Test the claim that the mean GPA of night students is smaller than the mean GPA of day students atthe 0.05 significance level.The null and alternative hypothesis would be:Ho: PN PD Ho:μN ≤ μD Ho: PN ≥ PD Ho:μN ≥ μD H₁:μN = μD Ho: PN = PDHi:pN>pDH:[N>UD H:pN

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Answered: The null and alternative hypothesis…

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 coach believes that her volleyball team is more athletic than the average volleyball team in America. (Think of that as her research hypothesis.) We know that the average volleyball team in America has a score of 100 on the Standard Test for Athleticism (the STA; not to be confused with the SAT). The coach tests her 25 players and gets an average STA score for them of 109, with a standard deviation of 15. The coach sets her alpha level at .05. Given the results of her study, what decision should she make? Reject the null hypothesis, since she knows that her team plays so well. Reject the null hypothesis, since the mean is above 100 Reject the null hypothesis, since the inferential Z-score is greater than the critical value when alpha is at .05 Do not reject the null hypothesis; the results are likely due to chance factors.
The null and alternate hypotheses are: He: P₁ =H₂ H₁ H₁ #P₂ A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12. A random sample of 17 observations from the second population revealed a sample mean of 342 and a sample standard deviation of 15. The population variances are assumed to be equal. At the 0.10 significance level, is there a difference in the population means? a. Is this a one-tailed or a two-tailed test? O One-tailed test. OTwo-tailed test. b. State the decision rule. (Negative amounts should be indicated by a minus sign. Round your answers to 3 decimal places.) The decision rule is to reject H0 if t
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You wish to test the following claim (HaHa) at a significance level of α=0.02α=0.02. Ho:μ=72.2Ho:μ=72.2 Ha:μ≠72.2Ha:μ≠72.2You believe the population is normally distributed, but you do not know the standard deviation. You obtain a sample of size n=22 with mean M=68.6 and a standard deviation of SD=20.9What is the test statistic for this sample? (Report answer accurate to three decimal places.)test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.)p-value =
A report states that the mean yearly salary offer for students graduating with a degree in accounting is $48,722. Suppose that a random sample of 50 accounting graduates at a large university who received job offers resulted in a mean offer of $49,870 and a standard deviation of $3900. Do the sample data provide strong support for the claim that the mean salary offer for accounting graduates of this university is higher than the national average of $48,722? Ho: μ = Ha: (Put in the correct symbol and value) ✓ Select an answer a not = P-value: = ↑ Based on the above we choose to Select an answer Question Help: Post to forum Submit Question
Suppose the national average dollar amount for an automobile insurance claim is $670.543. You work for an agency in Michigan and you are interested in whether or not the state average is different from the national average. The hypotheses for this scenario are as follows: Null Hypothesis: μ = 670.543, Alternative Hypothesis: μ ≠ 670.543. A random sample of 27 claims shows an average amount of $668.645 with a standard deviation of $68.6867. What is the test statistic and p-value for this test? Question 8 options: 1) Test Statistic: -0.144, P-Value: 0.44345 2) Test Statistic: -0.144, P-Value: 0.5566 3) Test Statistic: -0.144, P-Value: 1.5566 4) Test Statistic: 0.144, P-Value: 0.8869 5) Test Statistic: -0.144, P-Value: 0.8869
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Under what circumstances is a t statistic used instead of a z-score for a hypothesis test? 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. Determine the critical region using a one-tailed test with alpha = .05. Conduct the hypothesis test (Do the math and compare the t-critical and t-obtained values). State your conclusions in terms of H0 (Should you reject the H0 or fail to reject/accept the H0). Based on your analysis, is there a relationship between the drug and attention span?
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The null and alternative hypothesis would be: Ho: PN PD Ho:N ≤D Ho: PN ≥ PD H₁: PN > PD H₁: μN > HD H₁:PN