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henry williamsFor a two-tailed test, the p-value is:
[removed] | twice the area in the tail under the the sampling distribution curve beyond the observed value of the sample statistic |
[removed] | the area under the curve between the mean and the observed value of the sample statistic |
[removed] | twice the area under the curve between the mean and the observed value of the sample statistic |
[removed] | the area in the tail under the sampling distribution curve beyond the observed value of the sample statistic The mean IQ score of a sample of 50 students selected from a high school is 88. Suppose the standard deviation of IQ's at this school is σ = 8.3. The 99% confidence interval for the population mean (rounded to two decimal places) is: The lower limit is [removed]The upper limit is [removed] |
A random sample of 95 customers, who visited a department store, spent an average of $ 71 at this store. Suppose the standard deviation of expenditures at this store is σ = $ 20. The 98% confidence interval for the population mean (rounded to two decimal places) is:
The lower limit is $[removed]
[removed]The upper limit is $
The following four steps must be taken to perform a hypothesis test using the p-value approach:
1. Calculate the p-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:
1. Calculate the p-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:
[removed] | 2, 3, 1, 4 |
[removed] | 4, 2, 1, 3 |
[removed] | 3, 2, 1, 4 |
[removed] | 4, 1, 2, 3 |
[removed]The mean federal income tax paid last year by a random sample of 34 persons selected from a city was $ 4346. Suppose the standard deviation of tax paid in this city is σ = $ 749. The 95% confidence interval for the population mean (rounded to two decimal places) is:
The lower limit is $[removed]
[removed]The upper limit is $
[removed]A sample of size 91 from a population having standard deviation σ = 6 produced a mean of 45. The 99% confidence interval for the population mean (rounded to two decimal places) is:
The lower limit is [removed]
[removed]The upper limit is [removed]
[removed]
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