Questions from Statistical Techniques

Q: A study of the effect of television commercials on 12-year

A study of the effect of television commercials on 12-year-old children measured their attention span, in seconds. The commercials were for clothes, food, and toys. At the .05 significance level, is t...

Q: Three assembly lines are used to produce a certain component for an

Three assembly lines are used to produce a certain component for an airliner. To examine the production rate, a random sample of six hourly periods is chosen for each assembly line and the number of c...

Q: The Quick Change Oil Company has a number of outlets in the

The Quick Change Oil Company has a number of outlets in the metropolitan Seattle area. The daily number of oil changes at the Oak Street outlet in the past 20 days are: The data are to be organized...

Q: To prevent spam from entering your email inbox, you use a

To prevent spam from entering your email inbox, you use a filter. You are interested in knowing if the number of spam emails differs by day of the week. The number of spam emails by day of week is cou...

Q: There are four McBurger restaurants in the Columbus, Georgia, area

There are four McBurger restaurants in the Columbus, Georgia, area. The numbers of burgers sold at the respective restaurants for each of the last 6 weeks are shown below. At the .05 significance leve...

Q: A task requires the completion of four activities. A teacher would

A task requires the completion of four activities. A teacher would like to know if differences in the sequence of the four activities results in different task completion times. The teacher selects th...

Q: Each of three supermarket chains in the Denver area claims to have

Each of three supermarket chains in the Denver area claims to have the lowest overall prices. As part of an investigative study on supermarket advertising, a local television station conducted a study...

Q: There are four radio stations in Midland. The stations have different

There are four radio stations in Midland. The stations have different formats (hard rock, classical, country/western, and easy listening), but each is concerned with the number of minutes of music pla...

Q: Robert Altoff is vice president of engineering for a manufacturer of household

Robert Altoff is vice president of engineering for a manufacturer of household washing machines. As part of a new product development project, he wishes to determine the optimal length of time for the...

Q: Refer to the Baseball 2016 data, which report information on the

Refer to the Baseball 2016 data, which report information on the 30 Major League Baseball teams for the 2016 season. a. At the .10 significance level, is there a difference in the variation in team sa...