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A researcher randomly sampled 30 graduates of an MBA program and recorded data concerning their starting salaries. Of primary interest to the researcher was the effect of gender on starting salaries. The result of the?pooled-variance t?-test of the mean salaries of the females? (Population 1) and males? (Population 2) in the sample is provided. The researcher was attempting to show statistically that the female MBA graduates have a significantly lower mean starting salary than the male MBA graduates. What assumptions were necessary to conduct this hypothesis? test?
Test the hypothesis that the choice of the major by undergraduate students in this university is independent of their gender. Use α = 0.01.
Use the Tukey-Kramer procedure to determine which mutual fund type has the highest average percentage gain. Use an experiment-wide error rate of 0.05.
Suppose we are testing if the true mean amount of gas sold on a day is less than 900 gallons, at a 5% level of significance, the value of z* would be?
Preference to change blades is recorded. Do the data support the twin-blade manufacturer's claim? α=.05. This is a t-tests independent samples.
It is one thing to note the number of people who do not respond to a survey, but few then go on the ask for reasons. Many people have speculated on the reasons, but one survey which routinely asks is the Family Resources Survey for the UK conducte..
Lemarks Studios is looking for advertiser dollars to help with production costs on its newest blockbuster movie. Lemarks Studios has several companies that want product placement in the film.
Use the Wilcoxin Rank Sum test for independent samples to determine if the median age of a car and a taxi are different.
To estimate the percentage of households in the United States that use a DVD player, a researcher surveys a randomly selected sample of 500 households.
1. What were the major commercial centers in the Afro-Eurasian world? How did they fostercommercial exchange and establish a new commercial class?
You are not satisfied with knowing an upper limit and would like a closer approximation of the probability that the bowl will not be empty.
The standard for this material requires that impact strength must be greater than 1.0ft-lb/in. The sample average and standard deviation obtained were 1.25 and 0.25 respectively.
Assuming this is true, determine the expected spread in the number (i.e., mean ± 1 standard deviation) of home buyers (from sample of 20 home buyers) that will do some remodeling to their home within the first 5 years of home ownership.
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