Please answer T/F with the best reasoning: Post-hoc tests are always run after an ANOVA has been performed to assess significance between specific groups. False, they are run conditionally: only if ANOVA produces significance False, there is no need to run pairwise t tests after an ANOVA has been performed True, these increase the power of the results True, these are also known as pairwise t tests

Answered: Please answer T/F with the best…

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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Suppose a hypothesis test was performed with a level of significance of 0.05. Then if the null hypothesis is actually true, then there is a 5% chance that the researcher will end up rejecting the null hypothesis in error. True False
Assume that matched pairs of data from a poll of Internet users who were asked if they make travel plans through the Internet result in 304 positive signs, 278 negative signs, and 35 ties when the value of the secon variable is subtracted from the corresponding value of the first variable. Use the sign test with a 0.05 significance level to test the null hypothesis of no difference. Let ₁ denote the median of the first variable and 12 denote the median of the second variable. What are the null and alternative hypotheses? O A. Ho: 1₁2 112 H₁:1₁ <1₂ OC. Ho: 11₁ 112 H₁: 1₁ <12 O B. Ho: 11 #11₂ H₁:1₁ =1₂ O D. Ho: 111 112 H₁:1₁ #1₂ Find the test statistic. Test statistic = Find the P-value. P-value= (Round to four decimal places as needed.) Does the null hypothesis of no difference hold? (Round to two decimal places as needed.) O A. Since the P-value is less than the significance level, reject the null hypothesis of no difference. O B. Since the P-value is greater than the significance…
It has been argued that first-born children will in general be more independent than later-born children. Assume a 25-point scale of independence was appraised by 25 firstborn grown-ups and their second-born siblings. The information on independence are as follows (a higher score implies that the individual is more independent)Is the argument valid? Use a 0.01 level of significance and Wilcoxon Signed Ranks Test to analyze the data.
П. STA requires each student to train a rat to perform specific behaviors. Student grades are determined by the rats' performance. Mr. Simmons is concerned that students who have prior experience with training rats or other animals may have an advantage. To test the hypothesis, she gave each student a survey at the start of the class. The survey asked students about their previous animal related experiences. At the course's conclusion, she compared the rats' learning for students with prior animal experience to students without. Do the data suggest a significant difference between the two groups of students? Rat scores for students with animal Rat scores for students with no experience experience n = 15 М-66 n = 10 M= 78 SS = 1420 SS = 2030 State the hypotheses, critical values with df and alpha = .05, calculate the test statistic and show all your work for each step of the calculations, answer the question stated above in bold-italics, AND state your conclusion using the 3-sentence…
Researchers were interested in assessing whether stress levels are different at the beginning of the semester compared to finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week. Participant Stress 1 Stress 2 Difference Score (Di) (Di - Mdiff)2 1 22 22 0 2 32 34 -2 3 24 25 -1 4 28 30 -2 5 26 29 -3 What is the observed test statistic (i.e., tobs)? Round to 2 decimal places.
Please help it’s not graded
Assume that matched pairs of data from a poll of Internet users who were asked if they make travel plans through the Internet result in 373 positive signs, 333 negative signs, and 22 ties when the value of the second variable is subtracted from the corresponding value of the first variable. Use the sign test with a 0.10 significance level to test the null hypothesis of no difference. Let ₁ denote the median of the first variable and 12 denote the median of the second variable. Wha are the null and alternative hypotheses? A. Ho: 1₁ #1₂ H₁:1₁ =11₂ C. Ho: 1₁ =1₂ H₁:1₁ <1₂ Find the test statistic. Test statistic = needed.) OB. Ho: 1₁ 2112 H₁:1₁ <1₂ D. Ho: 1₁ =112 H₁:1₁ #1₂ (Round to two decimal places as
Already did the questions that I understood but I need help with question b and question C. Thanks so much!
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As apart of a study into healthy lifestyles, Marry recorded a person's position in the university and how frequently they ate a salad. The results are shown in the table Jean conducted a x^2 test for independence at a 5% significance level. State the hypothesis and state, giving a reason, whether the null hypothesis should be accepted or rejected and in context of the problem.
A local chess club claims that the length of time to play a game has a mean of 23 minutes or more. Write sentences describing type I and type II errors for a hypothesis test of this claim. A type I error will occur if the actual mean of the length of time to play a game is ▼ less than equal to less than or equal to greater than not equal to greater than or equal to 23 minutes, but you ▼ fail to reject reject the null hypothesis, ▼ Upper H 0 : mu less than 23H0: μ<23 Upper H 0 : mu equals 23H0: μ=23 Upper H 0 : mu not equals 23H0: μ≠23 Upper H 0 : mu less than or equals 23H0: μ≤23 Upper H 0 : mu greater than or equals 23H0: μ≥23 Upper H 0 : mu greater than 23H0: μ>23 . A type II error will occur if the actual mean of the length of time to play a game is ▼ not equal to greater than or equal to equal to greater than less than or equal to less than 23 minutes, but you ▼ fail to reject reject the null hypothesis, ▼…

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		False, they are run conditionally: only if ANOVA produces significance
		False, there is no need to run pairwise t tests after an ANOVA has been performed
		True, these increase the power of the results
		True, these are also known as pairwise t tests