According to the computer output in Table 8:
(a) Predict the mean response when x = 5000.
(b) Find a 90% confidence interval for the mean response when x = 5000. You will need the additional information n = 30, = 8354, and ˆ‘ (x1 - )2 = 97,599,296.
Table 8

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THE REGRESSION EgUATIOX IS 994 0.104x PREDICTOR CONSTANT COEE 994.0 0.10373 STDEV 254-7 0.02978 T-RATIo 3.90 3.48 0.001 0.002 S 299.4 R-SQ 30.2% ANALYSIS OF VARIANCE SOURCE REGREGSION ERROR TOTAL DF S5 MS 1 1087765 1087765 1214 0.002 89636 28 29 2509820 3597585