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Suppose a previous study has shown the sample standard deviation of a particular model of automobile to be 3.12 mpg. How large a sample is necessary to estimate the mean miles per gallon to within 0.25 mpg with 95% confidence?
Interpret the results at α = .01. (c) Is normality assured? (d) Is the difference large enough to be important? (e) What else would medical researchers need to know before prescribing this drug widely?
Check that the formula (1) holds when X Unif(0, b). Formula (1) also works for b = 1. Check this when X is an Exponential RV with PDF f(x) = e-x for x 0.
a coin is tossed 4 times and the sequence of heads and tails is observed.a. what is the probability that heads and
lifetime of a motherboard is modeled by a gamma distribution with parameters r80 and gamma 4 years-1. compute the
Combining all of the games played, what proportion did the Yankees win? Compute the z statistic and its P-value. What conclusion do you draw?
To help schedule staffing and equipment needs, a large hospital uses a multiple regression model to predict its 'bed census' y, the number of beds occupied at the end of each day.
State the formula for the test statistic and show your decision rule using the 1 percent level of significance. (c) Carry out the test. Show your work. (d) What assumptions are required?
find the z-score location of vertical line that separates normal distribution as described in each of the followinga.
Compare and contrast how the psychologist as a detective (a researcher) solves a problem to how a non-researcher solves a problem.
Suppose that the mean of the annual return for common stocks from 2000 to 2012 was 8.5%, and the standard deviation of the annual return was 25.2%.
the traditional view about the normal curve in psychology is that normal curves area rare in nature but often occur in
Find the value of q-hat from proportion and degrees of freedom used to find the t-score.
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