Ch 02 & 03

Correlation is useful only for: a. measuring the strength of a linear relationship b. automatically calculating covariances c. measuring the strength of a nonlinear relationship d. conveying the same information in a simpler format than a scatterplot e. assessing the weakness of a linear relationship

a. measuring the strength of a linear relationship

Categorizing age variables as "young," "middle-aged," and "elderly" is an example of: a. counting b. binning c. ordering d. categorizing e. value adding

b. binning

The average score for a class of 30 students was 75. The 20 male students in the class averaged 70. The 10 female students in the class averaged: a. the same as the males b. higher than the males c. significantly lower than the males d. little lower than the males

b. higher than the males

In order for the characteristics of a sample to be generalized to the entire population, the sample should be: a. symbolic of the population b. representative of the population c. illustrative of the population d. atypical of the population

b. representative of the population

In a generic box plot, the vertical line inside the box indicates the location of the: a. mode b. mean c. median d. maximum value e. minimum value

c. median

The tool that provides useful information about a data set by breaking it down into categories is the: a. histogram b. scatterplot c. pivot table d. spreadsheet

c. pivot table

If the mean is 75 and two observations have values of 65 and 85, what is the squared deviation of each? a. 400 b. 20 c. 10 d. 100

d. 100

The daily closing values of the Dow Jones Industrial Average over a period of 30 days are best described as _____ data. a. discrete b. nominal c. cross-sectional d. time-series

d. time-series

A line or curve superimposed on a scatterplot to quantify an apparent relationship is known as a(n): a. positive variable b. data point c. average d. slope e. trend line

e. trend line