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For a two-tailed test, the p-value is:
twice the area in the tail under the the sampling distribution curve beyond the observed value of the sample statistic
the area under the curve between the mean and the observed value of the sample statistic
twice the area under the curve between the mean and the observed value of the sample statistic
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
The upper limit is
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 $
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:
2, 3, 1, 4
4, 2, 1, 3
3, 2, 1, 4
4, 1, 2, 3
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 $
The upper limit is $
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
The upper limit is
