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An English teacher has been teaching a sixth grade composition class for many years. He has the feeling that over the past several years, the writing ability of students has changed. A national test of proficiency in composition was administered 5 years ago. The resulting distribution of scores was normally shaped, had a mean of 85 and a standard deviation of 10.9. In order to test his feeling, he gives his present class of 43 students the same proficiency test. The resulting mean is 80 and the standard deviation is 8.7. The obtained value of the appropriate statistic for testing H0 is
zobt = -0.46
zobt = +3.01
zobt = -3.01
zobt = -0.45
Descriptive statistics for given data - Evaluate the range, variance, and standard deviation of the data set. Interpret the results in the context of the real-life setting.
Currently, quarters have weights that are normally distributed with a mean of 5.670 g and a standard deviation of 0.062 g. A vending machine is configured to accept only those quarters with weights between 5.550 g and 5.790 g.
Describe a where you might want to use a dummy variable in a multiple regression. What would the dummy variable buy you in that situation?
The following table shows the hardness (in Brinell hardness numbers) and the tensile strength (in thousands of pounds per square inch) of ten specimens of a certain alloy.
Which of the following is true regarding ANOVA? a) It is used to test for a difference in medians among three or more populations
you need to estimate the mean number of travel days per year for outside salespeople. the mean of a small pilot study
Canadians found that 58% were satisfied with the service provided by the dealer from which they bought their car. The sampling variability associated with these statistics is?
suppose that 40 percent of the voters in a particular region support a candidate. find the probability that a sample of
Explain what is meant by subjective probability. Research the Internet, and provide a business-related example in which subjective probability assessment would likely be used (be sure to cite your sources).
a six-sigma black belt quality engineer found that in a random sampl of 140 printed circuit boards 18 are defective due
Calculate the test statistic (z-score) for the sample. What deccision should be made about the null hypothesis, and what decision should be made about the effect of the program.
In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 significance level, test the claim that the failure rate is now lower if a simple random sample of 1520 current job applicants results in 58 failures. Does the ..
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