Question

Maureen McIlvoy, owner and CEO of a mail order business for wind surfing equipment and supplies, is reviewing the order filling operations at her warehouses. Her goal is 100% of orders shipped within 24 hours. In previous years, neither warehouse has achieved the goal, but the East Coast Warehouse has consistently out-performed the West Coast Warehouse. Her staff randomly selected 200 orders from the West Coast Warehouse (population 1) and 400 orders from the East Coast Warehouse (population 2), and reports that 190 of the West Coast Orders were shipped within 24 hours, and the East Coast Warehouse shipped 372 orders within 24 hours. Assuming α = 0.05, the observed z value is ___________________.

		-3.15
		2.42
		1.53
		0.95
		1.08

2.-

Exhibit 10-11
An insurance company selected samples of clients under 18 years of age and over 18 and recorded the number of accidents they had in the previous year. The results are shown below.

Under Age of 18	Over Age of 18
n1 = 500	n2 = 600
Number of accidents = 180	Number of accidents = 150

We are interested in determining if the accident proportions differ between the two age groups.

Refer to Exhibit 10-11. The test statistic is

		0.96
		1.96
		2.96
		3.96

3.-

Testing the difference in two population proportions is useful whenever the researcher is interested in comparing the proportion of one population that has certain characteristic with the proportion of the second population that has the same characteristic.

True

False

Answer 1

Solution: