Questions from Business Statistics

Q: The mean airfare for flights departing from Buffalo Niagara International Airport during

The mean airfare for flights departing from Buffalo Niagara International Airport during the first three months of 2017 was $320.51. Assume the standard deviation for this population of fares is known...

Q: Table 1.7 shows data for eight phones (Consumer Reports

Table 1.7 shows data for eight phones (Consumer Reports). The Overall Score, a measure of the overall quality for the phone, ranges from 0 to 100. Voice Quality has possible ratings of poor, fair, goo...

Q: The file Snow contains temperature and snowfall data for 51 major U

The file Snow contains temperature and snowfall data for 51 major U.S. cities over 30 years. For example, the average low temperature for Columbus, Ohio, is 44 degrees and the average annual snowfall...

Q: After deducting grants based on need, the average cost to attend

After deducting grants based on need, the average cost to attend the University of Southern California (USC) is $27,175. Assume the population standard deviation is $7400. Suppose that a random sample...

Q: Three firms carry inventories that differ in size. Firm A’s inventory

Three firms carry inventories that differ in size. Firm A’s inventory contains 2000 items, firm B’s inventory contains 5000 items, and firm C’s inventory contains 10,000 items. The population standard...

Q: Reuters reports that 15 percent of Australians smoke. By introducing tough

Reuters reports that 15 percent of Australians smoke. By introducing tough laws banning brand labels on cigarette packages, Australia hopes to ultimately reduce the percentage of people smoking to 10%...

Q: Lori Jeffrey is a successful sales representative for a major publisher of

Lori Jeffrey is a successful sales representative for a major publisher of college textbooks. Historically, Lori obtains a book adoption on 25% of her sales calls. Viewing her sales calls for one mont...

Q: In 2018, the Simple Dollar website reported that the mean life

In 2018, the Simple Dollar website reported that the mean life of 14-watt compact fluorescent lights (CFLs) is 8000 hours. Assume that for this population the standard deviation for CFL life is 480. S...

Q: According to USC Annenberg, the mean time spent by Americans on

According to USC Annenberg, the mean time spent by Americans on the Internet in their home per week is 17.6 hours. Assume that the standard deviation for the time spent by Americans on the Internet in...

Q: Undeliverable Mail Pieces. Of the 155 billion mailpieces the U.

Undeliverable Mail Pieces. Of the 155 billion mailpieces the U.S. Postal Service (USPS) processed and delivered in 2017, 4.3% were undeliverable as addressed. Suppose that a brief questionnaire about...