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The XYZ Corporation is interested in possible differences in days worked by salaried employees in three departments in the financial area. A survey of 23 randomly chosen employees reveals the data shown below. Because of the casual sampling methodology in this survey, the sample sizes are unequal. Research question: Are the mean annual attendance rates the same for employees in these three departments? Days Worked
Days Worked Last Year by 23 EmployeesDepartment Days WorkedBudgets(5 workers) 278 260 265 245 258Payables(10 workers) 205 270 220 240 255 217 266 239 240 228Pricing(8 workers) 240 258 233 256 233 242 244 249
Sketch the areas under the standard normal curve over the indicated intervals, and find the specified areas.
State the largest possible domain for the definition of the function. f(x,y) = cube-root(y^2-x)
Place the following set of numbers in ascending order. Determine the maximum and minimum values of the following set of numbers. 36/7,-1,-2/3,-5,26/9
Gerald takes the ACT Assessment mathematics test and scores 27. ACT math scores for 2007 were Normally distributed with mean 21.0 and standard deviation 5.1. What is Eleanor's standardized score?
Based on a simple random sample of one hundred an analyst estimates the average hourly wage earned by workers in a city to be $30 and computes the margin of error to be $5. Can we conclude from this that most workers there earn between $25 and $35..
Consider the case where we have n observations, sampled from a binomial pdf (our parameter estimator can therefore be given by X/n). Assume that the margin of error is 6%.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
Find the midrange for the following group of data items: what is the midrange rounded to the nearest tenth?
ANOVA is a powerful statistical test. How does ANOVA differ from other parametric tests? What are the conditions that must be met to use a one-way ANOVA?
Determine the probability of choosing at random license plate which ends in the even number?
The price of a book depends on the length. Let the random variable C denote the price of a book in dollars. If C = 4 + 0.1*P, what is the expected value of the price of a book?
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
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