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1. After receiving some complaints from the readers, your cam¬pus newspaper decides to redesign its front page. Two new formats, Band C, were developed and tested against the current format, A. A total of 75 students were randomly selected and 25 students were randomly assigned to each of three format conditions. The students were asked to evaluate the effectiveness of the format on an 11-point scale (1 = poor, 11 = excellent).
a) State the null hypothesis.
b) What statistical test should you use?
c) What are the degrees of freedom associated with the test statistic?
Assuming that the manufacturer's claim is correct, what is the probability the mean of the sample is 37,650 miles or less?
A textile manufacturer estimates that it produces bolts of cloth with flaws following a Poisson distribution that has an average of one flaw per 200 feet of cloth.
Describe the goal of an experimental research study and identify the two elements that are necessary for an experiment to achieve its goal.
What are the best-case and worst-case outcomes the owner may face on this product if she implements your suggestion?
If its weekly cost function is C(x)=68,000+150x, how should the manufacturer set the size of the rebate in order to maximize its profit?
To find out the efficiency of the current ticket operation, Mike wishes to examine several queue operating features.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
A sample of 12 homes sold last week in St Paul, Minnesota, is selected. The results are shown below and create a scatterplot. Insert the trendline into the graph and show the regression equation.
What is the probability that none of the questions in the second set are the same as any of those in the first set? What must the computer do for there to be no questions in common?
The mean noise level of stroke floors in 20 different hospitals was 63.1 dBA, and the standard deviation was 4.1 dBA. The mean noise level for 24 hospital operating rooms was 56.3 dBA and the standard deviation was 7.5 dBA. At α = .05 can it be co..
Is there a significant difference between the lengths of front and rear legs of a certain breed of horses. The results of the measurements in inches made in 10 of these animals are:
Interpret the results. Is it possible that, for these populations of days, the average number of calls completed between plumber A and plumber B do not differ?
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