Find the correlation between Sales Volume and Advertising Expenditure and interpretation of the results

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

Q1: In  sheet SalesPlot.xlsx,

a) calculate all descriptive statistics for the data Sales Volume.

b) Find the correlation between Sales Volume and Advertising Expenditure and interpretation of the results

c) Find scatter plot between Sales Volume and Advertising Expenditure and interpretation of the results

d) Calculate the the simple linear regression of Sales Volume on Advertising Expenditure and interpretation of the results.

Q2)

 a) Finding P(x < 31.2) When µ =  33 and   

 b)  A bank randomly selects a sample of 15 of its commercial loan accounts, with mean 1.3433, and standard deviation equal 0.1921, calculate a 95 percent confidence interval for commercial loan accounts.

c) Compute 98 percent confidence intervals for the population proportion p( )

pˆ  = 0.4  and n =100 q3) 

a) the sheet (CreditCd) include the average interest rate charged by U.S, test the following Hypothesis.

b) Test for a population proportion The Following Hypothesis. 

Q4)

a)Assume we have selected two independent random samples from population having proportion p1 and p2, and  , use  

b) using the data in sheet (Catalyst)  

c) The company selects 22 sales trainees who are randomly divided into two experimental groups—one receives type Aand the other type Btraining. The salespeople are then assigned and managed without regard to the training they have received. At the year’s end, the manager reviews the performances of salespeople in these groups and finds the following result.

 Set up the null and alternative hypotheses needed to attempt to establish that type Atraining results in higher mean weekly sales than does type Btraining (ASSUME VARIANCES AR EQUAL).

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