# Statistics 101

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If a regression equation is:Â Â GPA = 0.5(hours per week studying) – 0.75(hours per week partying) + 1.Â  Which variable is inversely related to GPA?

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 a. Neither are inversely related. b. BothÂ are inversely related. c. Hrs studying is inversely related. d. Hrs partying is inversely related.

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Whenever you want to know how much variability one variable accounts for in another, you need to find the:

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 a. r b. r squared c. slope d. SEE (standard error of estimate)

Which of the following correlations is the strongest?

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 a. 0.95 b. 0.56 c. -0.96 d. -0.95

A regression is performed to quantify the relationship between x and y.Â  What information does this analysis give you?

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 a. The r b. The line of best fit c. The standard error of estimate d. All of the above

AÂ regression analysis was performed between two variables, x and y.Â  The equation for this line of best fit for the relationship between the x and theÂ y was:Â  y = 54x +2.Â  If someone had a x = 1, what was the y?

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 a. 56 b. 54 c. 2 d. Can’t be determined.

Which of the following correlation coefficients shows an inverse relationship?

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 a. 0.9 b. -0.77 c. 0.77 d. 0.04

A regression equation will have the format y = mx + b.Â  What is the m?

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 a. The variable on the x axis. b. The variable on the y axis. c. The y intercept. d. The slope of the line.   Â

A correlation coefficient is a number that looks like what?

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a. AÂ number between 0 and 1.0 that can be positive or negative
b. A positive number between 1 and 100
c. A negative number between -1 and -100
d. None of the above

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Measures of association include w

hich of the following?

 a. Correlations b. Regression c. Multiple regression d. All of the above e. None of the above

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The advantage of an r squared over an r is: a. An r squared shows the direction of the relationship b. An r squared can be compared to 1.0 c. An r squared can be compared directly to another r squared d. There is no advantage of an r squared over an r