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Pet ownership and gender. In the Health ABC Study, 595 subjects owned a pet and 1939 subjects did not.23 Among the pet owners, there were 285 women; 1024 of the non-pet owners were women. Find the proportion of pet owners who were women. Do the same for the non-pet owners. Give a 95% con?dence interval for the difference in the two proportions. (Be sure to let Population 1 correspond to the group with the higher proportion so that the difference will be positive.)
The most important material reclaimed from beverage bottles is PET plastic. A serious impurity is aluminum, which later can clog the filters in extruders when the recycled material is used.
These plot yields followed approximately a normal distribution with mean 88 lb and SD 7 lb. Find the probability that any one randomly selected plot yield is greater than 90 lb.
1. the random sample of five observations in exercise 1-1 found ? 11.2 and s2 9.2. state your assumptions and
problem 1 - of a random sample of 600 trucks at a bridge 114 had bad signal lights. construct a 95 percent confidence
the appropriate t-value to use when constructing a 95 confidence interval for a sample size of 12
Develop forecasts for the years 6 through 13 using a 5-year moving average and Weight the most recent year by 6, the previous year by 4, the year before that by 2, and the other years by 1.
Its mean is 139 and its standard deviation is 12. Approximately how many terms can you expect to find between the values of 115 and 163?
What is the probability that the sample mean will be between M = 510 and M = 520? In symbols, what is p (510
Your new project is coming in over budget and requires a cost change through the cost change control system. The cost variance was projected using which of the following tools and techniques?
in order to evaluate the reasonableness of a firms stated total value of its parts inventory an auditor randomly
the population mean is 75. a random sample of 48 items is selected from the population. what is the probability that
Use Chebyshev's theorem to find what percent of the values will fall between 120 and 150 for a data set with mean of 135 and standard deviation of 7.5.
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