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A sample of 25 novels has a standard deviation of 9 pages. Find the 95% confidence interval of the population standard deviation. (LET SD be the symbol for standard deviation as in sigma)
consumers turned to their mobile devices in growing numbers and increasing frequency throughout 2010. text messaging
When it comes to advertising, "'tweens" are not ready for the hard line messages that advertisers often use to reach teenagers. The Geppeto Group study found that 78% of 'tweens understand and enjoy ads that are silly in nature.
question a market research team compiled the following discrete probability distribution for families residing in
the average of chemical engineers is 39yrs with a standard deviation of 4rs. if an engineer firm employs 24 chemical
Develop a point estimate of the number of minutes per day officeworkers waste trying to locate mislabeled, misfiled, or misplaced items.
What are the implications of statistical variation? Why are we interested in understanding and measuring variation?
Compute a 95% confidence interval for the population mean, based on the sample 1, 2, 3, 4, 5, 6, and 30. Change the number from 30 to 10 and recalculate the confidence interval.
How many observations were in the original data set? In the bottom row of the stem and leaf display identify the stem the leaves and the numbers in the original data set represented by this stem and its leaves.
if you have four similar elements in active parallel with a time to failure density function of ft0.005e-0.005t what is
What do we know about the behavior of the sample mean ( X ) in this setting? B) If the sociologist decides to scale down his study and draw a sample of n =10.
Draw a histogram showing the 20 sample means. (Use classes -0.5 to 0.5, 0.5 to 1.5, 1.5 to 2.5 and so on). Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
schadek silkscreen printing inc. purchases plastic cups on which to print logos for sporting events proms birthdays
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