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1. Why would you not recommend the strategy of testing for equal variances, and if not significant, using the ANOVA F test rather than Welch's method.
2. Five independent groups are compared with n = 15 observations for each group. Fill in the missing values in the following summary table
Source of variation
Degree of freedom
Sum of squares
Mean square
F
Between groups
-
50
Within groups
150
In a recent study, a random sample of children in grades two through four showed a significant negative relationship between the amount of homework assigned and student attitudes. What is the explanatory variable and what is the response variable?
Let x1, ..., xn be a random sample from an exponential distribution, X ~ EXP(theta) a) If x(bar) = 17.9 with n = 50, then find a one-sided lower 95% confidence limit for theta.
question the hughes supply company uses an inventory management method to determine the monthly demands for various
The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting, Inc. during the first quarter of 2004.
The owner of the Burger Doodle Restaurant is considering two ways to expand operations: open a drive-up window or serve breakfast
Is there sufficient statistical evidence at the 10% significance level to conclude that the churn rate in the telecommunications industry exceeds 15%? Perform a hypothesis test for a single proportion and report the findings.
for a certain aptitude test it is known from past experience that the average score is 1000 and the standard deviation
A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours.
As part of a study of corporate employees, the Director of Human Resources for PNC, Inc. wants to compare the distance traveled to work by employees at their office in downtown Cincinnati with the distance for those in downtown Pittsburgh.
(a) Construct a histogram of the drying times of polyurethane from the data in Exercise 115. (b) What can be said about the shape of this histogram?
Using the 0.10 level of significance, is there evidence that the mean shopping time at the local supermarket is greater than the claimed value of 22 minutes?
To avoid losing money, the top 5% (the heaviest 5%) is labeled overweight. A) What proportion of boxes is underweight?
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