chapter 3 - Chapter3Assignment3.22

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Chapter 3 Assignment  3.22 a) Calculate x- (line is suppose to be over the x), s2, an s for the expense data. In addition show tht the two different formula's for calculating s2 give the same result. Entertaining Expenses (x) 157 132 109 145 125 139 sum(x)=807 x- (line should be over the x) =  sum(x)/N N= 6 x- (line should be over the x) = 134.5 s2=(x1-x-)^2+(x2-x-_^2…. .(xn-x-)^2/N1 s2=(157-134.5)^2+(132-134.5)^2….(139-134.5)^2/s s2= 276.7 s=check mark 276.7 s= 16.63 Another method for calculating s2 sum(xi)^2=(157)^2+(132)^2+(109)^2+(145)^2+(125)^2+(139)^2=109925 (sumxi)^2=(157+132+109+145+125+139)^2=651249 s2=1/5{109925-1/6(651249)]=276.7 b) Assuming that the distribution of entertainment expenses is approximately normally distributed, calculated estimates of tolerance intervals containing 68.26%, 95.44%, and
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This note was uploaded on 07/30/2011 for the course BUS 308 taught by Professor Williams during the Spring '11 term at Ashford University.

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chapter 3 - Chapter3Assignment3.22

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