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Identify the sample and population. Also, determine whether the sample is likely to be representative of the population. 100,000 randomly selected adults were asked whether they drink at least 48 oz. of water each day and only 45% said yes.
Let X be the number of calls you need to make until you find your friend. Give the probability mass function for X. How many calls do you expect to make until you find your friend?
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
Using a significance test, evaluate whether or not there has been a change in the percent of Internet users who download music. Provide all details for the test. (Round your value for z to two decimal places. Round your P-value to four decimal pla..
The annual returns, in percentages, on stocks A and B for three possible states of the economy are given in the table below.
The following set of data represents the number of hospitals for selected states. Find the mean, median, mode, midrange, range, variance, and standard deviation for the data?
Normal distribution with mean $60,000 and standard deviation $8000. Four electricians are selected at random from this population to be shipped to another region.
A standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs. The df for determining tcrit
Advertising coefficient is 200 and t stat is 1.75. Which of the following statements is an accurate interpretation of the situation when using an alpha of .10
Please state the steps used to perform a hypothesis test on the coefficient of correlation and provide a detailed example. Details are greatly appreciated!
For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%.
In the study of age and systolic blood pressure of five randomly selected subjects, a researcher reported the following data.
The majority of the data is basically distributed if there are enough subjects. For instance, if you collected test scores of only a few honor students, the data will most likely not be normally distributed because you would have a sample that did..
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