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A. Two researchers make a test concerning standardized exam performance among senior high school students in one of two local communities. Researcher A tests performance from the population in the northern community, where the standard deviation of test scores is 110 ( ); Researcher B tests performance from the population in the southern community, where the standard deviation of test scores is 60 ( ). All other things being equal, which researcher has more power to detect an effect? Explain.
B. Explain how your answer to question 3 is related to standard error. Hint: You need to refer to the formula for computing standard error in order to answer this question.
They have recorded the steady increase of the sales of these walking slippers every month. They want to figure out the upward trend in sales so they create a trend line and use linear analysis to use the slope of the line to predict sales in futur..
Last year the average deposit for all 10,000 clients was $25,000 with a standard deviation of $30,000. Do you think a small sample of 25 is enough to give them the margin of error they want? If not, how large a sample do you suggest they need to t..
a. Plot the above series. Comment on the trend and seasonal variation in the sales of hybrid cars.
Springfield Nuclear Energy Inc. bonds are currently trading at ?$1,214.95. The bonds have a face value of ?$1,000?, a coupon rate of 7.5?% with coupons paid? an
1. Use meaning of S notation and compute S(X2), (SX)2 for the following set of numbers: X= 2, 3, 5.
Homes. Funding for many schools comes from taxes based on assessed values of local properties. People's homes are assessed higher if they have extra features.
Determine two likely factors that might have caused the change. Predict the primary manner in which this change would likely impact business operations in the new market environment.
Is there sufficient evidence to reject the claim that the mean annual income of teachers in state of Utah is greater than or equal to the mean annual income of teachers in Oregon? Perform a one-tailed test.
The demand function for both products 1 and 2 has a constant elasticity: Q1 = k1 p1-ε1 and Q2 = k2 p2-ε2 where εi is the absolute value of the elasticity of demand for product i and ki is a parameter that reflects the size of the market. Sup..
abc news conducts an election day poll by randomly selecting voting precincts in new york then interviewing all voters
Problem: Overweight? Although the rules of probability are just basic facts about percents or proportions, we need to be able to use the language of events and their probabilities. Choose an American adult at random. Define two events:
A soft drink company has recently received customer complaints about its one-liter-sized soft drink products. Customers have been claiming that the one-liter-sized products contain less than one liter of soft drink.
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