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Acidity of rainwater. The Normal quantile plot in Figure 3.32 (page 143) shows that the acidity (pH) measurements for rainwater samples in Exercise 3.38 are approximately Normal. How well do these scores satisfy the 68-95-99.7 rule? To find out, calculate the mean and standard deviation s of the observations. Then calculate the percent of the 105 measurements that fall between - s and + s and compare your result with 68%. Do the same for the intervals covering two and three standard deviations on either side of the mean. (The 68-95-99.7 rule is exact for any theoretical Normal distribution. It will hold only approximately for actual data.)
A group of six people play the game of "odd person out" to determine who will buy refreshments. Each person flips a fair coin.
He promptly sold it for ?$121,154. What annual interest rate would he need to earn on an ordinary annuity for a comparable rate of? return?
a study of 35 white mice showed that their average weight was 4.7 ounces. the standard deviation of the population is
a new design for the braking system on a certain type of car has been proposed. for the current system the true average
What percentage of the bank's customers carries average daily balances below of $200? What percentage of the bank's customers carries average daily balances between $300 and $700?
Contemplate what you have learned about nonfiction literature, and conduct research to answer the questions on this worksheet. Be sure to use proper citations and references.
Add a constant of 2 to each score. Calculate the mean for the new values. Generalize to answer the question, "What is the effect on the mean of adding a constant to each score?"
If the population standard deviation is 18.8 days, find the 90% confidence interval for the average number of days worked by all employees who are paid through payroll departments.
Construct one bar graph illustrating the relationship between sales and income for each separate year of Amazon's existence.
For the variable you identify another graphical display that might be useful and construct it. What conclusions can you reach from this other plot that cannot be made from the boxplot?
What is the calculated chi-square statistic and What are the degrees of freedom - Write a short description of your results, including the level of statistical and substantive significance, the direction of the association, and whether any low expe..
The May 1, 2007, College Retirement Equity Fund (CREF) prospectus lists the following sample returns on $1 invested in two of the fund's accounts, per year.5
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