Questions from Business Statistics

Q: The National Sleep Foundation used a survey to determine whether hours of

The National Sleep Foundation used a survey to determine whether hours of sleep per night are independent of age. A sample of individuals was asked to indicate the number of hours of sleep per night w...

Q: On a television program, two movie critics provide their reviews of

On a television program, two movie critics provide their reviews of recent movies and discuss. It is suspected that these hosts deliberately disagree in order to make the program more interesting for...

Q: Test the following hypotheses by using the χ2 goodness of fit test

Test the following hypotheses by using the χ2 goodness of fit test. H0: pA = .40, pB = .40, and pC = .20 Ha: The population proportions are not pA = .40, pB = .40, and pC = .20 A sample of size 200 yi...

Q: Reconsider the observed frequencies in exercise 1 a. Compute the

Reconsider the observed frequencies in exercise 1 a. Compute the sample proportion for each population. b. Use the multiple comparison procedure to determine which population proportions differ signif...

Q: Many medical professionals believe that eating too much red meat increases the

Many medical professionals believe that eating too much red meat increases the risk of heart disease and cancer. Suppose you would like to conduct a survey to determine the yearly consumption of beef...

Q: The following data are believed to have come from a normal distribution

The following data are believed to have come from a normal distribution. Use the goodness of fit test and α = .05 to test this claim.

Q: During the first 13 weeks of the television season, the Saturday

During the first 13 weeks of the television season, the Saturday evening 8 p.m. to 9 p.m. audience proportions were recorded as ABC 29%, CBS 28%, NBC 25%, and independents 18%. A sample of 300 homes t...

Q: Mars, Inc. manufactures M&M’s, one of the

Mars, Inc. manufactures M&€™s, one of the most popular candy treats in the world. The milk chocolate candies come in a variety of colors including blue, brown, green, orange, red, and ye...

Q: The Wall Street Journal’s Shareholder Scoreboard tracks the performance of 1000 major

The Wall Street Journal’s Shareholder Scoreboard tracks the performance of 1000 major U.S. companies. The performance of each company is rated based on the annual total return, inclu...

Q: The National Highway Traffic Safety Administration reported the percentage of traffic accidents

The National Highway Traffic Safety Administration reported the percentage of traffic accidents occurring each day of the week. Assume that a sample of 420 accidents provided the following data. a. C...