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Four hundred draws are made at random with replacement from a box. The average of the draws is 152.4, and their SD is 18. Someone claims that the average of the box equals 150. Is this plausible?
What proportion of 1040R tax forms will be completed in more than 114 minutes? Round your answer to at least four decimal places.
The monthly sales volume (in thousands of dollars) for a manufacturer of snow skis is seasonal (there tend to be more skis sold during fall and winter months than during warmer months). The following table shows the monthly seasonal indexes for th..
Is it reasonable to conclude that the distribution is normally distributed with a mean of $10 and a standard deviation of $2? Use the .05 significance level.
the corner convenient shop sells two flavored cookies strawberry and vanilla. data show that 23 customers buy
Throughout history 55% of registered voters actually have cast a ballot. What is the probability that among a group of 28 students who are registered voters more than 19 will vote?
A nationally standardized test is scaled so that the normally distributed scores have a mean of 80 and a standard deviation of 10 in the population. If we have a group of 25 scores from this test, and compute the mean, what is the probability that th..
A car rental office checks out an average of 30 cars per day with a standard deviation of 8 cars. If a sample of 25 days of operation is selected and the sample mean is computed.
Make a worksheet in Excel for your calculations. (b) Make a histogram of the data. Would you be justified in using a parametric t test that assumes normality? Explain.
The largest salary on the list is $100,000 and is accidentally changed to $1,000,000. What is the new standard deviation?
The test statistic for a two-sided significance test for a population mean is z = -2.12. What is the corresponding P -value?
They find that these 100 people lost an average of 38 hours with a standard deviation of 9.5 hours. What is the P-value for this significance test?
A pair of dice is rolled. The sum of the faces on top is observed. What are the expectation, variance, and standard deviation of the observed sum? The Expectation and Variance Template attached to the main posting is optional and recommended.
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