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A large department store wants to test whether the variance of waiting time in two checkout counters is approximately equal.
Two independent random samples of 25 waiting times in each of the counters gives s1 = 2.5 minutes and s2 = 3.1 minutes. Carry out the test of equality of variances, using α = 0.02.
The following data are numbers of color television sets manufactured per day at a given plant:- Draw a frequency polygon and an ogive for these data.
Give an example of using the distributive property for a negative monomial times a trinomial with different signs on the terms [for example: -3x(2xy + 3y - 2x)] and show each step of the distribution.
complete the hypothesis test with alternative hypothesis ?d lt 0 based on the paired data that follow and d m - n. use
the following is a set of data for a population with n 10 7 5 11 8 3 6 2 1 9 8a. compute the population mean.b.
What is the interquartile range for this data set?- What can you say about the skewness of this data set?- If a data point that was originally 13 is changed to 14, how would the box plot be affected?
If university officials say that at least 70% of the voting student population supporting the fee increase, what conclusion can be drawn based on a 95% level of confidence?
1.from previous polls it is believed that 66 of likely voters prefer the incumbent. a new poll of 500 likely voters
Is there evidence that a stock split causes excess returns for the month following the split? Redo the problem, using the sign test. Compare the results of the sign test with those of the Wilcoxon test.
Given the five constraints listed above, how many valid three-digit area codes are there? - Given the five constraints listed above, how many valid seven-digit phone numbers are there?
What signified to you on all of the problems that required a binomial distribution that you were to use a binomial distribution? Which problems required a binomial distribution?
identify a situation where the central limit theorem is useful and will give you a more accurate
a bag contains 3 red marbles 4 green ones 1 lavender one 3 yellows and 2 orange marbleshow many sets of five marbles
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