HA2-1 Read only- Word O S insert Draw Design Layout References Mailings Review V

Question

HA2-1 Read only- Word O S insert Draw Design Layout References Mailings Review View Aab 1No spac.. Heading 2 1 Normal copy Format Painter clipboard data for annual sales in milions dolansm and Question 2 expenditure and sales revenue for 30 stores in the retailindustry. He collects researcher wants to study the relationship between advertising following: advertising expenditure in thousands of dollars and the a. calculate a Estimated regression equation R b. Find the coefficient of determination (R and interpret this value. use a 10v would expect sales revenue to increase when a expenses increase. Using the rejection region method. conductarelevant hypothesis test to answer this queition significance level state the hypothesis Ho: Test statistic

Explanation / Answer

a)a=Sxy/Sxx =8520/1704 =5

b=ybar-a*xbar =130-14*5 =60

regression equation y(x)=5x+60

b) R2 =Sxy2/(Sxx*Sxy) =(8520)2/(47190*1704)=0.9027

c) Ho: r=0

Ha : r>0

here r =(0.9027)1/2 =0.9501

test stat =R*((n-2)/(1-R2))1/2 =16.12

critical value =1.3125

reject Ho in favour of H1

conclusion : there is +ve regression b/w sales and advertising expense,

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