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A recent survey compared the monthly incomes of electrical engineers with that of civil engineers. A sample of 13 electrical engineers had an average income of 64K with a sample standard deviation of 5k. A sample of 15 civil engineers had an average income of 69k with a sample standard deviation of 3.9k. At the significance level of .05 can we conclude that there is a difference in the variance of the two types of engineers?
What is the null hypothesis?
What is the critical value of test tastistics
What is the calculated value of the test statistic
What is the decision
The time between the arrival of electronic messages at your computer is exponentially distributed with a mean of four hours. What is the probability that you do not receive a message during a two-hour period?
What is the difference between the null and alternative hypothesis statements in one tailed and two tailed tests? How can manufacturing companies use the standard normal distribution to determine quality control of their products?
in order to accumulate enough money for a down payment on a house a couple deposits 415 per month into an account
Random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants?
A researcher used stepwise regression to create regression models to predict Birth Rate (births per 1,000) using five predictors: Life Exp (life expectancy in years).
What are the assumptions that must be met for non-parametric statistics? What are the positives and the negatives of the chi-square test?
An investment project is expected to earn $100,000 on average with a standard deviation of $50,000. Assume earnings from this investment project is a normal distribution. Of the next 15 people that invest in this project, what is the probability t..
the probability that a certain kind of scratch-off lottery ticket will win a prize is 0.22. kendra received 8 tickets
The use of linear regression is a critical tool for a manager's decision-making ability. Please carefully read the example below and try to answer the questions in terms of the problem context.
according to the internal revenue service the mean tax refund for the year 2013 was 3000. assume the standard deviation
Henry performed a two-tailed test for an experiment in which N = 24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to complete his obt.with this tcv. Is he more likely to make a type I or II err..
Find a 95% confidence interval estimate of the average salary for all chemists at the Dull Chemical Company. Assume that chemists' salaries are normally distributed.
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