23. 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.
Maureen's alternate hypothesis is _______
24. Ophelia O'Brien, VP of Consumer Credit of American First
Banks (AFB), monitors the default rate on personal loans at the AFB
member banks. One of her standards is "no more than 5% of personal
loans should be in default." On each Friday, the default rate is
calculated for a sample of 500 personal loans. Last Friday's sample
contained 30 defaulted loans. Ophelia's null hypothesis is _______.
25. Catherine Chao, Director of Marketing Research, is evaluating
consumer acceptance of a new toothpaste package. Her staff reports
that 17% of a random sample of 200 households prefers the new
package to all other package designs. If Catherine concludes that
17% of all households prefer the new package, she is using _______.
26. The empirical rule says that approximately what percentage of
the values would be within 2 standard deviations of the mean in a bell
shaped set of data
27. Medical Wonders is a specialized interior design company
focused on healing artwork. The CEO, Kathleen Kelledy claims that
artwork has healing effects for patients staying in a hospital, as
measured by reduced length of stay. Her current client is a children’s
cancer hospital. Kathleen is interested in determining the effect of
three different pieces of healing artwork on children. She chooses
three paintings (a horse photo, a bright abstract, and a muted beach
scene) and randomly assigns six hospital rooms to each painting.
Kathleen's null hypothesis is _____________