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Consider the following summary data on the modulus of elasticity (×10^6 psi) for lumber of three different grades [in close agreement with values in the article "Bending Strength and Stffness of Second-Growth Douglas-Fir Dimension Lumber" (Forest Products J., 1991: 35-43), except that the sample sizes there were larger]:
Grade J xi si
1 10 1.63 .27
2 10 1.56 .24
3 10 1.42 .26
Use this data and a significance level of .01 to test the null hypothesis of no difference in mean modulus of elasticity for the three grades
a company wishes to set control limits for monitoring the direct labour time to produce an important product. over
using the company records for the past 500 working days the manager of a car dealership has summarised the number of
Perform exploratory data analysis on CreativityPre and CreativityPost. Using SPSS, calculate the mean and standard deviation of these two variables.
How do we use a least squares regression line? What is the range for the coefficient of determination?
Use the list of random digits below to assign 4 men and 2 women to the shark fin treatment. Read the table from left to right, first selecting the 4 men and then the 2 women. Use the numerical labels given in the chart to the names.
A sample of 49 repairs showed an average overhaul of 285 hours with a standard deviation of 50 hours. Calculate a 95% confidence interval for the average overhaul.
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
Determine the mean, median, and range for each of two data sets. b. Determine standard deviation using rule of thumb for each of data sets.
The following show the hours of sleep on weeknights for a sample of individuals age 49 and younger and for a sample of individuals age 50 and older.
You can allow the cup to overfill 4% of the time. What amount should you set as the mean amount of coffee to be dispensed?
a study involving ten people wants to compare the effectiveness of two different brands of antihistamines with regard
Carry out an ANOVA and describe in detail in a BPS-formatted Results section:
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