ONLY QUESTION #2 ALL PARTS What two things can you determine about a relationshi

Question

ONLY QUESTION #2 ALL PARTS

What two things can you determine about a relationship using the r value? Using the data above, what is the expected nervousness score for someone who drank 5 cups of coffee? What is the critical r value for a two-tailed test when df = 15 and alpha = 0.01? An educational psychologist is interested in determining whether attitudes toward school change with age. She selects 30 seventh-graders, 30 ninth-graders, and 30 eleventh-graders and administers a "Do you like school?" test.

Explanation / Answer

Solution:-

a) The two things that we can determine about a relationship using the r value are:-

In statistics, the correlation coefficient r measures the strength and direction of a linear relationship between two variables.

In this example two variables are strongly positively linearly related to each other.

b) The expected nervousness score is Y = 4.8073.

Y = 0.9004*X + 0.3053

X = 5

Y = 0.9004 × 5 + 0.3053

Y = 4.502 + 0.3053

Y = 4.8073

c) The critical value for a two tailed test when df = 15 and alpha = 0.01 is + 2.947.

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