A sample mean, sample size, and population standard deviation are provided below. Use the one-mean z-test to perform the required hypothesis test at the

11%

significance level.

x overbarxequals=3030,

nnequals=4040,

sigmaequals=44,

Upper H 0H0:

mu equals 32=32,

Upper H Subscript aHa:

mu less than 32<32

Question content area bottom

Part 1

The test statistic is

zequals=negative 3.163.16.

(Round to two decimal places as needed.)

Part 2

Identify the critical value(s). Select the correct choice below and fill in the answer box within your choice.

(Round to

twotwo

decimal places as needed.)

A.

The critical

values arevaluesare

plus or minus z Subscript alpha divided by 2 Baseline equals plus or minusz/2=enter your response here.

B.

The critical

value isvalueis

z Subscript alpha Baseline equalsz=enter your response here.

C.

The critical

value isvalueis

negative z Subscript alpha Baseline equalsz=enter your response here.