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What is a variable? List at least fi ve diff erent variables and then describe at least two levels of each variable.
For example, age is a variable. For adults, age has values that can be expressed in years starting at 18 and ranging upward.
In an actual study, the age variable might be measured by asking for actual age in years, the year of birth, or providing a choice of age ranges such as 18-34, 35-54, and 55+.
Sentence length is a variable. The values might be defi ned by the number of words in sentences that participants write in an essay.
a. how large a sample should be taken if the population mean is to be estimated with 90 confidence to within 82? the
The Awake Coffee Company produces gourmet instant coffee. The company wants to be sure that the average fill of coffee containers is 12.0 ounces.
Let X equal the number of cells activating the alarm when the temperature reaches 100_Fahrenheit. Find the probability that the alarm will function when the temperature reaches 100_F.
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What is the expected value of the probability distribution? What is the variance of the probability distribution?
construct a 95 confidence interval to estimate the population proportion with a sample proportion equal to 0.60 and a
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Suppose that the number of customers who enter a supermarket each hour is normally distributed with a mean of 570 and a standard deviation of 170.
the following data were obtained from a survey of college students. the variable x represents the number of
we have a carton of 12 rechargeable batteries contains two that are defective. in how many ways can the inspector
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