Assessing NormalityMany times in statistics it is necessary to see if a set of data values is approximately normallydistributed. There are special techniques that can be used. One technique is to draw ahistogram for the data and see if it is approximately bell-shaped. (Note: It does not have tobe exactly symmetric to be bell-shaped.)The numbers of branches of the 50 top libraries are shown.33678480779759623742365418121933492425229.2431171521242921211319192222304122182026331414162210162426 5. About what percentage of the area under the normaldistribution curve falls within 1 standard deviationabove and below the mean? 2 standard deviations?3 standard deviations?

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Answered: Assessing Normality Many times in…

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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24. When the connected points on a scatterplot make a perfect y=x line, what is its (correlation) r-value? Group of answer choices r = -1 r = 0 r = 1 r = 0.5
Waiting times (in minutes) of customers at a bank where all customers enter a single waiting line and a bank where customers wait in individual lines at three different teller windows are listed below. Find the coefficient of variation for each of the two sets of data, then compare the variation. Bank A (single line): 6.6 6.7 6.7 6.8 7.0 7.2 7.5 7.7 7.7 7.7 6.7 7.7 7.8 8.4 9.2 9.7 Bank B (individual 4.1 5.4 5.8 6.2 lines): www The coefficient of variation for the waiting times at Bank A is%. (Round to one decimal place as needed.)
Draw a scatter diagram and find r for the data shown in the table. (Round r to three decimal places.) x y 10 15 20 42 30 60 30 54 50 70 60 85 find r
At Bats and Hits The data below show the number of three-base hits (triples) and the number of home runs hit during the season by a random sample of MLB teams. Is there a significant relationship between the data? Triples 25 24 34 31 19 29 Home runs 312 236 301 279 276 270 Send data to Excel Part 1 of 5 Your Answer is correct (a) Draw the scatter plot for the variables. At Bats and Hits Home runs y 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 x 5 10 15 20 25 30 35 40 45 50 55 60 0 Triples Part: 1 / 5 1 of 5 Parts Complete Part 2 of 5 (b) Compute the value of the correlation coefficient. Round your answer to at least three decimal places. r=?
Attention: These data are different from your previous questions! Now Lynn takes a different approach. They collect another two samples - GPA from students taking a semester of in-class courses, and then the same students' GPA when they are taking a semester of online courses. The data set is below. They predict that they will find a difference between in-class GPA and online GPA for the same students. Differences Between GPA's Student In Class GPA Online GPA Amy 4.0 3.5 Brad 3.5 2.2 Caroline 3.7 2.0 Dan 3.5 3.5 Emily 3.6 3.3 Frank 3.2 3.2 George 3.3 2.1 What is the t-statistic for this t-test? (Round to 2 decimal places.)
Can a normal approximation be used for a sampling distribution of sample means from a population with u = 55 and o = 10, when n = 4? Answer E Tables E Keypad Keyboard Shortcuts O Yes, because the mean is greater than 30. O Yes, because the sample size is less than 30. O No, because the sample size is less than 30. O No, because the standard deviation is too small.
Family Heights. In Exercises 1–5, use the following heights (in.) The data are matched so that each column consists of heights from the same family. Scatterplot Construct a scatterplot of the father/son heights, then interpret it.
A city wants to know if a new advertising campaign to make citizens aware of the dangers of driving after drinking has been effective. The accompanying table shows the number of drivers who have been stopped with more alcohol in their systems than the law allows for each day of the week in the week before and the week a month after the campaign starts. Assume that the data from each population is Normally distributed. Complete parts a through i below. A. Are the data paired? Explain. B. Compute the mean difference C. Compute the standard deviation of the differences. D. Compute the standard error of the mean difference. E. Find the value of the t-statistic. F. How many degrees of freedom does the t-statistic have? G. Is the alternative one- or two-sided? Explain. H. What is the P-value associated with this t-statistic? Assume that the other assumptions and conditions for inference are met.
What do you think the distribution of each of the following data sets will look like? Be sure to discuss shape, center, and spread. Ages of the faculty members at your school. → BIU A - LE3 x²x₂ E 12pt T Paragraph M EE 2
What is the coefficient of the dummy variable? What is the meaning of the coefficient of the dummy variable?
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