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Chi-square test for independence of attributes.
An investment portfolio manager categorized her investors as having moderate, medium or high incomes, based on their records. She then rates their overall degree of investment risk from an analysis of the profile of their investments. Counts for investor income and investment risk for 1094 randomly selected investors from one of her investment funds are given in Table 1. She is interested to see if a relationship exists between declared income level and degree of investment risk.
(i) Explain why a x2 test of the resulting contingency table is appropriate for such an investigation.
(ii) Under take a suitable x2 test to establish if there is any evidence, at the 5% significance level, that investment risk depends on level of income.
From a random sample of 48 days in a recent year, U.S. gasoline prices had a mean of $2.34 (wow - that's old data!) and a standard deviation of $0.32. Construct the 90% and 95% confidence intervals for the population mean.
A location along a 500 foot assembly line from which to observe the work habits of the workers on the line. What is the probability that the point she selects: is within 25 feet of the end of the line.
Fully charge a 0.330 mF and a 0.650 mF capacitor when they are placed in parallel? How much charge flowed from the battery when the capacitors are placed in series?
Find out whether palliative care improves the mental health of people with advanced HIV.
Mean score on 10 item test for all students enrolled in a Traditional course was 9.64. A random sample of 41 students in Project Course is given same test
At α = .05, is there a difference in variances? Illustrate all steps clearly, including the illustration of the decision rule.
Setup the alternative hypothesis that will test the claim that the percentage of women preferring white wine is 25% higher than men.
Which of the following statements is consistent with the scatterplot
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
Suppose a simple random sample of size 57 is selected from a population with = 11. Find the value of the standard error of the mean in each of the following cases. The population size is infinite.
Determination of Nominal, Ordinal, Interval, Ratio.Temperature is an example of what level of measurement.
A project manager at COMSOFT corporation has collected statistics on the organization's software development process. He has the size of each project in number of lines of code for the past 20 projects and the number of lines of code in error disc..
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