29. The lifetime of a certain brand of heat pump is known to be normally distributed....
29.
The lifetime of a certain brand of heat pump is known to be normally distributed. A sample of 6 heat pumps yielded the following observations:
2.0 1.3 6.0 1.9 5.1 4
At a significance level of α= .10 we will see if there is reason to
believe that the mean life
of the heat pumps is different from 2.
What are the critical values for this test?
| A. |
±2.571 |
|
| B. |
±1.943 |
|
| C. |
±1.645 |
|
| D. |
±2.015 |
|
| E. |
±1.615 |
30.
The lifetime of a certain brand of heat pump is known to be normally distributed. A sample of 6 heat pumps yielded the following observations:
2.0 1.3 6.0 1.9 5.1 4
At a significance level of α= .10 we will see if there is reason to
believe that the mean life
of the heat pumps is different from 2.
Approximate the p-value for this test.
| A. |
.05<P<.10 |
|
| B. |
.025<P<.05 |
|
| C. |
.10<P<.20 |
|
| D. |
.0802 |
|
| E. |
The correct answer is not among the choices. |
31.
The lifetime of a certain brand of heat pump is known to be normally distributed. A sample of 6 heat pumps yielded the following observations:
2.0 1.3 6.0 1.9 5.1 4
At a significance level of α= .10 we will see if there is reason to
believe that the mean life
of the heat pumps is different from 2.
What is the final conclusion at alpha=.10?
| A. |
Reject μ=2 at this alpha level |
|
| B. |
Do not reject Ho: μ=2 |
|
| C. |
conclude that μ>2 |
|
| D. |
conclude that μ<2 |
|
| E. |
The correct answer is not among the choices. |
Homework Answers
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29.
The lifetime of a certain brand of heat pump is known to be
normally distributed....
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A random sample of heat pumps of a certain type yielded the following observations on lifetime (in years): 2.0, 1.3, 6.0, 1.9, 5.1, .4, 1.0, 5.3, 15.7, .7, 4.8, .9, 12.2, 5.3, .6 a. Assume that the lifetime distribution is exponential and use an argument parallel to that of Example 7.5 to obtain a 95% CI for expected (true average) lifetime. b. How should the interval of part (a) be altered to achieve a confidence level of 99%? c. What...
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