Denise runs a dependent samples t-test and calculates r2subjects=.46 and r2condition=.23. b) If SStotal= 100, what is the SSerror? c) Which effect size(s) reflects the explained variance due to her experimental manipulation? r2error r2condition both r2subjects and r2condition r2subjects

Denise runs a dependent samples t-test and calculates r2subjects=.46 and r2condition=.23. b) If SStotal= 100, what is the SSerror? c) Which effect size(s) reflects the explained variance due to her experimental manipulation? r2error r2condition both r2subjects and r2condition r2subjects

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A transect is an archaeological study area that is 1/5 mile wide and 1 mile long. A site in a transect is the location of a significant archaeological find. Let x represent the number of sites per transect. In a section of Chaco Canyon, a large number of transects showed that x has a population variance σ2 = 42.3. In a different section of Chaco Canyon, a random sample of 25 transects gave a sample variance s2 = 45.7 for the number of sites per transect. Use a 5% level of significance to test the claim that the variance in the new section is greater than 42.3. (b) Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.)
A behavioral researcher measures the stress response of mice exposed to scary animal pictures (cat, dog, lion, Cheshire cat) with a GABA sensor implanted in the brain. He uses randomly assigned 40 mice, 10 in each group. The researcher records the amount of stress after 30 seconds assuming that there is no difference in the response in whatever way the mouse is scared. The data is normally distributed. Means and variances are provided in the table below. Is there a difference in the response to scary animals. Group 1 - Cat n₁=10 m₁ = 10 s² 1= 1.8 Group 2 - Dog n2=10 m₂= 5.0 s²2= 3.4 Why is the scare effect so low in group 4? Group 3 - Lion n3=10 m3= 3.4 s²1= 2.5 Group 4 - Chesire Cat n4=10 m4= 2.4 s² 1= 1.6
Suppose we flip three fair coins. Let X = number of Heads.(a) Calculate the variance of X directly by using ONLY the PMF for X and theformula for variance (b) Calculate the variance again, but this time, use some of the tools from thebottom of page 9 (split X into 3 Bernoulli r.v.s).(c) Let Y = three times the Bernoulli r.v. for the first coin. Calculate Var(Y ).(d) Explain why your answer to Part C is different from Parts A and B.
Explain whether homogeneity of variance is satisfied for this analysis, and be clear on how you decided this.
I'm stuck on D because I'm having a hard time with P-value.
A transect is an archaeological study area that is 1/5 mile wide and 1 mile long. A site in a transect is the location of a significant archaeological find. Let x represent the number of sites per transect. In a section of Chaco Canyon, a large number of transects showed that x has a population variance σ2 = 42.3. In a different section of Chaco Canyon, a random sample of 24 transects gave a sample variance s2 = 50.3 for the number of sites per transect. Use a 5% level of significance to test the claim that the variance in the new section is greater than 42.3. Find a 95% confidence interval for the population variance. (a) What is the level of significance? (b) Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.) (C) Find the requested confidence interval for the population variance. (Round your answers to two decimal places.) Interpret the results in the context of the application.
The crop researcher wants to test the effect of three different fertilizer mixtures on crop yield. An experiment was done for 15 different fields for all three fertilizer mixtures. The crop researcher performed ANOVA test (alpha =0.1) on the data, with the output given below (some metrics are missing and need to be calculated by you). Anova: Single Factor SUMMARY Groups Count Sum Average Variance Fertilzer 1 15 1486 99.0666667 198.638095 Fertilzer 2 15 1231 82.0666667 110.92381 Fertilizer 3 15 1377 91.8 274.028571 ANOVA F crit Source of Variation Between Groups SS df MS F P-value 2740.31111 2.43356384 Within Groups 8170.26667 42 Total 10910.5778 44 The F statistics is equal to which is than F critical, thus we the null hypothesis of fail to reject 2.43 less equality of means equal 2.17 more not all means are equal 7.04 reject 44
A transect is an archaeological study area that is 1/5 mile wide and 1 mile long. A site in a transect is the location of a significant archaeological find. Let x represent the number of sites per transect. In a section of Chaco Canyon, a large number of transects showed that x has a population variance σ2 = 42.3. In a different section of Chaco Canyon, a random sample of 19 transects gave a sample variance s2 = 49.3 for the number of sites per transect. Use a 5% level of significance to test the claim that the variance in the new section is greater than 42.3. Find a 95% confidence interval for the population variance. (a) What is the level of significance?State the null and alternate hypotheses. Ho: σ2 = 42.3; H1: σ2 > 42.3Ho: σ2 > 42.3; H1: σ2 = 42.3 Ho: σ2 = 42.3; H1: σ2 < 42.3Ho: σ2 = 42.3; H1: σ2 ≠ 42.3 (b) Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.)What are the degrees of freedom?What assumptions are you making…
A transect is an archaeological study area that is 1/5 mile wide and 1 mile long. A site in a transect is the location of a significant archaeological find. Let x represent the number of sites per transect. In a section of Chaco Canyon, a large number of transects showed that x has a population variance ?2 = 42.3. In a different section of Chaco Canyon, a random sample of 19 transects gave a sample variance s2 = 46.9 for the number of sites per transect. Use a 5% level of significance to test the claim that the variance in the new section is greater than 42.3. Find a 95% confidence interval for the population variance. (b) Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.)- 19.96 What are the degrees of freedom? -18 (c) Find or estimate the P-value of the sample test statistic. P-value > 0.1000.050 < P-value < 0.100 0.025 < P-value < 0.0500.010 < P-value < 0.0250.005 < P-value < 0.010P-value < 0.005…
At a 0.05, test to see if the population variances from which the following samples were drawn are equal. The test statistic is Group 1 n₁ = 21 Group 2 n₂ = 19 $1 = 20 S2 = 18 (A) 1.56 (B) 1.23 (C) 1.26 (D) 1.11
A transect is an archaeological study area that is 1/5 mile wide and 1 mile long. A site in a transect is the location of a significant archaeological find. Let x represent the number of sites per transect. In a section of Chaco Canyon, a large number of transects showed that x has a population variance ?2 = 42.3. In a different section of Chaco Canyon, a random sample of 21 transects gave a sample variance s2 = 49.3 for the number of sites per transect. Use a 5% level of significance to test the claim that the variance in the new section is greater than 42.3................