Tuesday
October 21, 2014

Homework Help: Statistics 2

Posted by Steven on Monday, December 16, 2013 at 1:21pm.

The body temperature of healthy human beings can be assumed to have a normal distribution with mean  and standard deviation . Body temperature measurements taken from a sample of 130 healthy individuals shows the sample mean temperature to be 98.249O F and sample standard deviation to be 0.733O F. Based on this information:
Find a 95% confidence interval for 
The usually assumed body temperature for a healthy individual is 98.6O F. Does this fall in the above confidence interval?
Find a 90% confidence interval for 
A large employer in Toledo, Ohio is considering offering its employees certain facilities for child care. As a part of the feasibility study, the employer wants to estimate the current mean weekly cost of child care for their employees who use child care services. A random sample of 10 employees who use child care services reveals the following amounts spent last week:
$107, $92, $97, $95, $105, $101, $91, $99, $104, $95.
Find a 90% confidence interval for the population mean. State any assumptions you make in arriving as this result.

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