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A sample of 250 observations is selected from a normal population for which the population standard deviation is known to be 23. The sample mean is 19.
A. Determine the standard error of the mean. (Round your answer to 3 decimal places)
Standard error of the mean __________
B. Determine the 98% confidence interval for the population mean. (Round your answers to 3 decimal places)
Confidence interval _______and_______
To be 99% sure that we will not be late in completing the project, what is the requested completion time in work-days?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p- value.
What type of statistical test best assesses the relationship between job satisfaction and level of stress and what test would be appropriate to determine whether the difference between men and women is real or due to chance variation?
Explain your findings (including the logic of comparing within-group to between-group population variance estimates, how each of these is figured, and the F distribution).
With a selling price of 40 dollars each, how many pool cues must be sold to break even? What would the total revenue be at this break even point?
suppose that certain electronic components have lifetimes that are exponentially distributed fttau 1tauexp-ttaut gt 0.
At.01 significance level, is there difference in mean number of times men and women order take-out dinners in month? Determine the p -value?
A food processor is concerned that the 16 oz. can of sliced pineapple is being overfilled. The quality control department took a random sample of 50 cans and found that the arithmatic mean weight was 16.05 oz.
A window is in the shape of a square of side s, with a semicircle of diameter s above it. Write a function that expresses the total area of the window as a function of s.
The random variables, X and Y, have a probability density function given by: By transformation of variables, find the probability density function of Z=X+Y.
Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight with an error of � 0.03 grams with 90 percent confidence?
Using the data file below, construct a histogram and a frequency polygon. Describe the shape of this distribution.
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