n admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.7 years of the population mean. Assume the population of ages is normally distributed. A) Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.8 years. B) The sample mean is 20years of age. Using the minimum sample size with a 90% confidence, does it seem likely that the population mean could be within the 10% of the sample mean? Within 11% of the sample mean? Explain
Section 6.1
(please help with TI-84 calculator when possible)
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.7 years of the population mean. Assume the population of ages is
A) Determine the minimum
B) The sample mean is 20years of age. Using the minimum sample size with a 90% confidence, does it seem likely that the population mean could be within the 10% of the sample mean? Within 11% of the sample mean? Explain
(a) The minimum sample size required to construct a 90% confidence interval is ___________ students.
(Round to nearest whole number)
(b) The 90% confidence interval is( _________ , ____________ ). It (1) ___________ seem like that the population mean could within 10% of the sample mean because 10%off from the sample mean would fall (2) ___________ the confidence interval. It (3) ___________ seem likely that the population mean could be within 11% of the sample mean because 11%off from the sample mean would fall (4) ____________.
1) does or does not
2) outside or inside
3) does or does not
4) inside or outside
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