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A survey was completed to estimate the proportion of residents in support of constructing a new football stadium, at tax payer expense, to accommodate an NFL team in the LA area. It was found that 71 of 100 LA city residents favored the construction while 78 of 135 residents in the rest of the county were in support. Determine if there is a significant difference between the proportion of city and the other county residents in support of the stadium construction. State your hypotheses and use a P-value in your argument.
The sampling distribution of mean score is approximately Normal. It has mean. What is its standard deviation?
a. Formulate the null and alternative hypotheses. b. Which statistical test would you use? Why?
The heights of adults in one town have a mean of 66.3 inches and a standard deviation of 3.3 inches. What can you conclude from Chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches..
In the North American court system, a defendant is assumed innocent until proven guilty. In an ideal world, we would expect that the truly innocent will always go free, whereas the truly guilty ones will always be convicted.
Assume that the average person in America weighs 150 pounds (μ). You want to determine whether colleges students weigh less than the average America, Following are the weights collected on a sample of colleges students: 120, 105, 166, 170, 145, 14..
The Ohio Department of Agriculture tested 203 fuel samples across the state in 1999 for accuracy of the reported octane level. For premium grade, 14 out of 105 samples failed
A street performer approaches you to make a bet. He shows you three cards: one that is blue on both sides, one that is orange on both sides, and one that is blue on one side and orange on the other.
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
A college class believes that the average grade average of psychology students and the average grade averages of biology students are different.
Please use words to describe the solution, not just symbols. (basically, explain what is going on in addition to an answer) Use a math symbol editor where appropriate.
Based on the empirical data determine the following probabilities:
Why is statistical significance not necessarily of practical important difference to a business decision? Provide an example and explain.
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