[Solution Library] For the data in Q4, calculate the value of the fitted line at x* = 40,42 and 50. Given that the mean of Y at X = x* is estimated by ax* +
Question: For the data in Q4, calculate the value of the fitted line at x* = 40,42 and 50. Given that the mean of Y at X = x* is estimated by ax* + b, which is a Normal random variable with mean Ax* + B and standard deviation
\[\sigma \sqrt{\frac{1}{n}+\frac{{{\left( x*-\bar{x} \right)}^{2}}}{{{C}_{XX}}}}\]obtain 95% confidence intervals for the mean of Y for x* = 40,42 and 50.
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