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Question: An economist wishes to estimate, to within six months, the mean time between sales of existing homes, with 95% confidence. Estimate the minimum size sample required. In his experience virtually all houses are re-sold within 40 months, so using the Empirical Rule he will estimate σ by one-sixth the range, or 40/6 = 6.7.
Why is statistical significance not necessarily of practical important difference to a business decision? Give an example and explain.
At the 0.05 level of significance, could the population slope and the population coefficient of correlation be zero? Determine the 95% confidence interval for the population slope.
If heads is a success when we flip a coin, getting a six is a success when we roll a die, and getting an ace is a success when we draw a card from an ordinary deck of 52 playing cards, find the mean and the standard deviation of the total number o..
There are 100 boxes, and for each i = 1, 2, . .. 100, box i contains proportion I /100 of gold coins (the rest are silver), one box is chosen at random.
a. Why would the random variable y, defined as y 5 x2 2 x1, be of interest to the furniture manufacturer? b. What is the mean value of the random variable y? c. Assuming that x1 and x2 are independent, what is the standard deviation..
a lot of 50 items has two defective items and 48 nondefective items. a random sample of 5 items is to be selected from
One school found that 28.6% of all students are liberal. You wonder whether this percentage is different at your school, but don't know whether it's higher or lower. What hypotheses will you test to see if your school significantly differs from th..
1) A)What is the expected CD4 count for patient taking supplements who has had HIV for 2.5 years?
Let G be an unambiguous CFG without λ-productions. (a) If x L(G), show that the number of steps needed to derive x is linear in the length of x.
a. How many variables are there in this study? What are the levels of any variable you identified? b. What hypothesis test would be used to analyze these data?
A petroleum company intends to drill for oil in four different wells. Use the subscripts 1,2,3,4 to denote the different wells.
Construct the ANOVA table (i.e. compute the between and within SS) and test if there appears to be any differences in means (use α = 0.05)
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