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When the x's are equally spaced, the calculation of and can be simplified by coding the x's by assigning them the values ... , -3, -2, -1, 0, 1, 2, 3, ... when n is odd, or the values ... , -5, -3, -1, 1, 3, 5, ... when n is even. Show that with this coding the formulas for and become
The proportion of left handers is 0.10. What is the number of left handers in the sample and what notation is given to that number?
A plot of the points (x,f), where x represents the class mark of a given class in a frequency distribution and f represents its frequency, is called a frequency polygon. Construct a frequency polygon using the data in Exercise 116.
The manger plugs their data into excel and without plotting comes up with the equation for the regression line. Using this equation they estimate the produce sales for the upcoming year. What mistakes did they make? Explain.
1. using the percent passing developmental courses in shown in the table for your campus in fall 2009 what is the
the mean gross incomes of certified welders are normally distributed with the mean of 20000 and a standard deviation of
you wish to conduct an anova one wayomnibus. in order to insure you have enough power to detect differences in your
for a small sample difference of means test where n1 9 and n2 11 and we can assume the population variances are equal
Let α=0.05. What is your decision regarding the hypothesis? Write your conclusion in a sentence and discuss whether there is sufficient data to support your decision.
A bag contains 4 chips of which one is red, one is blue, one is green, and one is yellow. A chip is then selected at random from a bag and then replaced in the bag.
Describe the difference between sample and a sampling distribution. Your reply must be in complete sentences and you may use sketches to help you.
a tourist bureau for a western state conducted a study which showed that 65 of the people who seek information about
1. Using the Internet resources, find an example of a linear optimization model used in industry. Describe which industry it is or was used in and briefly discuss the problem or challenge it addressed.
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