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Continueing its monitoring of the blackness of the newpaper print, first described in the Chapter 6 Managing the Springville Heraldcase, the production department of the newspaper wants to ensure that the mean blackness of the print for all newspapers is at least 0.97 on a standard scale in which the target value is 1.0. A random sample of 50 newspapers has been selected, and the blackness of each paper has been measured. Using PhStat, calculate the sample statistics and determine whether there is evidence that the mean blackness is less than 0.97. Write a memo to management that summarizes your conclusions.
Probability using Pareto chart - Evaluate the probability of randomly selecting an adult from the sample who doesn't always eat healthy foods because he or she has no time to cook or is confused about nutrition.
Assume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample approximately half the size.
Determine the relationship between pretest scores and final exam scores after controlling for cumulative GPA. Compute SPSS test would you run?
Based on the information provided, which set of variables provided the best predictor of the spring fox population?
The bacteria Escherichia coli are commonly found in the human bladder. Suppose that 3000 of the bacteria are present at time t-0. Then t minutes later, the number of bacteria present can be approximated by:
A sample of 25 concession stand purchases show a mean purchase of $5.29 with a standard deviation of $3.02. However, a later showing of the same movie, a sample of 25 purchases where the mean was $5.12 with a standard deviation of $2.14.
Provide a descriptive statistic (to 1 decimal) that could be used to estimate the number of women out of 1000 in this population who have tissue abnormalities.
Evaluate a simple aggregate price index for 2004. Use 2000 as the base period - Estimating the simple aggregate price index.
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
A sample of 100 widgets from the Acme production line shows that the average lifespan of these parts is 900 hours. The standard deviation of production has been 200 hours historically and is known to be normally distributed.
Discuss which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc te..
In the past, of all the students enrolled in "Basic Business Statistics" 10% earned A's 20% earned B's, 30% earned C's, 20% earned D's and the rest either failed or withdrew from the course.
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