AP Q&A Statistics by Martin Sternstein

Author:Martin Sternstein
Language: eng
Format: epub
Publisher: Barrons Educational Series
Published: 2020-05-20T00:00:00+00:00

HYPOTHESIS TESTS FOR SLOPES

495. A retailer believes that sales of some luxury items go up when the price is higher. Below is the computer printout for the regression analysis of sales versus price (in $1,000s) for a random sample of these luxury items.

What is the P-value for a t-test with H0: β = 0 and Ha: β > 0?

(A) 0.0124

(B) 0.0239

(C) 0.0478

(D) 0.0956

(E) 0.5060

496. A linear regression analysis is performed on two variables. Which of the following tells you that another model probably gives a better fit?

(A) The correlation r is low.

(B) The mean of the residuals is 0.

(C) The P-value for H0: β = 0 and Ha: β > 0 is low.

(D) The coefficient of determination is high.

(E) The residual plot has a pattern.

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