Questions from Statistics


Q: In an ANOVA test for equality of mean skull breadths of Egyptian

In an ANOVA test for equality of mean skull breadths of Egyptian males from three different epochs, the P-value of 0.0031 is obtained. We conclude that the mean skull breadths from the three different...

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Q: In an ANOVA test for equality of mean IQ scores of students

In an ANOVA test for equality of mean IQ scores of students majoring in history, psychology, and art, the P-value of 0.242 is obtained. Based on the P-value, we cannot support the alternative hypothes...

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Q: The Atkins, Zone, Weight Watchers, and Ornish diets were

The Atkins, Zone, Weight Watchers, and Ornish diets were tested in clinical trials. For each participant in the trials, the amount of weight loss was recorded, and results from analysis of variance sh...

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Q: An economist wants to compare the mean annual income of government employees

An economist wants to compare the mean annual income of government employees in four different states. Analysis of variance cannot be used because there are more than three populations.

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Q: Samples of airline departure times are obtained and compared to the scheduled

Samples of airline departure times are obtained and compared to the scheduled departure times. Five major airlines are compared and their mean delay times are recorded. Identify the null and alternati...

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Q: A researcher obtains random samples of SAT scores from students at three

A researcher obtains random samples of SAT scores from students at three different colleges. She plans to use the three sets of sample data with the method of analysis of variance. Identify the null a...

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Q: Samples of Flesch-Kincaid Grade Level readability scores are obtained for

Samples of Flesch-Kincaid Grade Level readability scores are obtained for randomly selected pages from books by Tom Clancy, J. K. Rowling, and Leo Tolstoy. The analysis of variance results from STATDI...

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Q: The Vertical Semirestrained Test was used to conduct flammability tests on children’s

The Vertical Semirestrained Test was used to conduct flammability tests on children’s sleepwear. Pieces of fabric were burned under controlled conditions. After the burning stopped,...

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Q: A random sample of M&Ms is partitioned into six categories

A random sample of M&Ms is partitioned into six categories according to color. The weights (in grams) are obtained, and the analysis of variance results are as shown in the display in Figure 10.5....

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Q: A random sample of adult females is partitioned into the age categories

A random sample of adult females is partitioned into the age categories 18–24, 25–50, and over 50. The pulse rates of the subjects in the three different age catego...

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