The equation of the least squares regression line is modifyingabove y with caret equals 2.0233 x minus 2.3256 and the sum of squared residuals for this line is 0.7907. answer parts (). x 3 4 5 7 8 y 4 6 7 12 14 (a) predict the mean value of y if xequals12. modifyingabove y with caret equals 22 (round to one decimal place as needed.) (b) construct a 95% confidence interval about the mean value of y if xequals12.

Atechnician compares repair costs for two types of microwave ovens (type i and type ii). he believes that the repair cost for type i ovens is greater than the repair cost for type ii ovens. a sample of 6767 type i ovens has a mean repair cost of $79.79$⁢79.79. the population standard deviation for the repair of type i ovens is known to be $19.18$⁢19.18. a sample of 5555 type ii ovens has a mean repair cost of $75.24$⁢75.24. the population standard deviation for the repair of type ii ovens is known to be $21.40$⁢21.40. conduct a hypothesis test of the technician's claim at the 0.050.05 level of significance. let μ1μ1 be the true mean repair cost for type i ovens and μ2μ2 be the true mean repair cost for type ii ovens. step 2 of 4 : compute the value of the test statistic. round your answer to two decimal places.