Questions from Business Statistics

Q: A sample containing years to maturity and yield for 40 corporate bonds

A sample containing years to maturity and yield for 40 corporate bonds are contained in the file CorporateBonds. a. What is the sample mean years to maturity for corporate bonds and what is the sample...

Q: CEOs who belong to a popular business-oriented social networking service

CEOs who belong to a popular business-oriented social networking service have an average of 930 connections. Do other members have fewer connections than CEOs? The number of connections for a random s...

Q: In a 2018 study, Phoenix Marketing International identified Bridgeport, Connecticut

In a 2018 study, Phoenix Marketing International identified Bridgeport, Connecticut; San Jose, California; Washington, D.C.; and Lexington Park, Maryland as the four U.S. cities with the highest perce...

Q: A sample survey of 54 discount brokers showed that the mean price

A sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at $50 per share was $33.77. The survey is conducted annually. With the historical data available, a...

Q: A survey conducted by the American Automobile Association showed that a family

A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Ni...

Q: The 92 million Americans of age 50 and over control 50 percent

The 92 million Americans of age 50 and over control 50 percent of all discretionary income. AARP estimates that the average annual expenditure on restaurants and carryout food was $1873 for individual...

Q: The Centers for Disease Control and Prevention (CDC) define a

The Centers for Disease Control and Prevention (CDC) define a healthy sleep duration to be at least seven hours per day. The CDC reports that the percentage of people who report a healthy sleep durati...

Q: The Health Care Cost Institute tracks health care expenditures for beneficiaries under

The Health Care Cost Institute tracks health care expenditures for beneficiaries under the age of 65 who are covered by employer-sponsored private health insurance. The data contained in the file Drug...

Q: Obesity is a risk factor for many health problems such as type

Obesity is a risk factor for many health problems such as type 2 diabetes, high blood pressure, joint problems, and gallstones. Using data collected in 2018 through the National Health and Nutrition E...

Q: Mileage tests are conducted for a particular model of automobile. If

Mileage tests are conducted for a particular model of automobile. If a 98% confidence interval with a margin of error of 1 mile per gallon is desired, how many automobiles should be used in the test?...