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Predicted Value of Standardized Test Statistics

1. Given the equation of a regression line is y=-2.5x-7.6, what is the best predicted value for y given x=4.1? Assume that the variables x and y have a significant correlation.
A. -2.65 B. 17.85 C. -17.85 D. 2.65

2. You wish to test the claim that the mean>23 at a level of significance of alpha=0.05 and are given sample statistics n=50, x=23.3000002, and s=1.2. Compute the value of the standardized test statistic. Round to 2 decimal places.
A. 3.11 B. 0.98 C. 2.31 D. 1.77

Solution Preview

1.Calculate the correlation coefficient, r, for the data below.

x -9 -7 0 -3 -5 -6 -4 -2 -1 -8
y -2 0 17 9 6 2 7 11 14 08

A. 0.990 B 0.819 C. 0.792 D. 0.881

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The ...

Solution Summary

The solution works through the given equations of determine the best predicted value for y and finds the value of the standardized test statistic with the provided sample statistics.

$2.19