Questions from Essentials of Statistics


Q: One of the larger species of tarantulas is the Grammostola mollicoma,

One of the larger species of tarantulas is the Grammostola mollicoma, whose common name is the Brazilian giant tawny red. A tarantula has two body parts. The anterior part of the body is covered above...

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Q: G. Wittemeyer et al. studied demographic data on African elephants

G. Wittemeyer et al. studied demographic data on African elephants living in Kenya in the article “Comparative Demography of an At-Risk African Elephant Population” (PLOS ONE, Vol. 8. No. 1). Based on...

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Q: A preliminary behavioral study of the Jingdong black gibbon, a primate

A preliminary behavioral study of the Jingdong black gibbon, a primate endemic to the Wuliang Mountains in China, found that the mean song bout duration in the wet season is 12.59 minutes with a stand...

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Q: In the article “Assessing Friendship Motivation During Preadolescence and Early Adolescence

In the article “Assessing Friendship Motivation During Preadolescence and Early Adolescence” (Journal of Early Adolescence, Vol. 25, No. 3, pp. 367–385), J. Richard and B. Schneider described the prop...

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Q: In 1905, R. Pearl published the article “Bio metrical

In 1905, R. Pearl published the article “Bio metrical Studies on Man. I. Variation and Correlation in Brain Weight” (Biometrika, Vol. 4, pp. 13–104). According to the study, brain weights of Swedish m...

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Q: The A. C. Nielsen Company reported in the Nielsen Report

The A. C. Nielsen Company reported in the Nielsen Report on Television that the mean weekly television viewing time for children aged 2–6 years is 24.85 hours. Assume that the weekly television viewin...

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Q: Refer to Example. The heights of the 3264 female students attending

Refer to Example. The heights of the 3264 female students attending midwestern college are approximately normally distributed with mean 64.4 inches and standard deviation 2.4 inches. Thus, we can use...

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Q: Research reveals that foot length of women is normally distributed with mean

Research reveals that foot length of women is normally distributed with mean 9.58 inches and standard deviation 0.51 inch. This distribution is useful to shoe manufacturers, shoe stores, and related m...

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Q: Researchers S. Lesik and M. Mitchell explore the difficulty of

Researchers S. Lesik and M. Mitchell explore the difficulty of predicting success in college-level mathematics in the article “The Investigation of Multiple Paths to Success in College-Level Mathemati...

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Q: Assume that the variable under consideration has a density curve. Note

Assume that the variable under consideration has a density curve. Note that the answers required here may be only approximately correct. Given that 28.4% of all possible observations of the variable a...

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