1. Estimation is a procedure by which we assign a numerical value or numerical values to the:
| A | sample statistic based on the information collected from a population |
| B | population parameter based on the information collected from a sample |
| C | population parameter based on the information collected from a population |
| D | sample statistic based on the information collected from a sample |
2. A sample of size 100 from a population having standard deviation?= 6 produced a mean of 47. The 99% confidence interval for the population mean (rounded to two decimal places) is:
The lower limit is _____
The upper limit is _____
3. The mean federal income tax paid last year by a random sample of 40 persons selected from a city was $4267. Suppose the standard deviation of tax paid in this city is ? = $978. The 95% confidence interval for the population mean (rounded to two decimal places) is:
The lower limit is $_____
The upper limit is $_____
4.A researcher wants to test if the mean price of houses in an area is greater than$145,000. The alternative hypothesis for this example will be that the population mean is:
| A | greater than or equal to $145,000 |
5. A researcher wants to test if elementary school children spend less than 30 minutes per day on homework. The alternative hypothesis for this example will be that the population mean is:
| C | less than or equal to 30 minutes |
6. Thep-value is the:
| A | smallest significance level at which the null hypothesis can be rejected |
| B | smallest significance level at which the alternative hypothesis can be rejected |
| C | largest significance level at which the null hypothesis can be rejected |
| D | largest significance level at which the alternative hypothesis can be rejected |
7. The following four steps must be taken to perform a hypothesis test using thep-value approach:
1. Calculate thep-value.
2. Select the distribution to use.
3. Make a decision.
4. State the null and alternative hypotheses and determine the significance level.
The correct order for performing these steps is:
8. A random sample of 88 customers, who visited a department store, spent an average of$75 at this store. Suppose the standard deviation of expenditures at this store is?=$22. The 98% confidence interval for the population mean (rounded to two decimal places) is:
The lower limit is $_____
The upper limit is $_____
9. The mean IQ score of a sample of 62 students selected from a high school is 89. Suppose the standard deviation of IQ's at this school is ? = 7.2. The 99% confidence interval for the population mean (rounded to two decimal places) is:
The lower limit is _____
The upper limit is _____
10. For a two-tailed test, thep-value is:
| A | the area under the curve between the mean and the observed value of the sample statistic |
| B | twice the area under the curve between the mean and the observed value of the sample statistic |
| C | the area in the tail under the sampling distribution curve beyond the observed value of the sample statistic |
| D | twice the area in the tail under the the sampling distribution curve beyond the observed value of the sample statistic
|
Solution: QNT275-Estimation is a procedure by which we assign a numerical