## [answered] A sample of size 98 from a population having standard devia

A sample of size 98 from a population having standard deviation ? = 6 produced a mean of 41. The 99% confidence interval for the population mean (rounded to two decimal places) is:

The lower limit is

The upper limit is

The mean federal income tax paid last year by a random sample of 31 persons selected from a city was \$4220. Suppose the standard deviation of tax paid in this city is ? = \$719. The 95% confidence interval for the population mean (rounded to two decimal places) is:

The lower limit is \$

The upper limit is \$

A random sample of 84 customers, who visited a department store, spent an average of \$74 at this store. Suppose the standard deviation of expenditures at this store is ? = \$16. The 98% confidence interval for the population mean (rounded to two decimal places) is:

The lower limit is \$

The upper limit is \$

The mean IQ score of a sample of 58 students selected from a high school is 95. Suppose the standard deviation of IQ's at this school is ? = 7.0. The 99% confidence interval for the population mean (rounded to two decimal places) is:

The lower limit is

The upper limit is

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This question was answered on: Sep 18, 2020

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