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1. Pedro wants to determine a 99 percent confidence interval for the true proportion of times he rolls a 6 (using a fair, 6-sided die). How many rolls must Pedro make to get a margin of error less than or equal to .05? [To find n, use the guessed value p* = 1/6 for the sample proportion and the values for z* from Table C.] [Round to the smallest integer that works.] n =____.
2. Dylan wants to determine a 80 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must he have to get a margin of error less than 0.04? [To find n, use the value p* = 1/2 for the sample proportion and the values for z* from Table C.][Round to the smallest integer that works.] n =____.
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated.
given that the probability density function is fx thetaxtheta-1for testing parameter theta ho theta 1 and h1 theta 2
an article in the american statistician m. l. r. ernst et al. scatterplots for unordered pairs 50 1996 pp. 260-265
If the service manager wants to 95% confident that the overall time is correctly estimated, with a 3 percent probability of error, what sample size should be taken.
Suppose prior elections in Louisiana indicated it is necessary for a candidate for governor to receive at least 80 percent of the vote in the northern part of the state to be elected.
when is it appropriate to use an anova? what is the key piece of information you must know in order to
Determine the variance of firm's profit for the month.
Consider the following data on 20 chemical reactions, with Y = chromatographic retention time (seconds) and X = molecular weight (gm/mole).
What conclusions can you draw about the nature of the relationship between anxiety and exam performance?
Determine the critical z values. Suppose that normal distribution applies. Right-tailed test; standard deviation = 0.04.
the qualifying speed for a championship race is 145.65 mph and the standard deviation is 9.45 mph. only drivers who
Stratum 2 contains 500 invoices, stratum 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed. What type of sampling should you do? Why?
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