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A marketing firm wants to estimate the average amount spent by patients at the hospital pharmacy. For a sample of 65 randomly selected patients, the mean amount spent was $93.50 and the standard deviation was $13.25.
(a) 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.
(b) Interpret this confidence interval and write a sentence that explains it.
Is there any reasonable explanation for the two months that have the highest frequencies?
Random samples of size 64 are taken from a large population whose mean is 160 and whose standard deviation is 25. What is the mean of the sampling distribution of the sample mean?
Normally distributed with the mean income of $30,000 and standard deviation of $3,000. Determine the income which separates top 25% from lower 75% of incomes?
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
I performed a linear regression for the Population to the monthly profit, but do not understand how to use the information. And I do not understand the confidence interval estimate; how do I use and decipher the info.
Karefree State University has an enrollment of 18,000. Researchers took a sample of 900 and found 477 students wanted a Field Hockey team. Construct the 95% and 99% Interval estimates for the population proportion.
A radio station that plays classical music has a "By Request" program each Saturday night. The percentage of requests for composers on a particular night are listed below:
There is enough evidence at a significance level of 10%, to conclude that the content average sodium this brand of corn flakes is 130 milligrams?
Using any present or past job related data, perform an ANOVA in either Excel or MegaStat. Write your null and alternate hypothesis. Post your ANOVA table. Interpret the results.
What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?
In estimating a 95% confidence interval estimate of the average number of days absent for the company's workers last year should you use a z or t value in the formula?
Can you can tell the difference between coke and pepsi in a blind taste test? Most people say they can and have a preference for one brand or another.
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