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Suppose that scores on a particular test are normally distributed with a mean of 120 and a standard deviationof 16 . What is the minimum score needed to be in the top 20% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place.
If the condence level is 90%, what is the probability that at least one of these confidence intervals will not contain the true population proportion?
the owners of a two-person business make their decisions independently of each other and then compare their decisions.
in a survey of 3003 adults 1450 say they have started paying bills online in the last year. construct a 99 confidence
to test for any significant difference in the number of hours between breakdowns for four machines the following data
For a random sample of 12 such runners were studied the average resting heart rate was 62 bpm with a standard deviation of 9.6 bpm. In this scenario, the value of 6.2 bpm is the
A random sample of 346 individuals is selected, and the individuals are classified according to their smoking habits and the smoking habits of their parents. The results are given in the contingency table below.
Let S = {c, h, j, q, t, y} be a sample space of an experiment and let E = {c, h}, F = {c, q, y}, and G = {h, j, t} be events of this experiment. (Enter your answers using roster notation. Enter Ø for the empty set.)
eighteen percent 0.18 of the students in a management class are graduate students. a random sample of 6 students is
What is the probability that a given (i.e. one) textbook weighs more than 5.5 pounds? Imagine the distribution of all possible samples averages of textbook weights (with n=16). What is the weight that separates the lightest 25% of sample averages f..
steve and his friends are relaxing at a local tavern. the number of drinks that steves table receives is poisson
during the national football league nfl season las vegas oddsmakers establish a point spread on each game for betting
With y 5 percent of sales quota, perform a linear regression using the other variables as predic- tors. Interpret the partial regression coefficients and the R2 value for the model. At the 0.05 level, is the model significant?
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