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13) Find the critical value for a left-tailed test with (X: 0 01.
A) -2.055 B) -2.575 C)-1.96 D) -2.33
14) Find the critical value for a two—tailed test with as 0.08.
A) 22.65 B) 21.75 C) 11.405 D) 21.96
15) Suppose you want to test the daim that u
or = 0.0!. when should you reject H0?
A) Reject No if the standardized test statistic is less than -1.645.
B) Reject Ho it the standardized test is less than -1.28.
C) Reject Ho if the standardized test statistic is less than -2.575.
D) Reyect [to it the standardized test statistic is less than -2.33.
16) You wish to test the claim that in a: 32 at a level of significance of a a 0.05 and are given sample statistics n =
35, x = 31.1, and s = 2.7. Compute the value of the standardized test statistic. Round your answer to two
decimal places.
A) -1.97 B) -1.83 C) -2.86 D) -3.12
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
1.7) A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 34,000 miles. To check
the claim. the firm randomly selects and tests 54 of these tires and gets a mean lifetime of 33,620 miles with
a standard deviation of 12(l) miles. At (1 = 0.05. test the trucking firrn’s claim.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
18) Find the critical values for a sample with n = 10 and ct = 0.05 if H0: in 2 20.
A) -1.383 B) ~2.262 C) -3. 250 D) -1.833
19) Find the standardized test statistic t for a sample with n = 15, := 7.5, s = 0.8, and on = 0.05 if H0: in as 7.2.
Round your answer to three decimal places.
A) 1.312 8) L452 C) 1.631 D) 1.728