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15.Name that test statistic: The heart rate for second born identical twins are different than the...

15.Name that test statistic: The heart rate for second born identical twins are different than the heart rate for first born identical twins. The sample consists of 90 pairs of twins.

A. T

B. F

C. R

D. R-squared

18.If you are given a correlation coefficient, how do you calculate the amount of variance accounted for in Y by X?

A. You compute a regression.

B. You look at the regression coefficient.

C. You square R.

D. You look at the y-intercept.

Math   Statistics-And-Probability   
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15. The heart rate for second born identical twins are different than the heart rate for first born identical twins. The sample consists of 90 pairs of twins. Since, there are two independent population means to be compared, T-statistic will be used to come at a judgement. (A)

18. The amount of variance accounted for in Y by X, is calculated using the coefficient of determination or R2. In simple linear regression, R2 is often called the coefficient of determination, because it is equal to the proportion of variability in Y (the outcome variable) that is explained by (or determined by) the linear relationship between X and Y. (C)

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