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An article in the Washington Post stated that nearly 45% of the U.S. population is born with brown eyes, although they don't necessarily stay that way. To test the newspaper's claim, a random sample of 80 people was selected, and 32 had brown eyes.
Construct a 99% confidence interval for the population proportion of brown eye people in the United States.
At α = .05, is there a difference in variances? Illustrate all steps clearly, including the illustration of the decision rule.
A confidence interval estimate for the population mean is given to be (40.45, 49.24). If the standard deviation is 11.159 and the sample size is 35, answer each of the following (show all work):
what is the proportion of the total area under the normal curve within plus and minus two standard deviations of the
The probabilities .9 and .1 respectively. Give the probability distribution for daily sales. Find the mean and standard deviation of the daily sales.
Using realistic numbers for values of degrees of freedom, sample size, F-ratio, confidence interval and post hoc results; report hypothetical results in a few sentences using APA format.
Can the company conclude that the pill is effective at promoting weight loss? Write the hypotheses and conduct the appropriate hypothesis test.
A random sample of 72 statistics students was taken to estimate the proportion of students who are also in the Math Club. The 90% confidence interval was 0.438 to 0.642. Using this information, what sample size would be necessary to estimate the t..
a company that bakes chocolate chip cookies averages 5.2 chocolate chips per cookie. assume that the number of
question an electronics company is about to launch a new product. if the serial number for each piece produced has
a describe the distribution of x height of male college students.a skewed rightb approximately normalc skewed leftd
What is an example of two variables that are likely to be correlated because they are both changing over time?
Assume the following summary statistics, which describe the speed of a computer processor, are available from a sample of Intel Pentium IV chips manufactured at the company's Arizona chip plant (values are in Megahertz):
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