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
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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