The National Weather Service says that the mean daily high temperature for October in a large mid-western city is 56F. A local weather service suspects that this value is not accurate and wants to perform a hypothesis test to determine whether the mean is actually lower than 56F. A sample of mean daily high temperatures for October over the past 37 years yields a sample mean of 54oF. Assume that the population standard deviation is 5.6 F. Perform the hypothesis test at the 1% significance level.

WEEK 12 HOMEWORK (ONE ATTEMPT AND DUE MARCH 28TH AT 11:59 PM)

Started: Mar 27 at 7:58pm

Quiz Instructions

THIS IS THE GRADED HOMEWORK FOR WEEK 12. YOU HAVE ONE ATTEMPT. IT IS DUE ON SUNDAY MARCH 28TH AT 11:59 PM.

Flag question: Question 1

Question 1

1pts

In the past, the mean running time for a certain type of flashlight battery has been 8.1 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has changed as a result. This test would be a

(a) left-tailed test

(b) two-tailed test

(c) right-tailed test

The test is(Enter a, b, or c)

Flag question: Question 2

Question 2

1pts

The recommended dietary allowance (RDA) of vitamin C for women is 75 milligrams per day. A hypothesis test is to be performed to decide whether adult women are, on average, getting less than the RDA of 75 milligrams per day. This test would be

(a) left-tailed

(b) two-tailed

(c) right-tailed

The test is(Enter a, b, or c)

Flag question: Question 3

Question 3

1pts

The maximum acceptable level of a certain toxic chemical in vegetables has been set at 0.6 parts per million (ppm).A consumer health group measured the level of the chemical in a random sample of tomatoes obtained from one producer to determine whether the mean level of the chemical in these tomatoes exceeds the recommended limit. This test would be

(a) left-tailed

(b) two-tailed

(c) right-tailed

The test is(Enter a, b, or c)

Flag question: Question 4

Question 4

8pts

The National Weather Service says that the mean daily high temperature for October in a large mid-western city is 56F. A local weather service suspects that this value is not accurate and wants to perform a hypothesis test to determine whether the mean is actually lower than 56F. A sample of mean daily high temperatures for October over the past 37 years yields a sample mean of 54oF. Assume that the population standard deviation is 5.6 F. Perform the hypothesis test at the 1% significance level.

STEP 1.H0: oH1: oNOTE: For

enter /=

STEP 2.This test is (e) left-tailed, (f) two-tailed or (g) right-tailed test.

This test is(enter e, f or g)

STEP 3.The critical value (s) is

Use the following chart to identify the critical value (s)

Left-tailedTwo-tailedRight tailed

=10%z = -1.28 (A)z=1.65

z=1.65(B)z =1.28 (C)

=5%z = -1.65 (D)z=1.96

z=1.96(E)z = -1.65 (F)

=1%z = -2.33 (G)z=2.58

z=2.58(H)z = -2.33 (I)

The critical value (s) is/are(Enter a letter A through I)

STEP 4.The test statistics is(Enter a z-score rounded to two decimal places)

The test statistics is z = [g]

STEP 5.Make the decision.

A: Reject the null hypothesis

B: Do not reject the null hypothesis.

The decision is(Enter A or B)