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PROBLEM #1 - What sample size is needed to obtain a 90 percent confidence interval for the mean protein content of meat if the estimate is to be within 1 pounds of the true mean value? Assume that the variance is 49 pounds.
PROBLEM #2 - A cable TV company wants to estimate the percentage of cable boxes in use during an evening hour. An approximation is 20 percent. They want the estimate to be at the 95 percent confidence level and within 2 percentage points of the actual proportion. What sample size is needed?
A regression of height (X, in inches) on hourly earnings (Y, in dollars), yields the following results: What is the value of b1 in the regression Y = b0 + b1X?
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
Use the Emperical Rule to find what two values 68% of the data will fall between for a data set with a mean of 219 and standard deviation of 20.
Show the sampling distribution of the mean amount of Medicare spending for a sample of fifty 2003 enrollees. What is the probability the sample mean will be within, plus or minus, $300 of the population mean?
Can you conclude that information in article is untrue? Use 0.05 significance level. Find out p-value and explain its meaning.
Which study has the higher probability of a Type II error, the 60-subject study or the 100 -subject study? Which study has higher power?
Workers at a large toxic clean up project are concerned that their white blood cell counts may have been reduced. Let x be a random variable that represents white blood cell count per cubic millimeter of whole blood in a healthy adult.
Test the claim that the actual amount of coke exceeds 12 ounces. (Note: You can use the value of $s$ as the value of $sigma$ for your hypothesis test).
Provide an overview of the problem you identified. What are some research components that could be measured in order to address the research question or hypothesis you identified? How might a researcher obtain that information?
What is the probability of selecting an accounting major, given that the person selected is a male?
Determine the mean number of times the machine was used per day.
A fastener manufacturing company uses a chi-square goodness of fit test to determine if a population of all lengths of ¼ inch bolts it manufactures is distributed according to a normal distribution.
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