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A sample of the sales at 50 Haute Dog restaurants is taken and the sample mean is $30,000 per day. with a sample standard deviation of $2000. The population standard deviation is not known.
A. What is the 90% confidence interval for the daily sales at all restaurants.
B. What is the probability that the average sales are really $32,000 or more per day? Assume that the population average is $30,000 per day and the std. Deviation is $2k.
Draw two pie charts, which allow the total yearly exports to be compared. Explain the trend in the export of fish as shown in the two pie charts.
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In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
Is there a difference in the mean allowances nationally and the mean allowances in northwestern Ohio for nine-year-olds?
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Find the mean ______________ and the standard deviation _____________
The assembly time for a product is uniformly distributed between 6 to 10 minutes.
If the city manager knows the average salary nationally is $38,300, which test of significance should be used? Why?
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
Using one mean t test to determine whether or not to support the claim - hypothesis test that WORKS THE SAME as the z-test
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
The number of widgets produced by 9 employees in an eight hour shift is recorded as: 135, 120, 116, 119, 121, 125, 135, 131, 123. What is the median of the number of widgets produced presented above?
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