Elementary Statistics kayla Pierre 7/25/17 421PM Quiz: Chapter 10 Review Quiz Su

Question

Elementary Statistics kayla Pierre 7/25/17 421PM Quiz: Chapter 10 Review Quiz Submit Qulz This Question: 1 pt 40f 10 (0 complete) This Quiz: 10 pts possible Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is 0.797 and the equation of the regression line is y 9.03+0.9x, where x represents the IQ score of the twin born first. Also, the 20 x values have a mean of 99 51 and the 20 y values have a mean of 98.55. What is the best predicted IQ of the twin born second, given that the twin born first has an IQ of 108? Use a significance level of 0.05 | Click the icon to view the critcal values of the Pearson correlation coefficient r The best predicted IQ of the twin born second is (Round to two decimal places as needed)

Explanation / Answer

The equation of the regression line is

y^ = 9.03 + 0.9 x

x = the twin born first has an IQ of 108

y^ = 9.03 + 0.9 * 108

y^ = 9.03 + 97.2

y^ = 106.23

The best predicted IQ of the twin born second is 106.23

  

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