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Six people have declared their intentions to run for a county commission seat in the next general election. A political poll is conducted three-quarters of the way into the campaign to determine if there are any clear preferences on the part of the voters. One thousand twenty randomly-selected voters were asked to indicate their choice. The responses are presented in the table. (Use the Ch-square method.)
Candidate Number of responsesA 180B 240C 200D 130E 125F 145
Test the appropriate hypothesis to determine if there is a preference among the candidates. (Let the significance level = 0.05)
If the top 15% of the test scores are usually good enough for admission to law school, find the cut off score for gaining admission.
Based upon all of this information, do a "goodness-of-fit" test to see if the distributions are the same as they were two years ago. Use a level of confidence of .01. Should we accept Ho or reject Ho?
A study to get a quick idea of the medical acceptability of a new aspirin substitute which cannot be dispensed over the counter without prescription.
Research question: Are the mean crash damages the same for these three vehicles?
In standardized form, the normal distribution a) Has a mean of 0 and a standard deviation of 1 b) Has a mean of 1 and a variance of 0 c) Has an area equal to 0.5 d) Cannot be used to approximate discrete probability distributions
Give an example of some data that you could analyze with a Chi Square. Discuss the level of measurement that you would need to use this test.
Replacement times for CD players are normally distributed with mean of 7.1 years and a standard deviation of 1.4 years (based on data from "Getting Things Fixed," Consumer Reports). Find the probability that a randomly selected CD player will have..
Outline the difference between the t test for independent groups and the t test for matched groups. A researcher computed the F ratio for a four-group experiment.The computed F is 4.86. The degrees of freedom are 3 for the numerator and 16 for the ..
Acme plumbing supply just received a shipment of 5,000 stainless steel valves, but 50 regular steel valves were also sent. There is no way to tell the difference between the valves.
For the following hypothesis test where H 0 : m £10 vs. H a : m >10, we reject H 0 at level of significance a and conclude that the true mean is greater than 10 when the true mean is really 8.
Using the finite population correction factor, compute the standard error for each of the three firms given a sample of size 50.
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
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