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QUESTION 1 Which of the following is the best definition of a confidence interval for ? a. A confidence interval for is an interval where
QUESTION 1
- Which of the following is the best definition of a confidence interval for ?
a. A confidence interval for is an interval where is guaranteed to be between the lower and upper limits.
b.A confidence interval for is an interval of the form L < < U, where the endpoints L and U are computed from the sample data.
c.A confidence interval for can only be one-sided.
d.A confidence interval for can only be two-sided.
QUESTION 2
- You can calculate a confidence interval for , if you have:
a. | The confidence level that you are using (in order to calculate the z value), the sample mean, sample size, and population standard deviation |
b. | The confidence level and the sample mean |
c. | The confidence level, the population mean, and the sample size |
d. | The confidence level, the population mean, the sample size, and the population standard deviation. |
QUESTION 3
- Historical data has indicated that the time it takes to complete one re-conditioning on a certain part is normally distributed and that= 2 min. A random sample of 9 specimens was tested, and the average time was found to be 98 min. Find a 95% confidence interval on the time for re-conditioning. Please enter only the lower limit answer in the box. Round your answer to three significant digits.
QUESTION 4
- The life in hours of a 75-watt light bulb is known to be normally distributed with =25 hours. A random sample of 20 bulbs has a mean life of 1014 hours. Construct a 99% two-sided confidence interval on the mean life. What are the lower and upper limits of this interval?
a. | 999.60 & 1048.40 |
b. | 999.60 & 1028.40 |
c. | 969.60 & 1028.40 |
d. | 1003.04 & 1024.96 |
QUESTION 5
- Using the data in question 4, construct a 95% lower bound on the mean life.
a. | 996.4 |
b. | 999.8 |
c. | 1001.8 |
d. | 1004.80 |
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