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A researcher studies children in elementary school and finds a strong positive linear association between height and reading scores.
a) Does this mean that taller children are generally better readers?
b) What might explain the strong correlation?
a medical treatment has a success rate of 0.8. two patients will be treated with this treatment. assuming the results
find the critical value. assume that the test is two-tailed and that n denotes the number of pairs of data. n 7 a
The number of claims N in a year has a discrete distribution: Pr[N=k]=0.1(4-k) for k=0,1,2,3. The amount for each claim has mean 300 and variance 30000. The distribution of amount per claim is independent of N. Calculate the mean and variance of t..
a random sample of 70 printers discovered that 30 of them were being used in small businesses. find the 95 confidence
Calculate and interpret the effect size for this test and calculate and interpret any post-hoc test if necessary - Conduct all 6 steps of an independent-samples t test. Be sure to label all six steps
manufacture of a certain component requires three different machining operations performed sequentially. machining time
Provides a measure of skewness in the distribution of X. Determine the value of b3 for this distribution and using a suitable distributional approximation, find the probability that the mean of a random sample of n = 25 observations will exceed 2.5.
Security B has an expected return of 12 percent, a standard deviation of returns of 10 percent, a correlation with the market of 0.7 and a beta coefficient of 1.0.
At 90% confidence, what is the margin of error (to 4 decimals)? Use critical value with three decimal places Develop a 90% confidence interval for the population proportion of adults who think the future health of Social Security is a major economi..
Is there an alternative test to the chi squared test? What if my results give an expected frequency below 5, which stats book states that these should be treated with caution?
Find out the mean sum of squares of the treatment in one way ANOVA.The profits of individual traders in three departments, labelled by A, B and C, in a medium sized firm were recorded on one day.
At the .10 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes. What is the decision rule?
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