Answered: A researcher is interested in the…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section4.5: Correlation And Causation

Problem 11PPS

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A researcher is interested in the impact of joining a weight loss program in the past 12 months on the individuals weight loss. The analysis was restricted to people aged 16 and older who answered yes to the question "During the past 12 months, have you tried to lose weight?" About 5% of the sample had joined a weight loss program in the past year?

Subset of variables included in the survey. Questions were asked about actions taken in the past 12 months.

Which ones do you believe should be included as covariates? provide a justification.

AGE

BMI

GENDER

HEIGHT

AVERAGE MINUTES OF EXERCISE PER WEEK

WHETHER THEY TRIED TO EAT LESS CALORIES

WHETHER THEY TRIED TO EAT LESS FAT

WHETHER THEY TRIED TO EAT LESS CARBS

Definition Definition Measure of how two random variables change together. Covariance indicates the joint variability or the directional relationship between two variables. When two variables change in the same direction (i.e., if they either increase or decrease together), they have a positive covariance. When the change is in opposite directions (i.e., if one increases and the other decreases), the two variables have a a negative covariance.

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