a)How much is the estimated average quarterly increase in Sales? B.) Give a 95%

Question

a)How much is the estimated average quarterly increase in Sales?

B.) Give a 95% confidence interval for the average quarterly increase in Sales

Time Series Plot of SALES 320 300 280 260 240 220 200 Quarter Q1 Q1 Q1 Q1 Q1 Q1 Q1 Q1 Q1 Q1 Year 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 The regression equation is SALES 199+2.56 TIME Predictor Constant 199.017 5.128 38.81 0.000 TIME .5559 0.2180--- Analysis of Variance DE Source Regression Residual Error 38 9622 Total 1 34818 34818 137.50 0.000 39 44440

Explanation / Answer

a)  estimated average quarterly increase in Sales = 2.5559

b) Margin of error = 2.0244*0.2180 = 0.4413

95% Interval

(2.5559-0.4413, 2.5559+0.4413)

= (2.115, 2.997)

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