STATISTICS F/BUS.+ECON.-18WK. MYSTATLAB
13th Edition
ISBN: 9780135901526
Author: MCCLAVE
Publisher: PEARSON
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Textbook Question
Chapter 8.2, Problem 8.9LM
Independent random samples of n1 = 233 and n2 = 312 are selected from two populations and used to test the hypothesis H0 : (μ1 – μ2) = 0 against the alternative H0 : (μ1 – μ2) ≠ 0 .
- a. The two-tailed p-value of the test is .1150. Interpret this result.
- b. If the alternative hypothesis had been Ha : (μ1 – μ2) = 0 , how would the p-value change? Interpret the p-value for this one-tailed test
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The NAEP considers that a national average of 283 is an acceptable performance. Using α = .05, run a two-tail t-test for one sample to test Ho: µ=283 for the 2019 scores. Report the t-obt, df, and p-values.
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1. If the sample variance is s^2=32, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha=.05? (show work please, and state both experimental and statistical hypotheses, and state your decision regarding the H0. (all 4 steps of hypothesis test)
2a. If the sample variance is s^2=72, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha=.05? (please show your work and state your decision regarding the H0.)
2b. Calculate Effect size by using r^2 (percentage of variance explained) and state the meaning of effect size.
Chapter 8 Solutions
STATISTICS F/BUS.+ECON.-18WK. MYSTATLAB
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