Question

z=3.51 is incorrect. I chose this answer originally and it is wrong

All above are true is the incorrect answer. I chose this answer on the test and it was incorrect,

Answer 1

Here we have x1-45.67, si-10.9, ,A-86 39.87, 2-12.47, n2-113 Hypotheses are: AP Test is two tailed. Level of significance: α-0.05 Since we can assume that variances are equal so degree of freedom of t test will be df=n1 + n2-2-197 The pooled standard deviation is: (n, -)s1+(0,-5 -118182 n1 +2-2 Test Statistics: t = ((45.67-39.87) )/(11.8 182 * sqrt(( 1 /86)+(1 /113))) +_-3.43

That is correct option is t = 3.43

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Second question:

First option is correct.