Explore BrainMass

Explore BrainMass

    Chi-Squared Test

    BrainMass Solutions Available for Instant Download

    The solution gives the details of chi square test for independence.

    For many years TV executives used the guideline that 30 percent of the audience were watching each of the prime-time networks and 10 percent were watching cable stations on a weekday night. A random sample of 500 viewers in the Tampa-St. Petersburg, Florida, area last Monday night showed that 165 homes were tuned in to the ABC a

    Managerial Decision Making - Statistics Problem

    Refer to the Baseball 2002 data, which reports information on the 30 Major League Baseball teams for the 2002 season. Set up a variable that divides the teams into two groups, those that had a winning season and those that did not. There are 162 games in the season, so define a winning season as having won 81 or more games. Next

    Chi square test

    A wholesaler has recently developed a computerized sales invoicing system. Prior to implementing the new system, the manager of the store believes that the following are in fact the percentages of the number of the errors per invoice: Errors per invoice 0 1 2 3 More than 3 Percentages .87 .08 .03 .01 .01 Afte

    Explain an Ellipse Fitting Solution

    The first topic concerns a solution for ellipse fitting [Attachment: FittingEllipse.pdf Michael J. Aramini, Ellipse-Fitting, http://mysite.verizon.net/~vze2vrva/ellipse_fitting.html, May 2007]. 1. The expression being minimized (left hand side looks like chi-square): A. Is it chi-square? B. If it is chi-square, what i

    Independent and dependent variables problem

    Please help question the following problem. A random sample of 100 adult workers, 60 men and 40 women, is selected in a large Midwestern city. Of the group, 42 men and 17 women are union members. Does union membership differ on the basis of gender? State the independent and dependent variables.

    Chi square test for independence problem

    Please help with the following problem. A SOCIAL SCIENTIST CROSS-CLASSIFIES THE RESPONSES OF 100 RANDOMLY SELECTED PEOPLE ON THE BASIS OF GENDER AND WHETHER OR NOT THEY FAVOR STRONG GUN CONTROL LAWS. SHE OBTAINED THE FOLLOWING DATA: FAVOR OPPOSE

    Chi Squared Test

    You want to know if car ownership is independent. a table below gives the number of cars versus telephones owned in a two way table. Given the data, are telephone ownership and automobile ownership independent? Use a chi squared test to verify your decision. Automobiles Owned

    Earl Babbie Measure of Association nominal level variable exercise

    Below is hypothetical data representing the relationship between 2 nominal level variables, race and political party affiliation. YOU MUST SELECT A MEASURE OF ASSOCIATION (Lamda) appropriate for examining the relationship AND COMPUTE IT SHOWING YOUR CALCULATIONS & INTERPRETING THE RESULTS!!!!!

    Chi Square Problem

    Construct a percentage table from the following frequency distribution. (Be sure to construct it using Babbie's recommendations.) What measure of association would be appropriate for this table? Why? Calculate the value of Chi Square and determine the value of p using Appendix E. Are the results significant at the 0.05, 0.01,

    Hypothesis Questions

    1. What is the null and alternative hypothesis to test whether a person?s educational level is dependent or independent of his or her race/gender classification? 2. Looking at the p-value, would you accept or reject the null hypothesis? 3. What are the implications of your test for education and demographic characteristi

    Null hypothesis, chi-square, t-test

    3). Data from the 2002 GSS show that 84.3 percent (198 out of 235) of females and 75 percent (198 out of 264) of males are in favour of requiring gun permits. You wonder whether there is any difference between males and females in the population in their support for gun permits. Use a test of the difference between proportions w

    Two samples: estimating the ratio of two variances

    72. A random sample of 20 students obtained a mean of x = 72 and a variance of s2 = 16 on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% confidence interval for sigma^2. 78. Construct a 90% confidence interval for (sigma^2)1/(sigma^2)2 in Exercise 43. Were we jus

    Chi Square Test

    Because of the stressful working environment, employees at Au & Associates are prone to criminal activities. The following data represent the number of various types of crimes by gender in a random sample of 750 wayward employees at Au & Associates. Gender Personal Assault Property Damage Drug Abuse Public Disorder

    Chi Square test of independence

    The top executives of Company X would like to reduce the blood pressure of hapless employees. They came up with a miracle drug call MiracleOww. Unfortunately, there may be a side effect, abnormal anxiety, associated with the miracle drug. When they carried out a clinical test of the miracle drug, employees were randomly divid

    Chi Square Analysis for Company X on Criminal Activities

    Because of the stressful working environment, employees at Company X are prone to criminal activities. The following data represent the number of various types of crimes by gender in a random sample of 750 wayward employees at Company X. Gender Personal Assault Property Damage Drug Abuse Public Disorder Female

    Hypothesis testing involving standard deviations

    68. Past experience indicates that the time required for high school seniors to complete a standardized test is a normal random variable with a standard deviation of 6 minutes. Test the hypothesis that sigma = 6 against the alternative that sigma < 6 if a random sample of 20 high school seniors has a standard deviations s = 4.

    Stats Study Guide

    See attached file for full problem description. 49. _____________ frequencies are the actual number of observations that fall into each class in a frequency distribution or histogram. a. Expected b. Uniform c. Observed d. Independent e. Dependent 50. _______________ frequencies are the n

    Chi-square test of independence, goodness of fit

    1) Suppose we have a multinomial population with four categories: A, B, C, and D. The null hypothesis is that the proportion of items is the same in every category. The null hypothesis is H : p = p = p = p = .25 º ª b c d A sample

    Chi square test of Independence.

    15. Where do women most often buy casual clothing? Data from the U.S. Shopper Database provided the following percentages for women shopping at each of the various outlets. Outlet Percentage Outlet Percentage Wal mart 24

    Chi Squared Distribution: Concentration of Lactic Acid

    1. Suppose that we will sample 20 chunks of cheese in Example 7.2.1. Let T = .... where Xi is the concentration of lactic acid in the ith chunk. Assume that sigma^2 = 0.09. What number c satisfies Pr(T<c)=0.9? Please see the attached file for the fully formatted question.

    Chi Square Test for Numbers of Citations

    Enclosed table compares numbers of citations written by six different police officers. Simmons 61 Hunt 37 Johnson 42 Alves 59 Smith 45 Wilson 64 Can we conclude that there is a difference in number of citations writte

    Calculation of non parametric test for independence

    The chief of security for the Mall of the Dakotas was directed to study the problem of missing goods. He selected a sample of 100 boxes that had been tampered with and ascertained that for 60 of the boxes, the missing pants, shoes, and so on were attributed to shoplifting. For 30 other boxes employees had stolen the goods, and f

    Conduct and Interpret Analysis of Correlation

    An instructor asks students in his class to indicate whether or not they agree with the opinions of three different speakers. Speaker 1 Speaker 2 Speaker 3 Agree 17 29 25 Disagree 33 21 25 Conduct and interpret the app

    Chi Square Test of Independence on Samples

    3. Suppose that a sociologist determines from the census report that the distribution of people in various occupations in a specific geographic area are as follows: He samples individuals who are members of a particular political party to see if the distribution of occupations are the same. a. Conduct and interpret the