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A consumer products testing group is evaluating two competing brands of tires, Brand 1 and Brand 2. Though the two brands have been comparable in the past
Explain each of the 5 hypothesis steps individually and in detail.
A consumer electronics firm has developed a new type of remote control button that is designed to operate before becoming intermittent.
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample deviation is 15.
Mary claims to be able to hypnotically cause her clients to perform significantly higher on the SAT. The national mean is 1200 with a standard deviation
A furniture store claims that a specially ordered product will take, on average, M = 35 days (5 weeks) to arrive. The standard deviation of these waiting times
A company implemented a safety program designed to reduce the number of work related injuries. Human Resources department collected the following data
You have collected the following data from two suppliers. Are the suppliers significantly different at the 0.05 level of significance?
Dunkin Donuts advertises that a dozen of their donuts weighs about 43 oz. A certain baker has figured out that she can stay out of trouble with her manager
In an investigation of the possible brain damage due to alcoholism, CAT scans were used to measure brain densities in eleven chronic alcoholics.
A personal computer manufacturer is interested in comparing assembly times for two keyboard assembly processes
The data that you will be using for this exercise came from a survey of two insurance carriers.
You are provided with the male and female unemployment data for the 1960-2005 periods.
The Business Administration department at a local university delivers some of its courses using online instruction
How investors assess the stability of a public company? What are the key financial ratios that measure the stability of an organization? Define stability.
A hypothesis states a difference exists between two populations. Sometimes this is an obvious conclusion because the means will be very different
To find the percentage of women between 58 and 80 inches, remember percentage equates with area which is a total of 1.
What are Type I and Type II errors? Why do you want to avoid them?
It seems these days that college graduates who are employed full-time work more than 40-hour weeks. Data are available that can help us decide if this is true
In recent years, a growing array of entertainment option competes for consumer time. By 2004, cable television and radio surpassed broadcast television
Periodically Merrill Lynch customers are asked to evaluate Merrill Lynch¯Financial consultants and services (2000 Merrill Lynch Client Satisfactory Survey)
A magazine is considering the launch of an online edition. The magazine plans to go ahead only if it's convinced that more than 25% of current readers
How does statistics enrich and represent the results of a study? How can statistics be used to misrepresent the results of a study?
T-tests, independent samples, paired and one-way t-tests expalined. When shoud they be used and what kind of data should they be used on?
The amount of money out of income spent on housing is an important component of the cost of living.