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A government association claims that more than 44% of adults in the United States do volunteer work. You work for a volunteer organization and are interested in analyzing this claim. You find that in a random sample of 1165 adults, 556 do volunteer work. (Round numeric answers to 3 decimal places and/or the nearest tenth of a percent unless otherwise specified.)
You wish to construct a 90% confidence interval for the population proportion, p, in order to test the claim from a confidence interval point of view.
1. What is the best point estimate for p?
2.What is the critical value, zc for this estimate?
3.What is the standard deviation of the sampling distribution?
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
For a sample with n=36, the mean duration of a geyser is 3.55 minutes and the standard deviation is 0.63 mintues. Using chebychev's theory, determine at how many of the eruptions lasted between 2.29 and 4.81 mintues.
Statistical aptitude scores are known to be normally distributed, with mean = 50. A researcher has designed a new program intended to improve students statistical aptitude, and has enrolled a sample of 30 students in it.
Interpret the interaction graph in terms of what it shows about the three effects tested.
In this paper present the Construction of confidence Intervals and the Proper Interpretation of confidence Intervals and show appropriate examples in the education environment.
The amount of corn chips dispensed into a 10 ounce bag by the dispensing machine has been identified at possessing a normal distribution with a mean of 10.5 ounces and a standard deviation of .2 ounces.
What is the probability that none are a commercial success?
Electrical connectors manufactured by a supply company last an average of 18.2 months and follow a normal distribution with a standard deviation of 1.7 months.
The regression of Y on X predicts? When predicting Y, adding a second predictor variable to the first predictor variable X.
A survey of middle-aged men reveals that 28% of them are balding at the crown of their heads. Moreover, it is known that 18% of all middle-aged men who have this balding pattern will suffer a heart attack in the next 10 years.
A group of children can be classified according to eye color (blue, brown, green), gender (male, female), and hobby (collecting stamps, collecting baseball cards, collecting shells, collecting stickers).
An oil co. is drilling some wells. the results are described as either a dry well or a producer well. Past experience suggests that 10% of exploratory wells are producer wells.
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