From a population consisting of 8,000 elements, a sample of size 121 is selected. The sample has a mean of 4,000 and a standard deviation of 600.
a. Estimate the standard error of the mean.
b. Develop an approximate 95 confidence interval for the population mean.
c. Estimate the population total.
d. Develop an approximate 95 confidence interval for the population total.
Q. 2There are three statistics used to measure variability in a data set; the range, the ____________________, and the ____________________.
Fill in the blank(s) with correct word
Q. 3Simple random sampling has been used to obtain a sample of 81 elements from a population of size 500 . The sample mean is 120, and the sample standard deviation is determined to be 36.
a. Estimate the standard error of the mean.
b. Develop an approximate 95 confidence interval for the population mean.
c. Estimate the population total.
d. Develop an approximate 95 confidence interval for the population total.
Q. 4According to the Empirical Rule, if the data form a bell shaped normal distribution approximately ____________________ percent of the observations will be contained within 3 standard deviations around the mean.
Fill in the blank(s) with correct word
Quick Reply
