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A psychologist has designed a questionnaire to measure individuals' aggressiveness. Suppose that the scores on the questionnaire are normally distributed with a standard deviation of 100. Suppose also that exactly 10% of the scores exceed 750. Find the mean of the distribution of scores. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
The necessary information has been collected from a random sample of 100 respondents drawn from a local community.
A researcher is interested in determining the proportion of public elementary schools that have a mandatory school uniform policy. The researcher randomly sampled n=400 public elementary schools and found that 100 of the schools have a mandatory s..
a researcher is interested in whether students who attend private elementary schools do any better on s standard test
Hypothesis test of the claim has been conducted and that the conclusion of the test was to reject the null hypothesis. Identify the population to which the results of the test apply.
In passing, Ben also cryptically comments: By testing the signs of the endpoints of the intervals, it is possible to break mul-interval into nine cases, only one of which requires more than two multiplications. Rewrite this procedure using Ben'..
the sample of test scores is given below. create a relative frequency histogram of the data with 5 classes. describe
The linear correlation coefficient r is
suppose that in bags of christmas mampms half of the mampms are supposed to be red and the other half green. in a bag
What is the coefficient of determination and what does it tell us about the relationship between two variables?- For a set of data, r2 is 0.64 and the variables x and y are inversely related. What is the numerical value of r?
States. The stem-and-leaf display shows populations of the 50 states and Washington, DC, in millions of people, according to the 2000 census.
Is the treatment effect the same in different regions of the cornea? It may be inefficient to consider each region separately. A simple way to summarize the treatment effect over all five regions is to use an average.
Assume that the population average for adults is 6 hours and 57 minutes, or 6.95 hours of sleep per night, with a standard deviation of 2 hours.
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