| 1 |
The difference of upper and lower limits of confidence interval measures the |
- A. level of significance
- B. level of confidence
- C. interval
- D. precision
|
| 2 |
Level of significance is denoted by |
- A. 2 - α
- B. 3 - α
- C. α
- D. 1 - α
|
| 3 |
A single value used to estimate a population value is called: |
- A. Interval estimate
- B. Point estimate
- C. Confidence interval
- D. Level of confidence
|
| 4 |
The precision can be increased by ---------------- the sample size |
- A. increasing
- B. decreasing
- C. changing
- D. ignoring
|
| 5 |
Statistic is an estimator and its calculated value is called: |
- A. Biased estimate
- B. Estimation
- C. Interval estimate
- D. Estimate
|
| 6 |
Types of statistical inferences are |
- A. one
- B. two
- C. three
- D. four
|
| 7 |
If 1-α = 0.90, the value of Z<sub>a/2</sub> is: |
- A. 1.645
- B. 1.96
- C. 2.326
- D. 2.575
|
| 8 |
A range of values used to estimate an unknown population parameter is |
- A. a point estimator
- B. An interval estimator
- C. an unbiased estimator
- D. A biased estimator
|
| 9 |
The probability associated with confidence interval is called: |
- A. Level of confidence
- B. Confidence coefficient
- C. Both A and B
- D. Confidence limits
|
| 10 |
Confidence intervals which are often used in practice are |
- A. 90%
- B. 95%
- C. 98%
- D. all of these
|
