Exercise 932 METHODS AND APPLICATIONS Bayus 1991 studied the

Exercise 9.32 METHODS AND APPLICATIONS

Bayus (1991) studied the mean numbers of auto dealers visited by early and late replacement buyers. Letting be the mean number of dealers visited by all late replacement buyers, set up the null and alternative hypotheses needed if we wish to attempt to provide evidence that differs from 4 dealers. A random sample of 100 late replacement buyers yields a mean and a standard deviation of the number of dealers visited of $\"formula280.mml\"$ = 4.26 and s = .52. Using a critical value and assuming approximate normality to test the hypotheses you set up by setting equal to .10, .05, .01, and .001. Do we estimate that is less than 4 or greater than 4? (Round your answers to 3 decimal places.)

H₀ : = 4 versus H_a : 4

t = ( X - X-bar) / (Sample SD / sqrt(n))

= (4.26 -4 ) / (0.52/sqrt(100))

= 5 Answer

>> dF = 100-1 = 99

t_{/2 =}_0.0005= 3.174

Critical value is less than t value

Therefore , Greater than 4 Answer

t_{/2 = 0.05=} 1.66
t_{/2 =}_0.025= 1.984
t_{/2 =}_0.005= 2.626
t_{/2 =}_0.0005= 3.174 Critical value is less than t value Therefore , Greater than 4 Answer

Exercise 9.32 METHODS AND APPLICATIONS Bayus (1991) studied the mean numbers of auto dealers visited by early and late replacement buyers. Letting be the mean n

Exercise 932 METHODS AND APPLICATIONS Bayus 1991 studied the

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