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Here again is the data on expense ratio (%) for a sample of 20 large-cap blended mutual funds introduced in Exercise 1.53:
A normal probability plot shows a distinctly nonlinear pattern, primarily because of the single outlier on each end of the data. But a dotplot and boxplot exhibit a reasonable amount of symmetry. Assuming a symmetric population distribution, does the data provide compelling evidence for concluding that the population mean expense ratio exceeds 1%? Use the Wilcoxon test at significance level. 1.
Exercise 1.53: A mutual fund is a professionally managed investment scheme that pools money from many investors and invests in a variety of securities. Growth funds focus primarily on increasing the value of investments, whereas blended funds seek a balance between current income and growth. Here is data on the expense ratio (expenses as a % of assets, from www .morningstar.com) for samples of 20 large-cap balanced funds and 20 large-cap growth funds ("largecap" refers to the sizes of companies in which the funds invest; the population sizes are 825 and 762, respectively):
Calculate and compare the values of x, ,x , and s for the two types of funds.
b. Construct a comparative boxplot for the two types of funds, and comment on interesting features
A nursing professional conducts an analysis to examine scores on the mental health service and treatment outcome questionnaire.
Consider some decision-making situations in Business Management field of study, and describe two or more in which tests of one or more population variances are important.
Customers arrive at the rate of four per minute at a large bank branch in downtown Seattle. In its advertis ing, the bank stresses that customers will receive ser vice promptly with little or no waiting.
If they would like to estimate the true average time to within 1.9 minute (with 95% confidence) what sample size should they use? (remember to round to the next largest integer.)
Can college conclude that students in new program are significantly different from rest of freshmen class? Use two - tailed test with a = 0.05.
What is the value of the critical value? In the context of this scenario, which of the following is the most appropriate HA
What is the predicted values of the fund in the period t = 1? What is the predicted value of the fund in the period 3, and period 7?
About 10% of all adults deliberately do a one-time fling and feel no guilt about it. In a group of 7 adult friends, what is the probability that: No one has done a one-time fling.
Use a 0.05 significance level to test the claim that these credit rating are from a population with a mean that is equal to 700.
1. Suppose you are testing H0: N(55, 64) vs. H1 N(45, 49), with α = .05. Your test will be one draw x from one of these two populations. What is your critical boundary for x (not the one for the z score of x)? For what values of x would you r..
Consumer Reports published an article on some sport-utility vehicles they had tested recently. They reported some basic information about each of the vehicles and the results of some tests conducted by their staff.
A new product has the following profit projections, associated probabilities, and indifference probability:
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