?Which of the following statements is correctthe z-test can be used when the population standard deviation are known regardless .A.of the sample sizesnone of the statements are true. .Ball of the statements are true .C OX-Y-DoT =.Dthe pooled-variances t-test :is used whenever the populationSPV n1.standard deviations can be assumed to be equaln2the z-test can be used when the population standard deviation are unknown but .E O(sample sizes are large (typically greater than 30

The z test is used when the population standard deviation is known and also when the sample size is…

?Which of the following statements is correc the z-test can be used when the population standard deviation are known regardless .A O .of the sample sizes none of the statements are true. .B O all of the statements are true .C O X-Y- Do .D O is used whenever the population T== the pooled-variances t-test : .standard deviations can be assumed to be equal the z-test can be used when the population standard deviation are unknown but .E O (sample sizes are large (typically greater than 30

?Which of the following statements is correc the z-test can be used when the population standard deviation are known regardless .A O .of the sample sizes none of the statements are true. .B O all of the statements are true .C O X-Y- Do .D O is used whenever the population T== the pooled-variances t-test : .standard deviations can be assumed to be equal the z-test can be used when the population standard deviation are unknown but .E O (sample sizes are large (typically greater than 30

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 you calculate a z-score of -2.2 and the distribution is normal. Then which of the following is a correct interpretation? Group of answer choices None of the above are justified interpretations The observation is about 2.2 standard deviations less than the mean. This means it is less than all but roughly 2.5% of the observations. The observation is about 2.2 times the variance less than the mean. This means it is less than all but roughly 5% of the observations The observation is about 2.2 times the variance less than the mean. This means it is less than all but roughly 2.5% of the observations. The observation is about 2.2 standard deviations less than the mean. This means it is less than all but roughly 5% of the observations.
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Consider the following sample data. Sample A: 11, 22, 33 Sample B: 81, 92, 103 Sample C: 1,100; 1,111; 1,122 (a) Find the mean and standard deviation for each sample. Sample A: Sample B: Sample C: Mean Sample Standard Deviation (b) What does this exercise show about the standard deviation? multiple choice The idea is to illustrate that the standard deviation is not a function of the value of the mean. The idea is to illustrate that the standard deviation is a function of the value of the mean.
10 An instructor of statistics claims that students in his section will score smaller than the students in a colleague’s section. The mean statistics score for 33 students in his section is 25.5 and the standard deviation is 4.1. The mean statistics score for 31 of the colleague’s students is 26.7 and the standard deviation is 4.5. At a = 0.01. Can the instructor’s claim be supported? According to this information the null and alternative hypotheses are: Select one: a. H0: μ1 ≤ μ2Ha: μ1 > μ2 b. H0: μ1 ≥ μ2 Ha: μ1 < μ2 c. H0: μ1 < μ2 Ha: μ1 > μ2 d. H0: μ1 > μ2 Ha: μ1 ≤ μ2
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