Characteristics possessed by experimental units are called:
a. data sets
b. descriptive statistics
c. internal data
d. variables
Q. 2Survey your friends about the number of siblings they have and the length of the last phone call they had with their boyfriend / girlfriend. Identify the two random variables of interest and list their possible values.
Q. 3Which of the following statements is true?
a. Univariate data result when a single variable is measured on a single experimental unit.
b. Bivariate data result when less than two variables are measured on a single experimental unit.
c. Multivariate data result when more than two variables are measured.
d. Both univariate data result when a single variable is measured on a single experimental unit and multivariate data result when more than two variables are measured are true.
e. Both bivariate data result when less than two variables are measured on a single experimental unit and multivariate data result when more than two variables are measured are true.
Q. 4Are you getting a summer job? A recent study reported that 68 of college students answered, I have one; 22 said Maybe and 10 said No. Is the variable in question 28 a random variable? Explain.
Q. 5The two graphical techniques we usually use to present qualitative data are:
a. bar chart and histogram
b. histogram and pie chart
c. bar chart and pie chart
d. line chart and stem and leaf plot
e. bar chart and line chart
Q. 6Are you getting a summer job? A recent study reported that 68 of college students answered, I have one; 22 said Maybe and 10 said No. What is the variable involved, and what are the possible values?
Q. 7The sum of the frequencies for all classes will always equal:
a. the number of classes
b. the class width
c. the total number of observations in the data set
d. one
e. the average
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