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1. Why do researchers care how much variability exists in a set of data?
2. Distinguish between descriptive and inferential statistics.
3. Conceptually, what does the variance tell us about a set of data?
University officials at a major university would like to use three -term moving averages to examine enrollment. Enrollment data (in thousands of students) for the 12 most recent terms are shown in middle column of the table below.
the claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.30 and the sample
question approximately 80 of workers are sure that they will be able to retire at 65 years of age. suppose 10 workers
Neither subjects nor researcher knew who was assigned to what. Determine three terms explain the experimental design?
(a) The scores that high school juniors get on the verbal part of the PSAT/NMSQT test may be looked upon as values of a random variable with the mean μ = 41. Find an upper bound to the probability that one of the students will get a score of 65 or..
If the supplier selects the pairs of earrings at random, what is the chance that the jewelry store gets exactly two sets of platinum pairs?
a researcher wishes to estimate the percentage of adults who support abolishing the penny. what size sample should be
What is the significance of the picture at the top of the t-table? What is the difference between a sample parameter (X-bar and s) and a proportion parameter (n)?
Determine Probability using exponential distribution.The average time between failures of a laser machine is exponentially distributed with the mean of 40,000 hours.
Of all 3 to 5 year old children, 56% are enrolled in school. A sample of 500 children age 3 to 5 year old is ramndom selected. Find the probability that at least 250 children are enrolled in school.
a researcher is studying test anxiety using a standardized instrument that has a mean of 50 and a standard deviation of
Let P(x,y) be x has been to y, where the domain of discourse for x is all students in this class, and the domain of discourse for y is all countries in the world. Express the following propositions in English.
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