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At a large university, the graduation rate for the general student body was reported to be 0.66. Consider the distribution of sample proportion graduating for random samples of 5 students, compared to the distribution for random samples of 50 students.
a. Compare the centers of the distributions for 5 versus 50 students.
b. Compare the spreads of the distributions for 5 versus 50 students.
c. Compare the shapes of the distributions for 5 versus 50 students.
For the following data, verify that you do not reject with the ANOVA F testing with α = .05, but you do reject with Welch's test.- What might explain the discrepancy between the two methods?
Create a graph with the trendline displayed for each of the three different regressions. What are the least squares regression line equations for each of the three different regressions?
Construct a control chart for the proportion of dissatisfied customers. Revise the control limits, assuming special causes for points outside the control limits.
In some situations, the sizes of sampled specimens vary, and larger specimens are expected to have more defects than smaller ones. For example, sizes of fabric samples inspected for flaws might vary over time. Alternatively, the number of items in..
suppose the reaction temperature x in acircdegc in a certain chemical process has a uniform distribution with a -8 and
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Obtaining uniform random numbers as instructed at the beginning of the Problems section, use the acceptance-rejection method to generate three random observations from the triangular distribution used to illustrate this method in Sec. 22.4.
Assuming that the standard deviation and the normal shape are unchanged, to what level must the mean reduce so that 20 gallons per week is the third quartile rather than the mean?
For the total population of a large southern city, mean family income is $34000, with a standard deviation (for the population) of $5000.
a binomial probability is given. write the probability in words. then use a continuity correction to convert the
a set of 200 score is normally distributed with a mean of 60 and a standard deviation of 12 . what are the z scores
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