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Question: A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and finds that the number who exercise regularly is 31 out of 120.
a. What is obt?
b. What is df for this test?
c. What is cv?
d. What conclusion should be drawn from these results?
Suppose that this test is given to 1000 students. What is the number of students that are expected to make scores between 170 and 230?
A manager of a small store wanted to discourage shoplifters by putting signs around the store saying "Shoplifting is a crime!" However, he wanted to make sure this would not result in customers buying less.
The monthly income of residents of Dayton is normally distributed with a mean of $3000 and a standard deviation of $500.
We can compare two sample means to determine if the samples were obtained from normal populations with the same mean using the "t" distribution.
Microfracture knee surgery has a 75% chance of success on patients with degenerative knees. The surgery is performed on 5 patients. Find the probability of the surgery being successful on less than 3.
the population of a certain city is now 74000 people. if the population doubles every 25 years what will the
one measure of the risk or volatility of an individual stock is the standard deviation of the total return capital
In what situations might you use probability as a manager to approach business-related problems? What are the advantages to using probability concepts in business decisions?
At the .05 significance level, can the developer conclude there is a difference in the mean income? Use the five-step hypothesis testing procedure.
Specify the appropriate null and alternative hypotheses if we wish to test the research hypothesis that the mean GHQ score for all employed men exceeds 10.
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
Using the Library, web resources, and/or other materials, find the logarithmic formula that gives the pH of a substance. State what each variable in your equation represents.
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