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A researcher believes that the percentage of people who exercise in California is greater than the nation 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 the x² obt?
b. What is df for this test?
c. What is x² cv?
d. What conclusion should be drawn from these results?
The average price of a home is reported to be $203,190. Use this price as the population mean, and assume the population standard deviation is 43,890.
A sample of 15 workers reveal the following minutes: 29, 38, 38, 33, 38, 21, 45, 34, 40, 37, 42, 30, 29, 35. Develop 98% confidence interval for the population mean. Interpret your result.
public transportation and the automobile are two methods an employee can use to get towork each day. samples of times
Find a 95% confidence interval for the long-run proportion of new product placements?
If garage is robbed, determine the probability doors were left open?
Testing for population proportion - evidence that the proportion of data processing clerks who have gone through the new training and are no longer employed is less than .25?
Use the Internet or other resources to find an example of a research article in a professional journal of interest to you, and not in daily periodicals or weekly publications. Prepare a synopsis of the article including the following:
A telemarketing company wants to find out if people are more likely to answer the phone between 8pm and 9pm than between 7pm and 8pm.
Senator Hayes is considering a a run for the U.S. presidency, but she is only 35 years of age, which is the minimum required age. While investigating this issue, she finds the ages of past presidents when they were inaugurated
The mean return for a random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Build a 95 percent confidence interval for mu, population mean.
Flying over the western states with mountainous terrain in a small aircraft is 40% riskier than flying over similar distances in flatter portions of the nation. Find the probability of no accidents in 100,000 flight operations.
a distribution has a standard deviation of s 12. find the z- score for each of the following locations in the
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