Question 3

Paste dataset 3 into an appropriate dataset summarizer

1. Paste in computer output that measure evidence for the claim there is a relationship between the variables "which version?" and "correct or incorrect?" if you consider the whole population

Hint: inferential statistics measure evidence for a claim.

	Two way table
	correct count	incorrect count	row total
Version A	399	68	467
Version B	461	72	533
Inferential statistics
n1	n2		phat 1	phat 2
467	533		0.854389722	0.86491557
Estimate of the difference between population proportions
phat1-phat2
-0.01052585
standard error of estimate
0.02199334
Confidence interval
you are 95% confident that p1-p2 is between
-0.0536328
and
0.0325811
0 is in the confidence interval so there is not strong evidence of a difference in proportions
hypothesis testing
test stat		two sided pvalue
-0.47859263		0.632228465
To calculate the p-value H0:p1=p2 is assumed to be true
since the test is two sided H1 is H1:p1?p2

1. Calculate the z test stat for sample proportion , the formula is =