5.14 Social network densities. Social networks involve inter-actions (connections) between members of the network.Sociologists define network density as the ratio of actualnetwork connections to the number of possible one-to-oneconnections. For example, a network with 10 members has()-C) = 45 total possible connections. If that network has||only 5 connections, the network density is 5/45 = .111.Sociologists at the University of Michigan assumed that thedensity x of a social network would follow a uniform distri-bution between 0 and 1 (Social Networks, 2010).a. On average, what is the density of a randomly selectedsocial network?b. What is the probability that the randomly selected net-work has a density higher than .7?c. Consider a social network with only 2 members. Explainwhy the uniform model would not be a good approxi-mation for the distribution of network density.

Answered: 45 total possible connections. If that…

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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Consider the following data set for an office structure built by Anderson Construction Co. The completed building is nine stories. However, construction was interrupted by a fire after 5.3357 floors were completed. At the time of the fire, Anderson had used 54,067 hours of labor to construct the first 5.3357 stories of the building. It then took Anderson an additional 40,750 labor hours to complete this nine-story building. In this problem, FLRCOM is the number of floors completed, and HOURS is cumulative labor hours to complete the number of floors given by FLRCOM. Enter the data for FLRCOM and HOURS in Minitab and use one command to create a variable which is the square of FLRCOM. Call this new variable FLRCOMSQ. Estimate the function: HOURS = a + b(FLRCOM) + c(FLRCOMSQ). Graph this equation. Assume that the fire caused construction to slow down and caused a reduction in efficiency in completing the building. Estimate the number of labor hours needed to complete the building if…
Suppose the following table gives the extra travel time each year, in hours, for peak-period travelers in urban areas with more than 3 million people. Urban Area Annual Hours ofDelay per Traveler Los Angeles–Long Beach–Santa Ana, Ca 67 San Francisco–Oakland, CA 50 Atlanta, GA 61 Washington (D.C.–VA–MD) 66 Dallas–Fort Worth–Arlington, TX 53 Houston, TX 57 Find the mean of the extra travel time each year, in hours, for peak-period travelers in urban areas with more than 3 million people. (Round your answer to two decimal places.)hrWhat is the standard deviation for these data? (Round your answer to two decimal places.)hr the standard deviation isnt 6.8993
Which of the following statements is incorrect?(A) Both dotplots and stemplots can show symmetry, gaps, clusters, and outliers.(B) Sets with different distribution shapes can have identical boxplots.(C) Boxplots, dotplots, stemplots, and histograms can all show skewness.(D) In histograms, relative areas correspond to relative frequencies.(E) In histograms, frequencies can be determines from relative heights.
A) Was there a significant difference in the number of colds between those who took vitamin c (1) and those that did not (2) B) What was the average number of colds in the group that did take Vitamin C
A sociologist is interested in the relation between x = number of job changes and y = annual salary (in thousands of dollars) for people living in the Nashville area. A random sample of 10 people employed in Nashville provided the following information. x (number of job changes) 5 3 6 6 1 5 9 10 10 3 y (Salary in $1000) 36 37 34 32 32 38 43 37 40 33 Σx = 58; Σy = 362; Σx2 = 422; Σy2 = 13,220; Σxy = 2,165 (a) Find x, y, b, and the equation of the least-squares line. (Round your answers for x and y to two decimal places. Round your least-squares estimates to three decimal places.) x = y = b = ŷ = + x (b) Draw a scatter diagram for the data. Plot the least-squares line on your scatter diagram. (c) Find the sample correlation coefficient r and the coefficient of determination. (Round your answers to three decimal places.) r = r2 = What percentage of variation in y is explained by the least-squares model? (Round your answer to one decimal place.)%

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