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The Centers for Disease Control and Prevention reported a survey of randomly selected Americans age 65 and older, which found that 411 of 1012 men and 535 of 1062 women suffered from some form of arthritis.
Create a 95% confidence interval for the difference in proportions of senior men and women who have the disease.
A) (0.095 , 0.101)
B) (0.062 , 0.134)
C) (0.055 , 0.140)
D) (-0.134 , -0.062)
the diameter of a shaft is normally distributed with mean 0.2508 inch and standard deviation of 0.0008 inch. the
Find the standard error of mean. Also establish an interval estimate around the sample mean using one standard deviation of the mean.
question refer to the article entitled 21st birthday from the penn state pulse january 2001. located in the library
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
Test the hypothesis that the average price is higher than $1.87. Use level of significance α = 0.05.
a roulette wheel has 38 slots numbered 0 00 and 1 to 36. the slots 0 and 00 are colored green 18 of the others are red
the usa corps of engineers is considering two different loaders that move large amounts of fill per load. as a result
you play two games against an opponent. the probability you win the first game is 0.7. if you win the first game the
assume that the population proportion of all business professionals who select an airline based on price is 0.25. a
Suppose that 30% of the population has black hair. In a randomly-selected group of six people, how probable is it that
If two people are randomly selected, what is the probability both are hopelessly romantic? What is the probability at least one is hopelessly romantic.
The lifetime of zzz batteries are normally distributed with a mean of 270 hours and a standard deviation of 10n hours. Find the number of hours that represent the 40 th percentile.
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