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Suppose you obtain a 100 bag random sample by taking 25 subgroups of 4 bags each, the mean weight of the 25 subgroups was 16.00 ounces with a total of the subgroup ranges of 87.5 oz.
The USL - 20 ounces and LSL = 13 ounces. Calculate the Cp for this process using the data from the subgroups
The USL = 20 ounces and LSL = 13 ounces. Calculate the Cpk for this process.
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
Stanford Binet IQ scores have a mean of 100 and a standard deviation of 15. Albert Einstein reportedly had an IQ of 160. Convert Einstein's IQ score to a z score.
Gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. Is there difference among kinds of gasoline?
Create a scatter plot for the data. Determine the correlation coefficient for the data.
Give three logically possible directions of casualty, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved (and why).
Thirty-five fourth-grade students were asked the traditional question "what do you want to be when you grow up? The responses are summarized in the following table:
If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means:
In the past HR uses an average of 25 vacation days per worker in order to make available man-hour and payroll predictions. Is there evidence to show that the number of vacation days decreased over the past year? Use alpha = .05
A manufacturing process makes items whose weights are normally distributed. It is known that 22.57% of all the items made weigh between 100 grams up to mean and 49.18% weigh from the mean up to 190 grams. Find out the standard deviation.
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? What is the p-value?
Name three elements of the inferential statistical analysis.
Find the probability that an eligible voter selected at random will have the following characteristics.
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