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This quiz contains 17 practice questions covering Whoville Statistics: Regression, Probability, and Distributions.

Whoville Statistics: Regression, Probability, and Distributions Practice Quiz

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Test your knowledge of Whoville Statistics: Regression, Probability, and Distributions with 17 practice questions. Get instant feedback and detailed explanations to identify gaps and improve your understanding.

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Question 1 of 170 answered

Given

\bar{G}=23.1

s_G=6.54

\bar{IQ}=135.7

s_{IQ}=9.23

, and

r=0.65

, what is the slope

b_1

of the least-squares regression predicting WhoIQ from green marbles (rounded)?

Incorrect

Correct answer:

b_1 \approx 0.92

Compute $b_1 = r \frac{s_{IQ}}{s_G} = 0.65 \times \frac{9.23}{6.54} \approx 0.65 \times 1.412 \approx 0.918$, which rounds to about 0.92.

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