Twenty-Eight Applicants Interested in Working for the Food Stamp Program

question 90

Short Answer

Twenty-eight applicants interested in working for the Food Stamp program took an examination designed to measure their aptitude for social work. A stem-and-leaf plot of the 28 scores appears below, where the first column is the count per "branch," the second column is the stem value, and the remaining digits are the leaves.
a. Should the Empirical Rule be applied to this data set?
______________
b. Use the range approximation to determine an approximate value for the standard deviation.
______________
Is this a good approximation?
______________

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Definitions:

Dependent Variables

Variables in an experiment or model whose values are expected to change as a result of changes in other variables.

Indicators

Variables or metrics used to assess a specific aspect or condition within a study or analysis.

Durbin-Watson Statistic

A test statistic used to detect the presence of autocorrelation at lag 1 in the residuals from a regression analysis.

Multicollinearity

A statistical phenomenon in which two or more predictor variables in a multiple regression model are highly correlated, making it difficult to distinguish their individual effects.