The Analysis of Biological Data
2nd Edition
ISBN: 9781936221486
Author: Michael C. Whitlock, Dolph Schluter
Publisher: W. H. Freeman
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Chapter 6, Problem 23AP
a)
To determine
To explain the one tailed or two tailed would be more appropriate for the given test.
b)
To determine
To state the hypothesis statement when the two tailed hypothesis test is being used.
c)
To determine
To calculate the P value for the two tailed tests.
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A researcher administers a treatment to a sample from a population with a mean of m=50. If the treatment is expected to increase scores and a one-tailed test is used to evaluate the treatment effect, the the null hypothesis states that m=40. True or false?
Also, using α = .05, run a two-tail t-test for one sample to test Ho: µ=283 for the 2009 scores. Report the t-obt, df, and p-values.
Would you reject the null hypothesis that the 2009 scores come from a population with average 283? If this is the case, does it come from a population from larger or smaller average?
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.
Would you reject the null hypothesis that the 2019 scores come from a population with average 283? If this is the case, does it come from a population from larger or smaller average?
Chapter 6 Solutions
The Analysis of Biological Data
Ch. 6 - Prob. 1PPCh. 6 - Prob. 2PPCh. 6 - Prob. 3PPCh. 6 - Prob. 4PPCh. 6 - Prob. 5PPCh. 6 - Prob. 6PPCh. 6 - Prob. 7PPCh. 6 - Prob. 8PPCh. 6 - Prob. 9PPCh. 6 - Prob. 10PP
Ch. 6 - Prob. 11PPCh. 6 - Prob. 12PPCh. 6 - Prob. 13PPCh. 6 - Prob. 14PPCh. 6 - Prob. 15APCh. 6 - Prob. 16APCh. 6 - Prob. 17APCh. 6 - Prob. 18APCh. 6 - Prob. 19APCh. 6 - Prob. 20APCh. 6 - Prob. 21APCh. 6 - Prob. 22APCh. 6 - Prob. 23APCh. 6 - Prob. 24APCh. 6 - Prob. 25APCh. 6 - Prob. 26APCh. 6 - Prob. 27APCh. 6 - Prob. 28APCh. 6 - Prob. 29APCh. 6 - Prob. 30AP
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- A researcher first decided to conduct a two-tailed hypothesis test, with alpha = .05, but then decided she wants to reduce the risk of a Type I error. What should she do? a. Calculate her statistics more carefully. b. Decrease alpha to .01 c. Increase alpha to .15 e. Conduct a three-tailed testarrow_forward3. A researcher is testing a two-tailed null hypothesis at the p < .01 level with df = 45. What critical value would she or he use? Justify your answerarrow_forwardA researcher did a one-tailed one-sample t-test to test the hypothesis that babies prefer the color blue over the color red. He collected a sample of 26 babies and presented them with a red plastic star and a blue plastic start for 12 seconds. The researcher measured the amount of time each baby spent watching the blue star out of the 12 seconds. What is µ based on the null hypothesis?arrow_forward
- A researcher administers a treatment to a sample from a population with a mean of µ=60. If the treatment is expected to increase scores and a one-tailed test is used to evaluate the treatment effect, then the alternative hypothesis would state that u> 60. A. true B. falsearrow_forwardYou conduct a two tailed hypothesis test and get a test statistic of z=1.17 and a pvalue of .2420. If your test had been a left tailed test what would the p value have been in that casearrow_forwardA high school is proud of its advanced chemistry class, in which its 16 students scored an average of 89.3 on the statewide exam, with s = 9. Test the same hypothesis at the .01 level (two-tailed), considering your decision with respect to the null hypothesis, what type of error (Type I or Type II) could you be making?arrow_forward
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