Does exercise produce weight loss? Five employees at the Krispy Kreme in Orem tr
ID: 3222706 • Letter: D
Question
Does exercise produce weight loss? Five employees at the Krispy Kreme in Orem try to find out. They count how many hours they each work out over a six month period, then weigh themselves:
Workout hours per week (x)
Weight (y)
0
240
10
210
10
220
15
185
20
161
The goal is to calculate the correlation coefficient for these data. First, what’s the mean of x?
more than 13.5
The goal is to calculate the correlation coefficient for these data. What’s the mean of y?
more than 220.0
more than 10,600
more than 800
more than 20,600
What is the correlation coefficient for these data?
more than -0.70
Calculate t for the correlation coefficient. Take the absolute value. What is it?
more than 5.5
How many degrees of freedom should be used to calculate the p-value for the hypothesis that r=0?
5
Given the t-score and degree of freedom you just calculated, what is p-value given a two-tail test?
more than 0.0055
If the two-tailed t-test p-value for the significance test on the correlation coefficient r is 0.008, which of the following statement is true?
The correlation between workout hours and weight is statistically significantly no different from zero at 5% significance level.
Workout hours per week (x)
Weight (y)
0
240
10
210
10
220
15
185
20
161
Explanation / Answer
mean of x--between 10.5 and 11.5
mean of y--between 200.1 and 220.0
symbol not clear
symbol not clear
symbol not clear
The correlation between workout hours and weight is statistically significantly different from zero at 5% significance level.
symbol not clear
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.