In an experiment to assess whether or not regrown feathers on birds are more yellow than original feathers. A regrown (atypical) and original (typical) feather is each harvested from 16 birds, and their yellowness index computed. A t-test was then conducted to a = 0.05 level to assess if there is evidence to conclude that regrown feathers are more yellow, with the results shown below. Lower values are more yellow. t. test (Yellowness Type, WiebeandBortolotti 2002b, conf.level = Welch Two Sample t-test data: Yellowness by Type t = -3.56, df = 29.971, p-value = 0.00063 0.95, alternative = "1") alternative hypothesis: true difference in means between group Atypical and group Typical is less than 0 95 percent confidence interval: -Inf -0.0717478 sample estimates: mean in group Atypical mean in group Typical Cohen's d -.176125 -0.039000 d estimate: -1.258657 (large) 95 percent confidence interval: lower upper -2.0489749 -0.4683385 1. Write the null and alternate hypothesis being tested here. 2. State clearly the conclusion of this hypothesis test. 3. Is this the ideal test to be conducted for this problem? Explain why or why not in 1-2 brief sentences.

In an experiment to assess whether or not regrown feathers on birds are more yellow than original feathers. A regrown (atypical) and original (typical) feather is each harvested from 16 birds, and their yellowness index computed. A t-test was then conducted to a = 0.05 level to assess if there is evidence to conclude that regrown feathers are more yellow, with the results shown below. Lower values are more yellow. t. test (Yellowness Type, WiebeandBortolotti 2002b, conf.level = Welch Two Sample t-test data: Yellowness by Type t = -3.56, df = 29.971, p-value = 0.00063 0.95, alternative = "1") alternative hypothesis: true difference in means between group Atypical and group Typical is less than 0 95 percent confidence interval: -Inf -0.0717478 sample estimates: mean in group Atypical mean in group Typical Cohen's d -.176125 -0.039000 d estimate: -1.258657 (large) 95 percent confidence interval: lower upper -2.0489749 -0.4683385 1. Write the null and alternate hypothesis being tested here. 2. State clearly the conclusion of this hypothesis test. 3. Is this the ideal test to be conducted for this problem? Explain why or why not in 1-2 brief sentences.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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