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The HR manager of a water-bottling company wants to estimate the proportion of employees that are pleased with the cleanliness of the bathrooms. She considers two methods of obtaining a sample of 550 employees from the 3,500 employees at the company.
Part A: To make the process easier, the manager considers surveying the first 550 employees who enter a company's annual conference center. Identify the type of sampling method proposed and discuss why this sampling method might be biased.
Part B: The second method the HR manager is contemplating involves a stratified random sample of 550 employees. The company has two campuses with male and female employees at each campus. What circumstances would stratification by campus give a more precise approximation of the proportion of employees who are satisfied with the cleanliness of the bathrooms than stratification by gender?
Consider a situation involving a server, e.g., a cashier at a fast-food restaurant, an automatic bank teller machine, a telephone exchange, etc.
A 2007 study reported in Science magazine stated that fifth-grade teachers scored a mean of 3.4 (out of 7) points for "providing evaluative feedback to students on their work." Assume that the sample size was 36 and the sample standard deviation w..
In tests of a speed-reading course, it is found that 10 subjects increased their reading speed by an average of 200 words per minute, with a standard deviation of 75 words. At the 0.10 level, does this sample information suggest that the cours..
Differentiate between mean, median, and mode. Interpret distribution shapes, especially with respect to skewness and outliers.
What is the motivation behind constructing multivariate control charts? What advantages do they have over control charts for individual characteristics?
a sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a
Assume each newborn baby has a probability of approximately 0.53of being female and 0.47of being male. For a family with four children, let X equals=number of children who are girls. a. Identify the three conditions that must be satisfied for X to..
Assess how these classifications can be useful today to someone analyzing current government structures.
two marbles are chosen at random from a box that contains 5 red and 5 blue balls. if the balls are the same color you
Write a 1500-word paper, discussing the role of art in America since the Gilded Age. Include discussion of the following:
The level of calcium in the blood in healthy young adults varies with mean about 9.5 milligrams per deciliter and standard deviation about σ = 0.4. A clinic in rural Guatemala measures the blood calcium level of 160 healthy pregnant women at their..
Show that the beta distribution becomes the uniform distribution over the unit interval when ß1 = ß2 = 1.
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