Explanation Given info: The data represents the measured skulls from different time periods in an attempt to determine whether interbreeding of cultures occurred. Also, the significance level is α = 0.05 . Calculation: State the test hypotheses. Null hypothesis: H 0 : σ 1 = σ 2 Alternative hypothesis: H 1 : σ 1 ≠ σ 2 Test statistic and P-value: Software procedure: Step by step procedure to obtain test statistic and P -value using the MINITAB software: Choose Stat > Basic Statistics > 2 Variance . Under Data , choose Sample standard deviation . In First, enter 30 under Sample size . In First, enter 5.13 under Standard deviation In Second, enter 30 under Sample size . In Second, enter 5.35 under Standard deviation Check Options , enter Confidence level as 95.0 . In Hypothesized ratio StDev 1 / StDev 2 Choose not equal in alternative

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ISBN: 9780321836960

Author: Mario F. Triola

Publisher: PEARSON

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Chapter 9.5, Problem 12BSC

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To test: The claim that the variation of maximal skull breadths in 4000 a.c. is the same as the variation in A.D 150.

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Chapter 9.5, Problem 11BSC

Chapter 9.5, Problem 13BSC

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Chapter 9 Solutions

Elementary Statistics

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To test: The claim that the variation of maximal skull breadths in 4000 a.c. is the same as the variation in A.D 150.

Solution Summary: The author concludes that there is sufficient evidence to support the claim that the variation of maximal skull breadths in 4000 a.c.

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To test: The claim that the variation of maximal skull breadths in 4000 a.c. is the same as the variation in A.D 150.

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Chapter 9 Solutions