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A statiscal abstract includes the average per captia income for each of 15 states. When those 15 valuse are added, then didvided by 15, the result is $29,143.11. Is $29,143.11 the average per captia income for all individuals in the 15 states? Why?
A survey on the drinking habits of Americans estimated the percentage of adults across the country who drink beer, wine, or hard liquor at least occasionally. Of the 1516 adults interviewed, 985 said that they drank.
Describe a different example of where the independent variable, while highly correlated to the dependent variable, does not cause the dependent variable to change directly.
A geological study indicates that wells drilled in a certain area should strike water with probability 0.2. Find the probability that:
Suppose 31% offer both retirement plans and life insurance as benefits. If a small company is randomly selected, determine the following probabilties:
What role do z-scores play in this transformation of data from multiple distributions to the standard normal distribution? What is the relationship between z-scores and percentages?
List the 15 possible samples (without replacement) of two artists that can be selected from the six. for brevity, use the initial provided.
A simple random sample of pages from Merriam-Websters Collegiate Dictionary is obtained. Listed below are the numbers of words defined on those pages
Let X be the number of individuals in a simple random sample of size 50 from this population who get some relief by taking ibuprofen, and let pˆ be the sample proportion. Find the probability that the value of p is in the interval
Calculate the standard deviation of the sample mean for samples of size 1, 4, 25, 100, 250, 500, 1000, and 5000. Graph your results with the sample size on the x axis and the standard deviation on the y axis.
question an instructor graded a large number of midterm exams and she considers that the test scores are normally
If a simple random sample of 50 players was taken, what is the probability that the sample mean will exceed $210,000?
the loaves of rye bread distributed to local stores by a certain bakery have an average length of 30 centimeters and a
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