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Pollsters attempt to find out whether or not person is a "likely voter" before they count their opinion in poll. If we suppose 40% of registered voters will really vote, in the random sample of 100 registered voters we can be 95% confident that somewhere between _____ and _____ of them will really vote. Fill in the blanks with the number.
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
As part of this trial, they want to find out whether there is a difference between effectiveness for women and for men. At = .05, what is the test value?
Give an example representing a discrete probability distribution and another example representing a continuous probability distribution. Explain why your choices are discrete and continuous.
Test whether the music reduces studying capacity at a .05 level of significance.
Assume that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
Scores for men on the verbal portion of the SAT test are normally distributed with a mean 509 and a standard deviation of 112. Randomly selected men are given the Columbia
Consider the experiment of tossing a fair coin three times and observing the number of heads that result (X = number of heads).
With the test statistic you chose, work out the problem with solution using .05 level of significance if it applies.
In the year 2006 the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. A random sample of round-trip discount fares on this route last month gives:
List all corner points and determine which combination of items will produce the maximum profit.
In the real world, given null hypothesis is false; but the collected data lead to the null hypothesis being accepted. That is, the data lead to a failure to reject null hypothesis.
With more then a million teachers set to retire we are seeing a record number of turnovers in the teaching profession.
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