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A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in square millimeters) are shown below:
0
260
356
403
536
268
369
428
396
469
162
338
130
Construct a 95 percent confidence interval for the true mean.
Answer all of these questions using R Commander. Include all graphs, outputs from R Commander.
Compare value of test statistics F obtained in part(2) with value of t 2 , square of test statistic for testing H 0 : β 1 =0 that was needed in test null hypothesis that true slope is 0. Interpret the results of this test.
Compute an F-statistic for each linear construct and determine its significance.
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
determine if the improvement is of practical significance one should. Crop researchers plant 100 plots with a new variety of corn. The average yield for these plots is x' = 130 bushels per acre
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
What should the cut-off score be for the interviews? (Round to nearest whole number).
Given the following data on hotel check-ins for a 6-month period:
By using the maximax criterion, what decision should be made by the decision maker?
In ANOVA, which of the following is not affected by whether or not the population means are equal?
Report the t-value, whether you accept or reject Ho, and whether the difference was significant in a brief sentence.
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
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