When we test Ho: μ = 0 against H₂: μ>0, we get a P-value of 0.08. a. What would the decision be for a significance level of 0.01? Interpret in context. b. If the decision in (a) is in error, what type of error is it? c. Suppose the significance level were instead 0.10. What decision would you make, and if it is in error, what type of error is it? a. What would the decision be for a significance level of 0.01? A. We would decide to reject the null hypothesis. We would have sufficient evidence that the population mean is different from 0. B. We would decide not to reject the null hypothesis. We would not have sufficient evidence that the population mean is different from 0. C. We would decide not to reject the null hypothesis. We would have sufficient evidence that the population mean is different from 0. D. We would decide to reject the null hypothesis. We would not have sufficient evidence that the population mean is different from 0.

When we test Ho: μ = 0 against H₂: μ>0, we get a P-value of 0.08. a. What would the decision be for a significance level of 0.01? Interpret in context. b. If the decision in (a) is in error, what type of error is it? c. Suppose the significance level were instead 0.10. What decision would you make, and if it is in error, what type of error is it? a. What would the decision be for a significance level of 0.01? A. We would decide to reject the null hypothesis. We would have sufficient evidence that the population mean is different from 0. B. We would decide not to reject the null hypothesis. We would not have sufficient evidence that the population mean is different from 0. C. We would decide not to reject the null hypothesis. We would have sufficient evidence that the population mean is different from 0. D. We would decide to reject the null hypothesis. We would not have sufficient evidence that the population mean is different from 0.

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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You wish to test the following daim (Ha) at a significance level of a = 0.001. H.:P1 2 P2 Ha:P1 < P2 You obtain a sample from the first population with 244 successes and 117 failures. You obtain a sample from the second population with 523 successes and 202 failures. test statistic = [three decimal accuracy] p-value = [four decimal accuracy) The p-value is... O less than (or equal to) a O greater than a This test statistic leads to a decision to... O reject the null hypothesis O fail to reject the null hypothesis As such, the final condusion is that... O There is sufficient evidence to support that the first population proportion is less than the second population proportion. There is not sufficient evidence to support that the first population proportion is less than the second population proportion.
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44
Express the alternative hypothesis in symbolic form. A psychologist claims that the mean amount of time (in hours) that females spend in talk therapy is more than that of men. Assume that two samples are independent. Let the female talk therapy times be the first population and the male talk therapy times be the second population.
Justin wants to know whether a commonly prescribed drug does improve the attention span of students with attention deficit disorder (ADD). He knows that the mean attention span for students with ADD who are not taking the drug is 2.3 minutes long. His sample of 12 students taking the drug yielded a mean of 4.6 minutes. Justin can find no information regarding σx , so he calculated s2x =1.96. a. Identify the independent and dependent variables. b. In a sentence, state the null hypothesis being tested. c. Using symbols, state the null and alternative hypotheses. d. Determine the critical region using a one-tailed test with alpha = .05. e .Conduct the hypothesis test (Do the math and compare the t-critical and t-obtained values). f. State your conclusions in terms of H0 (Should you reject the H0 or fail to reject/accept the H0). g. Based on your analysis, is there a relationship between the drug and attention span?
2. (MMC 6.43). The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude toward school, and study habits of students. Each score ranges from 0 to 200. The mean attitude score for U.S. college students is about 110, and the standard deviation is about 25. A teacher who suspects that older students have better attitudes toward school gives the SSHA to 25 students who are at least 30 years of age. Their mean score is = 118.3. a. Assuming that o = 25 for the population of older students, carry out a test of Họ: H = Ha:u > 110 Report the P-value of your test and state your conclusion clearly. = 110 b. What are the required assumptions in part (a)?
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1.A chi-square test for independence is being used to evaluate the relationship between two variables, one of which is classified into 3 categories and the second of which is classified into 4 categories. What is the df value for the chi-square statistic? Group of answer choices A.6 B.11 C.4 D.10
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Q1. A psychologist conducted a study on the relationship between introversion and shyness. The values are results for scales of introversion and shyness. High positive scores on each scale indicate high introversion or shyness; and high negative scores indicate low introversion or shyness. Data collected from 10 people as follows: Introversion 4 -7 -1 0 6 7 -4 -9 -5 8 Shyness 11 -7 -1 -3 0 7 -1 -8 -1 5 a) Compute the correlation coefficient relating introversion and shyness scores. b) Find the regression equation which predicts introversion from shyness. c) What introversion score would you predict from a shyness score of 7?