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Prof. Hardtack gave three exams last semester in a large lecture class. The standard deviation s = 7 was the same on all three exams, and scores
A food inspector, examining 5 jars of a certain brand of peanut butter, obtained the following percentages of impurities: 2.3; 1.9; 2.1; 2.8; 2.3
The weekly earnings of middle managers in a large corporation are approximately normally distributed with a standard deviation of 36 dollars.
A sample of 16 people are used, each one is to keep track of their time with the following result in hours.
GE fluorescent bulbs have a useful lifetime which is normally distributed. We wish to estimate mean lifetime.
A major West Coast chain of "budget fare" hotels is planning an expansion into the mid-west. The mean rate for a single room at 50 "budget fare"
Consider a 98% confidence interval to estimate a population mean based on a sample of 625 observations with a sample mean of 425 and a sample standard deviation
Refer to the accompanying Minitab display of a 95% confidence interval generated using the methods of this section
With a margin of error of 0.050; confidence level of 99% ^p and ^q unknown, what is the minimum sample size required to estimate a population proportion
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children
If in a probability distribution you got the sum of probabilities less than one, it may mean that you skipped some possible outcome/outcomes
Analyze the output above to determine what percentage of complete full service oil changes will fall between 13 and 20 minutes?
The data (in square millimeters) are shown below:
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?