Consider the ff. data set , in which a maker of asphalt shingles is interested in the relationship between sales for a particular year and factors that influence sales. Y- sales(in thou $); X1- promotional accounts; X2- active accounts; X3- competing brands; X4- potential

Table 3.5

LET 1 2 3 4 5

Y X1 X2 X3 X4

79.3 5.5 31 10 8

200.1 2.5 55 8 6

163.2 8 67 12 9

200.1 3 50 7 16

146 3 38 8 15

177.7 2.9 71 12 17

30.9 8 30 12 8

The pearson correlation coefficient ofsales and potential?

Interpret the relationship betweenpromotional and active accounts?

A positive moderate relationship is nottrue in active accounts and competing brands. True or false

The correlation of sales and promotional accounts, keeping competing brands constant?

Ofthe 4 independent variables , only the active accounts is highly related to sales. True or false