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Using the data on the table below, are there any correlations between population changes for the areas listed.
A sample of 49 households is taken from a population in which the standard deviation is 7. The standard error of the mean is:
Never forget that even small effects can be statistically significant if the samples are large. Of 148 small businesses, 106 were headed by men
A manufacturer would like to estimate the average number of copies that can be made from a single bottle of toner
A sample of n=16 scores is obtained from an unknown population. The sample has a mean of M=46 with SS=6000.
A random sample of 28 observations from a normally distributed population produced a mean x( bar over x = 24.2 and a standard deviation s =2.56.
Use the following information to construct the confidence intervals specified to estimate µ
A random sample of 500 measurements on the length of stay in hospitals had sample mean 5.4 days and sample standard deviation 3.1 days.
A random sample of 100 managers in Alaska had an average yearly income of $125,500 with a standard deviation of $20,000
Jennifer wants to find a 95% confidence interval for the time it takes her to get to work. She kept records for 30 days and found her average
You decide to measure the time between equipment malfunctions over a one-year period. Over that time you measured 40 electronic products
A US Navy recruiting center knows from past experience that the height of its recruits are normally distributed with mean 68 inches.
What size sample be needed to obtain the plus or minus 10 square millimeters with 99 percent confidence?
Assume the population standard deviation is 3.8 thousand dollars.
If you were constructing a 99% confidence interval of the population mean based on a sample of n = 25 where the standard deviation of the sample s = 0.05
A sample of 81 observations is taken from a normal population. The sample mean is 40, and the sample standard deviation of 5.
Calculate a point estimate and a 95% confidence interval of the mean. Assuming your data set is normally distributed, determine an appropriate sample size
The following table classifies 800 telephone calls by type (local or long distance) and by length:
A building developer has the opportunity to purchase several acres of land that is divided up into several lots for building single-family homes.
State the main points of the Central Limit Theorem for a mean.
A study by the National Park Service revealed that 50 percent of vacationers going to the Rocky Mountain region visit Yellowstone Park
For a random sample of 10 fifth generation iPod music players, the mean battery life was 9.47 hours with a standard deviation of 2.14 hours.
A survey conducted during May 20 - 22, 2005, asked 1006 Americans, "During the past year, about how many book, either hardcover or paperback
The following sample of 16 measurements was selected from a population that is approximately normally distributed:
The diameter of Ping- Pong balls manufactured at a large factory is expected to be approximately normally distributed with a mean of 1.30 inches