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The local Tupperware dealers earned these commissions last month:
At a certain college, 47 % of the students are female, and 19 % of the students major in finance. Furthermore, 8 % of the students both are female
Find a confidence interval for mean assuming that each sample is from a normal population.
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:
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