Question 390557: Assume that in a hypothesis test with null hypothesis 0 μ H : = 13.0 at a = 0.05, that a
value of 11.0 for the sample mean results in the null hypothesis not being rejected. That
corresponds to a confidence interval result of
A) The 95% confidence interval for the mean does not contain the value 13.0
B) The 95% confidence interval for the mean contains the value 11.0
C) There is insufficient information to conclude whether the 95% confidence interval
for the mean contains or does not contain the value 13.0
D) The 95% confidence interval for the mean contains the value 13.0
Nationwide, the average waiting time until electric utility customer service
representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy
Company took a sample of 35 calls and found that, on the average, they answered in 240
seconds per call with a standard deviation of 50. Can the company claim that they are
faster than the average utility?
A) No, because –0.20 falls in the critical region
B) Yes, because –7.10 falls in the critical region
C) No, because –1.20 falls in the critical region
D) Yes, because –0.20 falls in the critical region
If the observed value is 4, the expected value is 5, and the standard error is 4, then the
test value used for the z test is equal to
A) –1.00 B) 0.25 C) –0.25 D) 1.00
What is the critical t-value for a right-tailed test when a = .025and d.f. = 12?
A) 0.695 B) 2.179 C) 2.831 D) 2.201
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Assume that in a hypothesis test with null hypothesis Ho: u = 13.0 at a = 0.05, that a value of 11.0 for the sample mean results in the null hypothesis not being rejected. That corresponds to a confidence interval result of
A) The 95% confidence interval for the mean does not contain the value 13.0
B) The 95% confidence interval for the mean contains the value 11.0
C) There is insufficient information to conclude whether the 95% confidence interval for the mean contains or does not contain the value 13.0
D) The 95% confidence interval for the mean contains the value 13.0
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Answer: A
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Nationwide, the average waiting time until electric utility customer service
representative answers a call is 300 seconds per call.
The Gigantic Kilowatt Energy Company took a sample of 35 calls and found that, on the average, they answered in 240 seconds per call with a standard deviation of 50. Can the company claim that they are faster than the average utility?
Ho: u = 300
Ha: u < 300 (claim)
t(240) = (240-300)/[50/sqrt(35)] = -7.10
A) No, because –0.20 falls in the critical region
B) Yes, because –7.10 falls in the critical region
C) No, because –1.20 falls in the critical region
D) Yes, because –0.20 falls in the critical region
Answer: B
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If the observed value is 4, the expected value is 5, and the standard error is 4, then the test value used for the z test is equal to:
z(4) = (4-5)/4 = -1/4
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A) –1.00 B) 0.25 C) –0.25 D) 1.00
Ans: C
==========================================
What is the critical t-value for a right-tailed test when a = .025and d.f. = 12?
A) 0.695 B) 2.179 C) 2.831 D) 2.201
Ans: B
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Cheers,
Stan H.
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