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Consider again the two variables described in Exercise 18.39, test grade and speed in taking the test. Imagine that each of the following numbers represents the Spearman correlation coefficient that quantifies the relation between these two variables-test grade converted to ranks such that the top grade of 98 is ranked 1, and speed in taking the test with the fastest person ranked 1. What does each coefficient suggest about the relation between the variables? Using the guidelines for the Pearson correlation coefficient, indicate whether each coefficient is roughly small (0.10), medium (0.30), or large (0.50). Specify which of these coefficients suggests the strongest relation between the two variables as well as which coefficient suggests the weakest relation between the two variables. [You calculated the actual correlation between these variables in Exercise 18.39(b).]a. 1.00b. - 0.001c. 0.52d. - 0.27e. - 0.98f. 0.09
question the proportion of successes in a random sample of 400 was calculated as 50.a. estimate the population
Suppose the amount of minutes used per month is distributed normally with a mean of 700 minutes and a standard deviation of 120 minutes. What is the probability that more than 820 minutes were used?
Regardless of which you choose, try to make an argument to support each choice. Estimate what the standard deviation of this distribution will be.
A diabetic is interested in determining how the amount of aerobic exercise impacts his blood sugar. When his blood sugar reaches 170 mg/dL.
1. for a month following a presidential illness very few homes were sold. afterwards the realty business returned to
A special test is given to people complaining of sever headaches. if someone has a brain tumor, the test is positive with a probability of .8 (80%).
What is the best predicted test score for a student who spent 7 hours preparing for the test? Find the standard error . Use formula or MS Excel.
He surveyed a random sample of 250 families and found that 142 owned some type of stock. At the 0.05 significance level, can the survey be considered.
Design and First Question on Response Rates for a Mail Survey of Skydivers" (Leisure Science, 1991) tested this theory by experimenting with different cover designs.
Reconsider Prob. 10.4-3, which involves trying to find the probability that a project will be completed by the deadline. Assume now that the duration of each activity has a triangular distribution that is based on the three estimates in the manner..
The weighs of newborn elephants are normally distributed.
Let X1, X21 • • • Xio denote a random sample of size 10 from a population which has a normal distribution with unknown mean 0 and variance a2 = 2. (a) Find the Uniformly Most Powerful (UMP) test of size a = 0.01 for testing the simple hypotheses
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