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Count of their Kleenex use in diaries According to the Wall street journal report, the survey results left "little doubt that the company should put 60 tissues in each box." The number 60 was "the average number of times people blow their nose during a cold." (note: in 2000, the company increased the number of tissues packaged in a cold-care box to 70.)
From summary information provided in the wall street journal article, we constructed a data set that represents the results of a survey similar to the one described above. In the data file name Tissue, We recorded the number of tissues used by each of 250 consumers during a period when they had cold. We apply the hypothesis testing methodlogy presented in this chapter to this data set in several Statistics in Action Revisited example.
What are the hypotheses we would want to test for the Kleenex case?
A vertical line is drawn through a normal distribution at z = -0.25, and separates the distribution into two sections. What proportion of the distribution is in the larger section?
Determine the value of population mean? What is the best evaluate of this value?
The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture.
The branch manager of a pet supply store wants to study characteristics of customers of his store. In particular, he decides to focus on two variables
You decide to predict gasoline prices in different cities and towns in the U.S. for your term project. Your dependent variable is price of gasoline per gallon and your explanatory variables are per capita income
Calculate expected number of interruptions per day. Calculate standard deviation.
When would you use ANOVA at your place of employment, in your education, or in politics? Please share the WORDS that would lead you to the null hypothesis for a specific and simple example
In part b, the sample have greater variability than part a, but the sample sizes are unchanged. how does the larger variability affect the size of the standard error for the sample mean?
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
Assume duration of human pregnancies follow mound-shaped distribution with mean of 266 days and the standard deviation of 16 days.
A student with a 3.5 to 4 grade point average who took standardized test is randomly selected. Determine the probability that students test score is less than 36.
Suppose n progeny are to be examined, and let P^ be the sample proportion of purple-owered plants. It might happen, by chance, P^ that would be closer to 1/2 than to 9/16. Find the probability that this misleading event would occur if:
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