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Question: A CBS News poll taken in December 2009 asked a random sample of 1048 adults in the United States, "In general, do you think the education most children are getting today in public schools is better, is about the same, or is worse than the education you received?" About 34% said "Better," 24% said "About the same," and 38% said "Worse." (The remaining 4% were unsure.)
a. What is the population for this survey?
b. What is the approximate margin of error for this survey?
c. Provide an interval that is 95% certain to cover the true percentage of U.S. adults in December 2009 who would have answered "Better" to this question if asked.
The shirt was a mesh polo shirt. Given this information, what is ths probability that the mesh polo shirt came from box 1?
Here is a scenario, which uses graphical displays, and your job is to assess accuracy of the result.
A poll of 1125 adults in a certain country found that 55% identified themselves as the followers of some religion. The margin of error was 5 percentage points with 99% confidence.
Suppose nothing in this environment changes. a) Compute the probability the mean number of attacks over the next 10 years is between 500 and 600.
The thinking is that differetn networks may affect how they report the news. Calculate a value of chi-sqaure, and determine the conclusion at the 95% level of confidence
a bus passes by a certain street corner every morning around 900 a.m. let x be the difference in minutes between the
A month later, the reading skills of all 100 students are assessed to determine whether the program was successful. What are the two populations of interest in this study?
For which of the variables depicted in the histograms would you most strenuously insist on using an IQR rather than a standard deviation to summarize spread? Explain.
A student organization at a small business college claims that the average class size is greater than 35 students. Test this claim at α " 0.02, using the following sample of class size:
Using a random sample of 100 newly-packed Chococake, it is found that the mean shelf life is 154 hours. Can the cake house manager conclude that the new packaging technique is efficient at 0.01 significance level?
What is the best estimate of the average obesity percentage for these countries? What is the standard deviation for the listed obesity rates?
explain the concept and application of uniform
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