Question 2.2. Which of the following distributions is most likely to approach a normal distribution? (Points : 1)
distribution of all possible sample means of sample size 90
distribution of all possible sample means of sample size 60
distribution of all possible sample means of sample size 120
distribution of all possible sample means of sample size 30
Question 1 Find the confidence interval for a population mean of 615 acres at a 90% level of confidence with a sample size of 52 and standard deviation of 27 acres. (Points : 1)
189 to 1190 acres
608.84 to 621.16 acres
452 to 4252 acres
172 to 2008 acres
Question 3 A sample was taken of computation errors on an exam: 4, 7, 3, 8, 4, 4, 6, 1, 5, 2, 4, 8, 5, 4, 5. What value should be used for the population standard deviation? (Points : 1)
none, since the population standard deviation should never be estimated
Question 5.5. Confidence interval estimates of a population parameter ________. (Points : 1)
provide a range of values within which the true value of the parameter is believed to be
specify a value that accurately predicts the population parameter
eliminates the effect of sampling error
are used solely to estimate the value of population variance
Question 6.6. All of the following are reasons why random sampling is important for statistical applications except ________. (Points : 1)
the outcomes are more readily understood and therefore really usable
solving using mathematics alone may be very difficult if not impossible
the outcome variables are complicated functions of several input random variables
sampling experiments can be used to better understand important statistics theories
Question 7.7. For a sample size of 12, the degrees of freedom are ________. (Points : 1)
Question 8.8. A quality assurance technician has checked fifteen 2-liter bottles of a soft drink finding a 99% confidence interval of 1950 ml to 2025 ml for the mean fill volume. Which of the following is true? (Points : 1)
The sample indicates that the population mean lies between 1950 and 2025 ml.
There is a 99% likelihood that the bottles are being under-filled so the bottling process should be stopped.
The technician should recalculate at a 95% confidence interval.
The sample indicates that the sample mean lies closer to 2 liters than not.
Question 9.9. Regarding the standard error of the mean, ________. (Points : 1)
as the sample size increases, the standard error increases
as the sample size decreases, the standard error decreases
as the sample size increases, the standard error decreases
it is defined as one-half of the population standard deviation
Question 10.10. A point estimate is used ________. (Points : 1)
because it’s easier to use all the values in the data set than a single value
to estimate the value of a population estimate
when the population parameter is known
only when the population proportion is not known
Question 11.11. Find the standard error of the mean when the population standard deviation is 2.4 and a sample of size 36 is taken. (Points : 1)
Question 13.13. The standard error of the mean is ________. (Points : 1)
the variance of the sampling distribution of the mean
the standard deviation of the sampling distribution of the mean
the range of the sampling distribution of the mean
the mean of the sampling distribution of the standard deviations
Question 15.15. Find the confidence interval for a population mean of 1.6 pounds at a 95% level of confidence with a sample size of 112 and standard deviation of 0.2 pounds. (Points : 1)
1.89 to 1.90 pounds
4.52 to 42.52 pounds
1.56 to 1.64 pounds
1.72 to 2.08 pounds
Question 16.16. Which of the following is a subjective sampling method? (Points : 1)
Question 17.17. The margin of error used in a confidence interval is found by ________. (Points : 1)
multiplying the standard error by zα/2
multiplying the population standard deviation and the sample size
dividing the population standard deviation by the sample
multiplying the level of confidence and the standard error
18. A sample mean of 4.56 ounces was just measured from a population of which the population mean is not known. What value should be used for the population mean? (Points : 1)
none, since the population mean cannot be estimated
the average of all the sample means
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