Suppose a sample of O-rings was obtained and the wall thickness (in inches) of each was recorded. Use a normal probability plot toassess whether the sample data could have come from a population that is normally distributed.0.156 0.193 0.207 0.218 O0.228 0.231 0.234 0.2390.256 0.263 0.272 0.2830.284 0.301 0.319 0.334Click here to view the table of critical values.Click here to view page 1 of the standard normal distribution table.Click here to view page 2 of the standard normal distribution table.O A. No. The correlation between the expected z-scores and the observed data,conclude that the data come from a normal population.does not exceed the critical value,Therefore, it is reasonable toO B. Yes. The correlation between the expected z-scores and the observed data,that the data come from a normal population.exceeds the critical value,Therefore, it is not reasonable to concludeO C. No. The correlation between the expected z-scores and the observed data,does not exceed the critical value,Therefore, it is not reasonable toconclude that the data come from a normal population.O D. Yes. The correlation between the expected z-scores and the observed data,that the data come from a normal population.exceeds the critical value,Therefore, it is reasonable to conclude

z-score is the value decreased by mean, divided by the standard deviation. The z-score for a sample…

Answered: O A. No. The correlation between the…

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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1. You have recorded the height and weight of 27 people. Suppose that your data meet the assumptions of correlation (data are normally distributed for both variables). You find that the Pearson correlation coefficient r= 0.4. Test whether height and weight are significantly correlated. Show your work. 1. What is the critical value for this test? 2. Write your complete finding with all statistical details.
7. One of advantages of multiple regression is that it allows us to examine the effect of an exposure variable on the outcome variable while adjusting for no other variable in the model. A. TrueB. FalseC. None of the above 8. The particular method of analysis in a research study depends on: A. Research questionB. Study designC. Level of measurementD. All of the aboveE. A and B only 9. Reviewing relevant literature exposes the researcher to specific designs used by previous researchers. A. TrueB. FalseC. None of the above
Suppose you will perform a test to determine whether there is sufficient evidence
will this be sufficient or is not sufficient evidence.
16
Professor Nord stated that the mean score on the final exam from all the years he has been teaching is a 79%. Colby was in his most recent class, and his class’s mean score on the final exam was 82%. Colby decided to run a hypothesis test to determine if the mean score of his class was significantly greater than the mean score of the population. α = .01. What is the mean score of the population? What is the mean score of the sample? Is this test one-tailed or two-tailed? Why?
2. A law school releases admissions data from past years. The median score on the LSAT for accepted students was 167. (Scores on the LSAT range from 120 to 180 points.) The first and third quartiles of LSAT scores for accepted students were 155 and 173 points, respectively. (a) Roughly sketch a histogram for what the LSAT scores for accepted students might look like based on the information given. (b) Suppose you are applying to this law school, and you read about an experiment for a new LSAT test-preparation course. Two hundred students participated. Of these, 100 were randomly chosen to take the course. They got an average score of 166 points, with an SD of 17 points. The other 100 students did not take the course and studied on their own. They got an average score of 165 points, with an SD of 18 points. Calculate the two-sample z test statistic and p-value for the null hypothesis that the course does not affect scores.
18. A set of n = 52 pairs of scores (X and Y values) in a research study has a Pearson correlation of r = -0.7. What percentage of the variance for the Y scores is predicted by its relationship with X?
Given that the means of x and y are 64 and 66 , their standard deviations are 2.8 and 3.2 respectively and the coefficient of correlation between them is 0.5. 1) write down the regression lines.
Which of the following is not a sample property of OLS? a. Sample covariance of each included variable and the residuals is zero b. the sum of all residuals is zero c. the average of all residuals is zero d. the covariance of x and y is on the regression line.
1.A chi-square test for independence is being used to evaluate the relationship between two variables, one of which is classified into 2 categories and the second of which is classified into 4 categories. What is the df value for the chi-square statistic? a. df = 2 b. df = 6 c. df = 7 d. df = 3

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