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It was claimed that the average annual expenditures per consumer unit had continued to rise, as measured by the Consumer Price Index annual averages (Bureau of Labor Statistics report, 1995). To test this claim, 100 consumer units were randomly selected in 1995 and found to have an average annual expenditure of $32,277 with a standard deviation of $1200. Assuming that the average annual expenditure of all consumer units was $30,692 in 1994, test at the 5% signi?cance level whether the annual expenditure per consumer unit had really increased from 1994 to 1995.
Suppose we have the following information from a simple regression: What is the coefficient of determination? What is the correlation coefficient?
A sample of 25 diff. payroll dept found that the employees worked an average of 310.3 days with a std dev. of 23.8 days. what is the 90% confidence interval for the average days worked.
determine the values of c so that the following function represent joint probability distributions of the random
generate a chart or table that lists a variety of crimes types. your chart should include at least four types of crimes
In relative frequency histogram for a large set of GPAs, the mean and the standard deviation are 2.10 and 0.21 respectively. What proportion of GPAs falls within 1.68 and 2.52?
Out of 1000 people surveyed, 600 belonged to urban areas and rest to rural areas. Among 500 who visited other states , 400 belonged to urban areas. Test 5 % level of significance whether area and visiting other state are dependent.
During a professor's office hours, students arrive, on average, every ten minutes. Assume that the distribution of the time between arrivals follows an exponential distribution. Suppose that a student has just left.
conduct a z-test to determine whether the following two samples indicate that the population proportions are
firms with a reputation for ethical behavior in strategic alliances are likely to have more opportunities to form
In regression analysis, the residuals represent
If the weight distribution is known to be normally distributed, do the data support the veterinarian's suspicion? Conduct a hypothesis test at the 5% significance level. Define your parameter (μ), state your hypotheses, conduct the test and write ..
a the bivariate probability density function for x and y denoted by fx y. let fx y equal x y for 0 lt equal to x lt
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