Studying with practice exams and having difficulty to understand. Part roe: Mult

Question

Studying with practice exams and having difficulty to understand. Part roe: Multriple choice questions Use following for Questions #6-#10 Select one from A to E as appropriate Student Study Times A survey asked the following question: "About how much time (in minutes) do you on a typical weeknight?" of randomly selected 46 first-year ASU students. The be the mean study time of all first-year ASU sample mean was 118 minutes. Let students, assume 63 mites164 that population standard deviation Question#6 (7 points) Compute a margin oferror in a 90% confidence for the final answer interval for Give 2 decimal places A)19.17 B)18.78 C15.77 D)19.30 E) none of these Question 7 7 points) tobenomoreshanis g yconfidence intervalfor E2 5,99 :8-045. t-a size is asyconfidenceintervalfor_p 4 needed for a margin of error What to be no more than 5 minutes A) 260 B) n2458 C) n2 676 D) n2 277 E) none of these Question#8 (7 points) Suppose you watto testif isless than 2 hours (120minutes). Formulate null and altenative hypotheses to be tested 120 -How=120 B) Ho: =118 H,:

Explanation / Answer

Here we have been asked Question 10:

Question 10:

For a 5% level of significance and as we know the alternate hypothesis is of not equal to type, therefore this is a case of a two tailed hypothesis test. For 5% level of significance, we get from the standard normal tables:

P( z < 1.96 ) = 0.975 which due to symmetry means that: ( 0.025 on either side )

P( -1.96 < Z < 1.96 ) = 0.95 = 1 - 0.05

Therefore D is the set of critical values required here for the 5% level of significance.

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