Stats 1 Test Review PDF

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Review material for statistical methods...

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STA 3123

Statistics for Behavior Sciences

Review Test #3

1. Using the data above and the partial computer output, answer the following questions.

X 120 136 150 155

Y 85 63 34 39

162

58

169 178 184 190

35 57 12 15

Regression Analysis Regression Statistics Multiple R R Square Adjusted R Square 15.43487 Standard Error 5 Observations ANOVA df Regression Residual Total

Intercept X

a) b) c) d) e)

SS 1 7 8

4477.5

Coeff. 175.703 -0.819

St Error 38.62 0.238

MS

F 11.79

238.23

t Stat 4.548

Pvalue 0.002 0.0109

Find the correlation coefficient and explain it. Find the equation of the line that represents the relationship between the two variables. Explain the effect of the X in Y using the regression coefficient. Test whether X is a significant variable to explain Y, at %5 level of significance. Construct a 99% predictor confidence interval for the average value of Y if X is 160

Prof. Muniz

STA 3123

Statistics for Behavior Sciences

2. The table shows the data corresponding to the scores on the aptitude test and statistics grades, for a sample of 5 students. Scores on the aptitude test 95 85 80 70 60

Statistic scores 85 95 70 65 70

Find the coefficient of determination if you want to explain statistics grades using the scores on the aptitude test.

Prof. Muniz...