KFUPM |Term 041 |Date: 25/12/2004 | |
|Mathematical Sciences |STAT 211 |Duration: 10 minutes |
| |Quiz# 7 | |
|Name: |ID#: |Section#: |Serial#: |

Show your work in detail and write neatly and eligibly

1. A 95 percent confidence interval estimate will have a margin of error that is approximately + 95 percent of the size of the population mean.
Answer: False

2. Increasing the sample size will result in a point estimate that is closer to the true population value.
Answer: False

3. In estimating a population proportion, the factors that are needed to determine the required sample size are the confidence level, the margin of error and some idea of what the population proportion is.
Answer: True

4. The margin of error is: a. the largest possible sampling error at a specified level of confidence. b. the critical value times the standard error of the sampling distribution. c. Both a and b. d. the difference between the point estimate and the parameter.
Answer: C

5. An intern working for a food processing company has submitted a report in which he says that the company should use a sample size of 460 to estimate the mean weight of a packaged product. The report further states that the confidence level would be 95 percent and that he has assumed that the population standard deviation for the product weights is 0.3 pounds. However, he did not state anything about the margin of error that was used. Based on the above information, what margin of