Question 1011985
Can someone please help?

Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of​ people, the linear correlation coefficient is 0.793 and the equation of the regression line is ModifyingAbove y with caret equals 24.46 plus 0.75 xy=24.46+0.75x​, where x represents the IQ score of the twin born first twin born first. ​Also, the 20 x values have a mean of 106.43 and the 20 y values have a mean of 103.9. What is the best predicted IQ of the twin born second twin born second​, given that the twin born first twin born first has an IQ of 106? Use a significance level of 0.05.

The best predicted IQ of the twin born second twin born second is ___?
​(Round to two decimal places as​ needed.)
<pre>I'll get you started on this.
1) Calculate the critical t-value (groups consist of < 30 members) 
2) If the absolute value of the linear correlation coefficient (r) is > the critical t-value, a <b>LINEAR CORRELATION EXISTS</b> between
   the 2 groups (younger and older twins) of IQs. Thus, the regression equation: &#375;, or {{{y-hat = 24.46 + 0.75x}}} can be used to predict
   the IQ of the younger twins (twins born second), by substituting the x-value 106 into the equation.
3) However, if  the absolute value of the linear correlation coefficient (r) is &#8804; the critical t-value, a <b>LINEAR CORRELATION DOES NOT</b>
   exist between the 2 groups (younger and older twins) of IQs. Thus, the best predictor of y-hat or the younger twins' IQ is <span style="text-decoration: overline">y</span>: 
   the mean of the group: twin born second, or the younger twins (103.9)