A Public Health Researcher Wants to Use Regression to Predict $\quad \mathrm { y } =$

question 12

Multiple Choice

A public health researcher wants to use regression to predict the sun safety knowledge of pre-school children. The researcher randomly sampled 35 preschoolers, assigned them to one of two groups, and then measured the following three variables: SUNSCORE: $\quad \mathrm { y } =$ Score on sun-safety comprehension test
READING: $\quad \mathrm { x } _ { 1 } =$ Reading comprehension score
GROUP: $\quad x _ { 2 } = 1$ if child received a Be Sun Safe demonstration, 0 if not
A regression model was fit and the following residual plot was observed.

Which of the following assumptions appears violated based on this plot?

• A) The errors are normally distributed
• B) The mean of the errors is zero
• C) The errors are independent
• D) The variance of the errors is constant

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Definitions:

Monitoring Task Accomplishments

The process of observing and recording the progress made on specific tasks within a project or operation.

Corrective Action

A process or an action taken to fix a detected problem or deviation from a set standard in an organization.

Uncertain Future

pertains to the unpredictability of events, developments, or outcomes in times ahead.

Performance Pressures

The demands or stress placed on individuals or organizations to achieve high levels of output or success.