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The mean noise level of stroke floors in 20 different hospitals was 63.1 dBA, and the standard deviation was 4.1 dBA. The mean noise level for 24 hospital operating rooms was 56.3 dBA and the standard deviation was 7.5 dBA. At α = .05 can it be concluded that there is a difference in means?
A marketing agency has developed three vacation packages to promote a timeshare plan at a new resort. They estimate that 20% of potential customers will choose the day plan
The estimated simple linear regression equation minimizes the sum of the squared deviations between each value of Y and the line.
Supposing a linear relationship, use the least squares method to find the regression coefficients b 0 and b 1 .
There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. (a) Determine the standard error of the proportion.
High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of -1.34? a) strong linear correlation b) weak linear correlation c) impossible, d) calculation error no linear correlation
For the most recent year available, the mean annual cost to attend a private university in the United States was $20,182. Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is $4,400.
You are considering adding a new food product to your store for resale. Explain how many units of the new product should be purchased for resale.
During the war with Iraq in 1991 the Terraco Motor Company produced a lightweight, all terrain vehicle code named "J99 Terra" for the military. The company is now planning to sell the Terra to the public.
Calculate the mean and standard deviation of the following data sets, then produce a five number summary and box plot of data.
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.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. Check the normality assumption.
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