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Use the level and power values for the paired t test and Wilcoxon signed-rank test given in Table 6.18 to answer the following questions.
a. For small sample sizes, n ≤ 20, does the actual level of the t test appear to deviate from the nominal level of a = .05?
b. Which type of deviations from a normal distribution, skewness or heavy-tailedness, appears to have the greater affect on the t test?
c. For small sample sizes, n = 20, does the actual level of the Wilcoxon signed-rank test appear to deviate from the nominal level of a = .05?
d. Which type of deviations from a normal distribution, skewness or heavy-tailedness, appears to have the greater effect on the Wilcoxon signed-rank test?
To determine whether the mean is greater than 16 ounces using large sample test.
The mean number of passengers per flight is 160 with a standard deviation of 20. The aircraft used for the route has 200 seats.
Define probability and explain the three perspectives. Provide an example of each. Describe the difference between subjective and probabilistic sampling methods. What are the advantages and disadvantages of each?
1.to assess the accuracy of a kitchen scale a standard weight known to weigh 1 gram is weighed a total of n times and
400 had college degrees, 100 were single, and 60 were single college graduates. The probability that an employee of the company is married and has a college degree is?
An occupational health study was carried out to evaluate the health status of workers. The response is forced expiratory volume (FEV), a measure of respiratory function
Do you think this is an effective use of a pie chart? Why or why not? Construct a bar chart to show the distribution of deaths by object struck. Is this display more effective than the pie chart in summarizing this data set? Explain.
A valid probability model
She knows that 60% of the minerals have mass less than a certain amount m, and needs to select a random sample of n = 16 specimens for an experiment. With what probability will their average mass be less than the same amount m? (Hint: Calculate th..
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
when making a stem plot how do you round to the nearest hundred when numbers are given in millions. this is question
one of mendels breeding trials came out as follows. make a chi-square test to see whether these data were fudged.type
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