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Q1) A sample of 20 pages was taken without replacement from 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, mean area devoted to exhibit ads was measured (a display ad is large block of multicolored illustrations, maps, and text). Data (insquare millimeters) are given below:
0 260 356 403 536 0 268 369 428 536 268 396 469 536 162 338 403 536 536 130
(a) Create a 95% confidence interval for true mean.
(b) Why might normality be issue here?
(c) What sample size would be required to get the error of ±10 square millimeters with 99 percent confidence?
(d) If this is not a sensible requirement, propose one that is.
State the null and alternative hypotheses you would use to test whether the year-end bonuses paid by Jones & Ryan were different from the population mean.
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Test hypothesis that annual incomes of corporate trainers in areas of more than 500,000 are considerably more than those in areas of less than 100,000. Make use of the 5% level of risk.
A scientist examined the effect of temperature and catalyst on the yield of a reaction. He ran the experiment at both 150° and 200°C with two types of catalyst.
Estimate the population mean
The student with the 92 found a grading error on her exam and her correct grade was 95. There were no other grading errors. After correcting this student's paper, the five number summary for the midterm exam will be
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This model is fit to the data using the method of least squares using statistical software, and the following ANOVA table is obtained
Below are one hundred pseudorandom numbers from a uniform pdf. Set up and test the appropriate goodness-of-fit hypothesis. Let α = 0.05.
what percent of the total number of seeds germinated?
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Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study
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