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As part of your job as Alumni President, you are interested in finding information about graduates and jobs. You are planning to conduct a study whereby you will be able to estimate the average annual salary of all graduates who continue to work for the same company they originally joined upon graduation. A telephone survey is planned. In order to conduct the sample design, you conduct a quick convenience survey of only 30 graduates that you know and find that 4 out of 10 are still with the first company they joined after graduation, their average salary is $65,000, and 29 out of the 30 respondents indicated their salary was between $55,000 and $75,000.
a) What size random sample should you take if you want to estimate the annual salary in the population with 99 percent confidence and a maximum margin of error of $250?
b) A fellow researcher tells you that the response rate on your telephone survey is likely to be 80%. Thus, how many alumni should you pick from the sample frame and then proceed to call.
Create a 95% confidence interval for population mean. Is it sensible that population mean is 28 weeks? give explanation for your answer.
The average monthly cost per household for groceries in kentucky is $625/mo with a standard deviation of $125/mo. The average age of the memebers in each of the households in Kentucky is 22.5 yr with a standard deviation of 5.175 yr. Which data se..
If Household is selected at random, find out the probability that it feels economic conditions are good?
At α = 0.10 test the claim that there is a difference in means of the salaries. (a) State the Hypotheses: (b) Compute the Test statistic: (Round off correctly)
A professor wants to conduct a study to know whether the grades she gives to her students affect their evaluations of her. She teaches four classes of ten students each.
Probability based on normal distribution. Suppose among X has a normal distribution, and find the indicated probability.
The superintendent of a printing plant has selected a random sample of 100 rolls of paper from a large shipment. The average length of the sample rolls is 416 feet, with a variance of 2704 feet.
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
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A recent study of the Greater Los Angeles Taxi Driver Association demonstrated that the average or media tariff that they charge from Hermosa Beach to the International Airport of Los Angeles is $18.00
The researchers found that subjects who answered immediately made the best decisions and that "the longer our participants thought about their answers, the more likely they were to include irrelevant information at the expense of relevant informat..
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your rea..
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