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In several presidential elections, researchers' have observed a "gender gap" in which men and women vote for candidates in different proportions.
Based on the Nielsen ratings, the local CBS affiliate claims its 11:00 PM newscast reaches 41% of the viewing audience in the area
In a large class, the professor has each person toss a coin 200 times and calculate the proportion of his or her tosses that were heads.
What is the purpose of a hypothesis test? What goes in the null hypothesis and what goes in the alternate hypothesis?
Define and discuss the following statistical terms within the context of a business example
In 2001, the U.S. Department of Labor reported the average hourly earnings for U.S. production workers to be $14.32 per hour.
The Employment and Training Administration reported the U.S. mean unemployment insurance benefit of $238 per week (The World Almanac 2003)
Marketing executives at Haug Motor Company, producers of the world's most imposing SUVs, are planning their sales campaign for a new model
The Restaurants McBurger says that the waiting time for customers is 3 minutes with a standard deviation of population 1 minute.
Many people eat cookies with milk. Suppose a cookie company is concerned that the cookie equipment may not be functioning properly when filling 32-ounce bags.
A sample of 40 recovering alcoholics was given the State-Trait Anxiety Inventory Test (STAI).
The mean number of calories per 6-ounce can of tomato paste is supposed to be 150. A weight watchers group thought that was larger than 150.
The director of an income tax agency hires four college students, who are business majors, to help prepare taxes during the busy season.
Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether ther are more units produced on the night shift than on the day
Examine the data below showing the weights (in pounds) of randomly selected checked bags for an airline's flights on the same day
At a .05 level of significance, use Excel to test to see if the training program was effective
The pet-drug market is growing very rapidly. Before new pet drugs can be introduced into the market place, they must be approved by the U.S. Food
A researcher wants to determine whether the number of minutes adults spend online per day is related to gender.
The Dick Tracy Co. has developed micro-miniaturized circuitry that will enable them to produce a wristwatch-sized video-telecommunicator
It was claimed recently that more than 65% of high school students in the United States use computers for educational purposes. We wish to examine this claim
A manufacturing firm recruits 45 new sales staff, and sends each on one of two training courses. 25 attend course A, and 20 attend course B.
Hypothesis tests for the correlation coefficient and the slope of the least-squares regression line
Heights were measured for a random sample of 20 plants grown while being treated with a particular nutrient.
Determine the p-value for H0: p=.5 versus HA: p =/ (difference) .5 when n=225 and p^ =.54.
You are investigating the flight characteristics of different kinds of birds. You collect a sample of 33 European swallows (Hirundo rustica)