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A study was conducted on the annual incomes of corporate trainers in the state of New York, in metropolitan areas of less than 100,000, and in metropolitan areas having a population of over 500,000. Some sample statistics are:
Sample Statistic Population less than 100K Population more than 500K
Sample Size 45 60
Sample Mean $31,290 $31,330
Sample SD $1,060 $1,900
Test the hypothesis that the annual income of corporate trainers in areas of more then 500,000 are significantly more than those in areas of less than 100,000. Use the 5% level of risk.
Which of the following is true regarding ANOVA? a) It is used to test for a difference in medians among three or more populations
What critical value should the company officials use to determine the rejection region?
We suggest that you use the graphical approach to CVP analysis to solve the following problem, but you may use any other method to find the answer.
A portfolio p of consisting 60% of stock X and 40% of stock Y, has a correlation ρpM = 0.62 with the market. What is the portfolio volatility? Statement on the diversification effect.
The standard deviation of the differences d for the paired sample data s d = ____________
a) Compute a 95% Confidence Interval for the true population proportion of successes. b) Based on this analysis can you conclude that the new system meets the requirement? Explain your conclusion.
An EMT Service keeps records of emergency calls. A study of 150 five-minute time intervals resulted in the distribution of number of calls as follows.
Can students save money by buying their textbooks at Amazon.com? To investigate this possibility, a random sample of 15 textbooks used during the Spring 2007 semester at Iowa State was selected.
Calculate the test statistic. Determine the p-value of the test-statistic.
Give an example of a null and alternative hypotheses. This can be a personal item or something at work. Additionally, identify the Type I and Type II Errors that could occur with your decision-making process.
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
The net profit of an investment is normally distributed with a mean of $10,000 and a standard deviation of $5,000. The probability that the investor's net profit will be between $12,000 and $15,000 is _____________.
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