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Your local newspaper contains a large number of advertisements for unfurnished one-bedroom apartments. You choose 10 at random and calculate that their mean monthly rent is $540 and that the standard deviation of their rents is $80. (a) What is the standard error of the mean? (b) What are the degrees of freedom for a one-sample t statistic?
A retail federation conducted a nationwide survey of 1000 adults last October and found that approximately 55% of the respondents planned to do some type of Halloween decorating.
The population variances are 4.6 and 5.0 respectively. Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades?
Suppose that the critical region for a certain test of hypothesis is of the form T greater than or equal to 2.5 and the computed value of T from the data is -2.75.
Solar cells are attached to a panel with a new heat resistant adhesive. The adhesive must provide 2.80 pounds of force in order to hold the cell on the panel. A random sample of 50 cells is tested and the following forces are necessary to break th..
The manufacturer of the ColorSmart-5000 television set claims that 95 percent of its sets last at least five years without needing a single repair.
One of 4 bus drivers is also arbitarily chosen. Let Y denote number of students on his bus. Calculate expectations and variances of X and Y.
In a shipment of 56 vials, only 13 do not have hairline cracks. If you randomly select one vial from the shipment, what is the probability that it has a hairline crack?
Regression equation to predict the dependent variable using multiple regression analysis:
What is the probability of winning if the rules are changed so that in addition to selecting the correct five numbers, you must now select them in the same order they are drawn?
What differentiates a z test statistic for a population from the z statistic for a sampling of means? Why is there a difference? Consider a normal population with ? = 43 and ? = 5.2. Calculate the z-score for an x ? of 46.5 from a sample of size 16.
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
Describe the similarities between an F-ratio and a t statistic. The basic relationship between t statistic and F-ratios can be stated in an equation. What is that equation?
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