A company has 600 employees. A random sample of 49 employees took a computer literacy test. The sample resulted in a mean score of 75 with a standard deviation of 21.
a. Estimate the standard error of the mean.
b. Develop an approximate 95 confidence interval for the population mean of the 600 employees.
Q. 2According to the Empirical Rule, if the data form a bell shaped normal distribution approximately ____________________ percent of the observations will be contained within 1 standard deviation around the mean.
Fill in the blank(s) with correct word
Q. 3A simple random sample of size 36 is selected from a population of size 750 . The sample mean is 318, and the sample standard deviation is found to be 30.
a. Estimate the standard error of the mean.
b. Develop an approximate 95 confidence interval for the population mean.
Q. 4According to the Empirical Rule, if the data form a bell shaped normal distribution, approximately ____________________ percent of the observations will be contained within 2 standard deviations around the mean.
Fill in the blank(s) with correct word
Q. 5A university has 5,000 students. The manager of food services at the university is interested in determining the total lunch expenditure. A simple random sample of 121 lunch receipts was selected. The sample showed an average of 3 with a standard deviation of .40.
a. Estimate the standard error of the sample mean.
b. Develop an approximate 95 confidence interval for the population mean.
c. Estimate the population's total expenditure for lunch.
d. Develop an approximate 95 confidence interval for the total expenditure for lunch.
Q. 6Which of the following statements is true regarding the data set 8, 8, 8, 8, and 8?
a. The range equals 0.
b. The standard deviation equals 0.
c. The coefficient of variation equals 0.
d. All of these choices are true.
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