To test

H0:

=60

versus

H1:

<60,

a random sample of size

n=26

is obtained from a population that is known to be normally distributed. Complete parts (a) through (d) below.

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Part 1

(a) If

x=57.9

and

s=14.8,

compute the test statistic.

t0=negative . 724.724

(Round to three decimal places as needed.)

Part 2

(b) If the researcher decides to test this hypothesis at the

=0.1

level of significance, determine the critical value(s). Although technology or a t-distribution table can be used to find the critical value, in this problem use the t-distribution table given.

Critical Value:

enter your response here

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