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Through separate calculations, verify the confidence interval for each of the factor-level means shown in the output for given Exercise.
Exercise An experiment has been conducted to examine main and interactive effects of factor A (keyboard configuration, 3 levels) and factor B (word processing package, 2 levels).
Each cell consists of two replications, representing the number of minutes each of two secretaries randomly assigned to that cell required to type a standard document. Interpret the accompanying computer output for this study, including your conclusion (use the 0.05 level) for each null hypothesis associated with the experiment.
let x have a poisson distribution with mean m. show that the most likely value for x to assume is m with the following
The .95 confidence interval for the difference between the means, using Student's t, is (2.2, 20.5). What are the practical concerns with this confidence interval?
Find the rank or Spearman correlation coefficient between the midterm grade and the IQ ranking of a random sample of 10 students in a large class.
At the first tri-city meeting, there were 8 people from town A, 7 people from town B, and 5 people from town C. If the council consists of 5 people,
Compute the mean and variance of the following discrete probability distribution. A cola-dispensing machine is set to dispense on average 7.00 ounces of cola per cup. The standard deviation is 0.10 ounces. The distribution of amounts dispensed foll..
Find the mean, median, and mode(s) of the observations in problem 2.- Find the lower, middle, and upper quartiles of this data set. Also find the 10th, 15th, and 65th percentiles. What is the interquartile range?
a study on the manufacturer's claim for the demand of the toy colors
Using a three month moving average, what would the forecast and MAD have been for July? Which forecasting method would you recommend? Why?
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
support requests arrive at a software company at the rate of 1 every 20 minutes. assume that the requests arrive as
Use the Welch t -tools to find a two-sided p-value and confidence inter- val for the effect of treatment on lifetimes of guinea pigs in Chapter 2, Exercise 11. Does the additive treatment effect seem like a sensible model for these data?
a. For each age group, pick the midpoint of the interval for the x value. (For the 80+ group, use 85.) b. Using ages as the independent variable and Number of driver deaths per 100,000 as the dependent variable, make a scatter plot of the data.
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