5.) Decrease in physical activity is considered to be a major contributor to the

Question

5.) Decrease in physical activity is considered to be a major contributor to the increase in prevalence of obesity in the general adult population. Researchers have measured steps taken per day and body mass index for a SRS of 100 females. Use the following information to analyze the relationship. 90 r- -0.385 = 29.578-0.655x 1) What is the explanatory variable 2) What is the response variable? 3) Describe the form, direction, and strength of the scatterplot. 4) What is the correlation? a. Give the value. b. Looking at the Table in the book (A-5), what is the critical value for the correlation to be significant with =0.05.

Explanation / Answer

1.
Explanatory variable is steps per day

2.
Response variable is BMI

3.
From the scatterplot, we see that as, the steps per day increases, BMI decreases. So, there is negative average linear relation between steps per day and BMI.

4.
a. value of correlation = -0.385
b. Degree of freedom df = n-2 = 100 - 2 = 98
critical value of the correlation to be significant for significance level of 0.05 and df = 98 is 0.197

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