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A doctor wants to estimate the mean HDL cholesterol of all 20 to 29 year old females. how many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence assuming s = 19.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?
Fit the model, part a, to the data.- Give the null hypothesis for testing whether repellent type is a useful predictor of cost per use (y).
about 3 of the population has a particular genetic mutation. 500 people are randomly selected.find the mean for the
Several samples of size 9 were taken and the average range was found to be 12.9. Find the LCL for the R-chart. Round two decimal places
If the population standard deviation is 6 dogs, find the 90% confidence interval for the mean for the number of hot dogs eaten in 4 minutes.
Crickets The length in inches of a cricket chosen at random from a field is a random variable X with mean 1.2 inches and standard deviation 0.25 inches.
Suppose you were to collect data for each pair of variables. You want to make a scatterplot. Which variable would you use as the explanatory variable and which as the response variable? Why?
If the cost of the company's equity capital is 6% and the cost of debt financing is 27%, what debt-equity mix would you recommend?
Find a 95% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
what are the strengths and weaknesses of correlational and regression studies. what are the concepts of positive and
Because of tough economic times, the Indiana legislature is debating a bill that could have significant negative implications for public school funding. There are three possibilities for this bill: (1) it could be passed in essentially its current..
Imagine you are a manager at a major bottling company. Customers have begun to complain that the bottles of the brand of soda
Suppose that the incomes of all people in the United States who own hybrid (gas and electric) automobiles are normally distributed with a mean of $78,000 and a standard deviation of $8300.
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