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Question: Various claims are often made for surveys. Why is each of the following claims not correct?
a) It is always better to take a census than to draw a sample.
b) Stopping students on their way out of the cafeteria is a good way to sample if we want to know about the quality of the food there.
c) We drew a sample of 100 from the 3000 students in a school. To get the same level of precision for a town of 30,000 residents, we'll need a sample of 1000.
d) A poll taken at a statistics support Web site garnered 12,357 responses. The majority said they enjoy doing statistics homework. With a sample size that large, we can be pretty sure that most Statistics students feel this way, too.
e) The true percentage of all Statistics students who enjoy the homework is called a "population statistic."
if the mean value of a set of data including 6 sample tests is 20 and the standard deviation of the data is 5 what is
Find the mean, median, and mode(s) of the observations in problem 2.- Find the median and the 20th, 30th, 60th, and 90th percentiles.
Population of following N=5 scores: 0,6,4,3, and 12. Calculate μ and σ for the population. Determine the z-score for each score in the population.
The politician's advisors estimated the proportion supporting her fiscal policy to be .60. How large of a sample is required?
A box contain 9 tickets numbered from I to 9 inclusive. If 3 tickets are drawn from the box one at a time, find the proba bility that they arc alternately either ( I ) odd, even, odd or (2) even, odd, even.
three-way catalytic converters have been installed in new vehicles in order to reduce pollutants from motor vehicle
In a random sample of 34 quarterback 2012 season ratings, the sample mean was = 57.09. Is there any evidence to suggest that the true mean quarterback rating has increased? Use a = 0.05 and compute the p value.
If you choose 12 vehicles at random, what is the probability that more than half(that is, 7 or more) carry just one person?)create a probability distribution table and a cumulative distribution.
(a) If subject #77 gets 10 hours of coaching, what does Dr. Smith expect for this subject's Math SAT score? (b) If subject #77 gets 20 hours of coaching, what does Dr. Smith expect for this subject's Math SAT score? (c) If subject #99 gets 10 hours o..
What is the connection between speaking, listening, reading and writing? What are some of the principles that effective educators can use to help support these skills?
Football weights. The Sears Cup was established in 1993 to honor institutions that maintain a broad-based athletic program, achieving success in many sports.
Identify the design using R × C notation.- Name the independent variables, their levels, and the dependent variable.- Calculate SStot, SScells, SSgender, SShandedness, SSAB, and SSerror.
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