct Answer(s): B
5. What observed height would have a z-score of zero?
A) 65
B) 69
C) 73
D) 0
Feedback: For a z-score of 0 we would find the observed height using the equation: observed equals z-score times SD plus mean. A z-score 0 times 4 would be 0, and adding this to a mean of 69 would simply be 69. Or, if you recall that z-scores represent the number of standard deviations an observed score is from the mean then a z-score of 0 would mean the observation was zero standard deviations from the mean thus the observed value would be the mean.
Points Earned: 1.0/1.0
Correct Answer(s): B
6. Approximately what percent of male heights are between 65 inches and 73 inches?
A) 99.7
B) 95
C) 68
D) 50