The following samples are observations taken from the same elements at two different times:
Unit Sample 1 Sample 2
1 15.1 4.8
2 12.3 5.7
3 14.9 6.2
4 17.5 9.4
5 18.1 2.3
6 18.4 4.7
Assume that the populations are normally distributed and construct a 90 confidence interval for the difference in the means of the distribution at the times in which the samples were taken.
A) (7.6232, 13.4434)
B) (5.2825, 15.8127)
C) (6.8212, 14.7821)
D) (7.4122, 14.6801)
Q. 2The following data represent a random sample of bank balances for a population of checking account customers at a large eastern bank.
Based on these data, what is the 95 percent confidence interval estimate for the true population mean?2,300 756 325 1,457 208 2,3451,560 124 356 3,179 457 789120 2,760 998 508 210 789A) Approximately 1,069 484.41
B) About 839.40 to 1,298.60
C) Approximately 1,069 2.1098
D) None of the above
Q. 3If the mean age for all students that attend your university is 24.78 years,
it would be reasonable to expect that the mean of a sample of students selected from that population would also equal 24.78 years as long at the sampling is done using sound statistical methods.
Indicate whether the statement is true or false
Q. 4Determine the projected revenue for selling the projected number of standard suites.
A) 20,938.78
B) 20,762.98
C) 30,491.55
D) 72,193.31
Q. 5The following paired samples have been obtained from normally distributed populations. Construct a 90 confidence interval estimate for the mean paired difference between the two population means.
Sample Population 1 Population 2
1 3,693 4,635
2 3,679 4,262
3 3,921 4,293
4 4,106 4,197
5 3,808 4,536
6 4,394 4,494
7 3,878 4,094
A) -571.92 -172.51
B) -487.41 -283.89
C) -812.21 -72.61
D) -674.41 -191.87
Q. 6The Crystal Window Company makes windows at three locations: Reno, Las Vegas, and Boise. Some windows made by the company contain a visible defect and must be replaced. Each defect costs the company 45.00.
The Reno plant makes 40 percent of all windows while the Las Vegas and Boise plants split the remaining production evenly. A recent quality study shows that 8 percent of the Reno windows contain a defect, 11 percent of the Las Vegas windows contain a defect, while 4 percent of the windows made in Boise have a defect. Once the windows are made, they are shipped to a central warehouse where they are commingled and the location where they were made is lost.Based on this information, if a defective window is discovered, it was most likely made by the Las Vegas plant. Indicate whether the statement is true or false
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