(continue of 9). Find the abosolute value of the teststatistic,under the assumption of equal variance is:1.8122.3231.5343.46 Professor A teaches two sections of Math 2526. Thesetwo sections use a common final exam.The number of students, the average score for final exam,and the standard deviationfor the two sections are: 20, 85, 10; 15, 80, 9,respectively. Find the pooled varianceof these two sections.191.9290.253181494.5

Answered: Image /qna-images/answer/a3fef0a7-e47e-43af-9008-3131d183e1de.jpg

Answered: (continue of 9). Find the abosolute…

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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11. Hypothesis Test of Equal Variances. Test the given claim. Use a significance level of a = 0.05 and assume that all populations are normally distributed. Claim: The treatment population and the placebo population have different variances. n = 16, x = 21.33, s = 0.80 n = 41, x = 25.34, s = 0.40 Treatment group : Placebo group :
Is there a difference between the ages of Actors and Actresses? The table shows the ages of Actors and Actress when they received their first Oscar. Assume that the two samples are randomly selected. At the 0.1 significance level, test the claim that there is a mean difference in the ages of Actors and Actresses. (Be sure to subtract in the same direction). Actor (years) Actress (years) Difference (years) 60 60 52 56 61 61 62 58 36 36 49 51 45 50 What are the correct hypotheses? (Select the correct symbols and values.) Họ: Select an answer ? v Select an answer H1: Select an answer v ? v Select an answer Original Claim = Select an answer df = 15
The data from an independent-measures research study produce a sample mean difference of 4 points and a pooled variance of 16. If there are n = 8 scores in each sample, then what is the estimated standard error for the sample mean difference? Select one: O a. 4 O b. 16 O c. 128 O d. 2
A manufacturer of bolts has a quality control policy that requires it to destroy any bolts that are more than 2 standard deviations from the mean. A sample of 15 bolts were tested and their variance was recorded to be 10. Stating any assumptions you need to make, test, at the 5% level, whether the bolts are meeting the established standard.
Five students took a self-confidence test. Their deviation scores were –4, +3, +1, –2, and +2. Assuming that these scores com form a normaldistribution, which deviation represents the highest raw score?
Use Chebyshevs rule and the empirical rule to describe the distribution of this data set. Count the actual number of observations that fall within one, two, and three standard deviations of the mean if the data set and compare these counts with the description of the the data set I developed.
Astudy was done on body temperatures of men and women. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level for both parts.
Please do not use/copy other's answer especially on chegg. Please answer this one using your own answer
(5). Calculate SS, variance and standard deviation for the following sample of n=7 scores: 8, 6, 5, 2, 6, 3, 5.
A random sample of 33 professional baseball salaries from 1985 through 2015 was selected. The league of the player (American or National) was also recorded. Salary (in thousands of dollars) and league are shown in the accompanying table. Test the hypothesis that there is a difference in the mean salary of players in each league. Assume the distributions are Normal enough to use the t-test. Use a significance level of 0.05. Click the icon to view the data table. --..- Determine the hypotheses for this test. Let u, be the population mean salary of players in the American League and let pn be the population mean salary of players in the National League. Choose the correct answer below. O B. Ho: Ha = Hn O C. Ho: Ha = Hn Ha: Ha > Hn A. Ho: Ha = Hn. Ha: Ha + Hn Ha: Ha Hn Ha: Ha = Hn Ha: Ha = Hn Ha: Ha = Hn Find the test statistic for this test. t= (Round to two decimal places as needed.)
In a packing plant, a machine packs cartons with jars. It is supposed that a new machine will pack faster on the average than the machine currently used. New machine: X1 bar = 40.12, s1 = 0.656, nl = 12 Old machine: X2 bar = 43.54, s2 = 0.760, n2 = 12 These are independent samples. Find the pooled variance?
Which samples show unequal variances? Use a = .10 in all tests. Show the critical values and degrees of freedom clearly and illustrate the decision rule. s1 = 10.2, n1 = 22, s2 = 6.4, n2 = 16, two-tailed test s1 = .89, n1 = 25, s2 = .67, n2 = 18, right tailed test s1 = 124, n1 = 12, s2 = 260, n2 = 10, left-tailed test

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(continue of 9). Find the abosolute value of the test statistic, under the assumption of equal variance is: 1 1.81 2 2.32 3 1.53 4 3.46