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A research analyst believes that a positive relationship exists between a firm's advertising expenditures and its sales. For 65 firms, she collects data on each firm's yearly advertising expenditures and subsequent sales. She calculates a Spearman rank correlation coefficient of 0.45.
a. Specify the competing hypotheses to determine whether advertising and sales are correlated.
b. Assume that the sampling distribution of rs is approximately normal. Calculate the value of the test statistic and the p-value.
c. At the 5% significance level, are advertising and sales correlated? Explain.
a quality control experiment is to be done on a machine that fills tubes with toothpaste. its specifications require
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Assuming that both turnover and costs have normal distributions, each with a standard deviation of $250000, what is the probability that the company makes a profit?
A haulage contractor has two loads to deliver to separate customers. He has 4 trailers of which 2 are new. If the trailers are randomly chosen for any particular delivery: (a) In how many ways can the trailers be allocated the deliveries?
Discuss the drawbacks of this process, including any drawbacks you identify that are not mentioned in the NetMBA summary.
The outlier seen in the residuals plot is a crossing by Vicki Keith in 1987 in which she swam a round trip, North to South and then back again. Clearly, this swim doesn't belong with the others. Do you think that removing it would change the model..
Use the normal-theory method to test for significant differences in 12-month mortality between the two groups.
q1. the discussion surrounding the anova is very important. this is a widely utilized statistical tool. what is the
Precisely (that is, using specific numbers) what does the central limit theorem tell us about the sampling distribution of sample means for samples of this size from this population?
Use SPSS analysis and write report to determine how this information can be used to identify the factors that influence chief executive remuneration - A graphical representation of the data and a discussion of any issues or patterns which arise f..
When variables are used as the basis for a contingency table, what scale of measurement must they represent?
Determine the probability of fatal accident over lifetime? Describe your reasoning carefully. Suppose independent events. Why might the supposition of independence be violated?
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