An estimation of a population parameter believed to contain the value of believe

Question

An estimation of a population parameter believed to contain the value of believed to contain the value of the parameter is known as From a population with a standard deviation of 20, a sample of 100 Items is selected. At 95% confidence, the margin of error is In order to determine an interval for the mean of .1 population with unknown standard deviation a sample of 87 Items is selected. The mean of the sample is determined to be 30. The number of degrees of freedom for reading the t value Is In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 students over a one week period. Assume the population standard deviation is 1.2 hours. The standard error of the mean is

Explanation / Answer

10) a. Confidecne onterval gives an interval in which the parameter value is expected to lie.

11) c. Formula is 1.96*s/sqrt(n)=1.96*20/10

12) c. degrees of freedom is n-1.

13) d. formula is s/sqrt(n).

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