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Descriptive statistics for given data.
Weekly salaries (in dollars) for a sample of registered nurses are listed.
774 , 446 , 1019 , 795 , 908 , 667 , 444 , 960
Find the range, variance, and standard deviation of the data set. Interpret the results in the context of the real-life setting.
Sample data arranged in ascending order:
Salaries of Registered Nurses
444
446
667
774
795
908
960
1019
Use exponential smoothing to forcast Aug. income. Assume that the initial forecast for Feb. is $65,000. The smoothing constant selected is x=0.1
About 72% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
Nicotine patches are often used to help smokers quit. Does giving medicine to fight depression also help? A randomized double blind experiment assigned 244 smokers to receive nicotine patches and another 245 to receive both a patch and the antidep..
How many voters required to be sampled to evaluate the proportion within 0.05 with 95% confidence?
Determine the regression equation. Determine the coefficient of determination. Do you think Mr. Profit should be satisfied with using the size of the offering as the independent variable?
Probability based on binomial distribution - evaluate the probability of x successes in the n independent trials of the experiment.
A random sample of 25 days' receipts is chosen for an audit. What is the probability that the sample mean is larger than $2,220?
Use population distribution to determine expected juror frequencies. Test researcher's claim at a = 0.01.
All standard IQ test scores are normally distributed and are set up so that the mean score is 100. However, the standard deviation differs from test to test.
What is the minimum-cost order quantity for the shoes? What are the annual savings of your inventory policy over the policy currently being used by Keith?
How many packages should be sampled in order to be 90% confident of being within 0.9% of the actual population percentage of packages delivered damaged.
Test whether the mean rate is less than 6%. Use P-value approach.
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