Use the one-standard-deviation

chi squared dash test2-test

and the one-standard-deviation

chi squared dash interval2-interval

procedure to conduct the required hypothesis test and obtain the specified confidence interval for a sample of size

nequals=1212

with a standard deviation of

sequals=44.

a.

Upper H 0H0:

sigmaequals=55,

Upper H Subscript aHa:

sigmaless than<55,

alphaequals=0.050.05

b.

9090%

confidence interval

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chi squared2

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Question content area bottom

Part 1

a. Compute the test statistic.

7.047.04

(Round to three decimal places as needed.)

Part 2

Find the critical value(s).

4.5754.575

(Round to three decimal places as needed. Use a comma to separate answers as needed.)

Part 3

Make a conclusion based on these results. Choose the correct answer below.

A.

Do not rejectDonotreject

Upper H 0H0.

The test statistic is

less than or equal tolessthanorequalto

the critical value.

B.

RejectReject

Upper H 0H0.

The test statistic is

greater thangreaterthan

the critical value.

C.

RejectReject

Upper H 0H0.

The test statistic is

less than or equal tolessthanorequalto

the critical value.

D.

Do not rejectDonotreject

Upper H 0H0.

The test statistic is

greater thangreaterthan

the critical value.

Your answer is correct.

Part 4

b. The

9090%

confidence interval is from

enter your response here

to

enter your response here.