suppose IQ scores were obtained from randomly selected twins. For 20 such pairs
ID: 3230316 • Letter: S
Question
suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is 0.880 and the equation of the regression line is y 4.53 +0.84x, where x represents the lo score of the twin born first. Also, the 20 x values have a mean of 94.84 and the 20 y values have a mean of 94.45. What is the best predicted IQ of the twin born second, given that the twin born first has an IQ of 101? Use a significance level of 0.05. E click the icon to view the critical values of the Pearson correlation coefficient r. The best predicted IQ of the twin bom second is (Round to two decimal places as needed.)Explanation / Answer
Looking at the table, critical value with 19 degrees of freedom at 0.05 is 0.456.
2)
y=14.53+0.84x
=14.53+0.84(101)
=14.53+84.84
=99.37=> Ans
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