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Analysis of Variance

ANOVA, Mean Square and Common Pop Variance

In an effort to counteract student cheating, the professor of a large class created four versions of a midterm exam, distributing the four versions among the students in the class. After the exam, students from the class got together and petitioned to nullify the results on the grounds that the four versions were not equal in

Managerial Decision Making - Statistics Problem ANOVA

Refer to the Baseball 2002 data, which reports information on the 30 Major League Baseball teams for the 2002 season. a. At the .10 significance level, is there a difference in the variation of the number of stolen bases among the teams that play their home games on natural grass versus on artificial turf? b. Create a vari

The answer to ANOVA problems

For the time being, the air traffic control system in the United States is run by the federal government. Several groups disagree with this and would like to privatize the air traffic control system. Among the arguments given for privatization is that flight delays are much too common in the United States. A first step in decidi

Testing difference between the additives used to reduce pollution by chemical waste. One way ANOVA test is to be used to work out this problem. For complete description of the question, please see the actual question posted.

Three companies are attempting to sell you a pollution reduction additive to your chemical waste. Given limited resources, which prevents you from developing the additive yourself, you get each company to give you a sample to the product. You are able to use it on ten batches each. You use it on the same machines. The parameter

Analysis of Variance (ANOVA)

WidgeCorp became the market leader in snack foods after acquiring a rival company, Company W. Their management style and business decision-making differed. Employees at WidgeCorp collected relevant data and through statistical analysis used this information to draw conclusions and make appropriate recommendations. Company W tend

Statistics Questions

1. Increasing the number of scores in a sample from n = 10 to n = 20 will increase the width of a confidence interval to estimate the population mean. (Assume all other factors are held constant.) True False 2. An educational psychologist gives a group of third-grade students a reading test at the begi

SAS Analysis of Variance

I've pasted my SAS data below. If you need to use Stata or a similar program that is OK (but I would prefer SAS) 1. Write a model for this experiment 2. Conduct an analysis of variance 3. Compute the relative efficiency of the Latin square design relative to a completely randomized design. Interpret this value. Were the b

ANOVA Testing

I have four categories, for instance, age, sex, zone and weight. I am asked if the average weight of the population differs among the four zones, and the sexes. I performed a one way anova test for weight and zones then another for weight and sex. Is this correct? I then performed a one way anova test of the zones versus age

ANVOA Test and Explanation of work

The organization would like to determine if three of their territories are in fact meeting average profit margin expectations of 35% or if there is a variance depending on market region. Perform an ANOVA on the data presented in the attachment. 1) Please provide explanations during the steps 2) Show corresponding work

T-test and ANOVA- Statistics

Enter the attached data given to you into an Excel spreadsheet, calculate the requested statistics, and answer the following questions. Data from Total Knee Replacement (TKR) patients was collected from 3 different clinics. The data that is given to you includes: Subject number, age, clinic and range of motion (ROM) measurem

Statistics/ Two-Way ANOVA Exercise

An experiment is conducted to study the effects of two sales approaches - high-pressure (H) and low-pressure (L) - and to study the effects of two sales pitches (1 and 2) on the weekly sales of a product. The data (Results of the Sales Approach Experiment) in the attached table are obtained by using a completely randomized desig

ANOVA - Analysis of Variance

Please show me how to do problem 8.11 (I've scanned the page containing this problem). My instructor also wrote: *For part (a) use F.05 (2,90) < F.05(2,87) < F0.05 (2,60) *For part (b) t0.025 (87) = 2.2809 Of course that should really be "F- subscript - 0.05", etc but I couldn't use subscripts in this text box.

Anova for a Call Center

Response Time Type of Call 25.22 Fee Refund 25.01 Fee Refund 25.1 Fee Refund 24.89 Fee Refund Question 25.23 Missing Deposit Does the type of call affect the response time of the call center? 24.97 Missing Deposit Is it statistically significant? 25.07 Missing Deposit 24.81 Missing Deposit 25.18 Copy of a

Statistics: Analyzing Literary Data

The literary styles of different authors can vary widely. In particular, one factor that may differ is the word length of sentences. Here are two (fiction) novels of reasonable length, written in English and by two different authors. Novel 1: Memoirs of a Geisha by Arthur Golden. Novel 2: The Pact by Jodi Picoult. To get

ANOVA Test Comparison

Here is the problem and I need help I am in a group and no one is helping me. I have talked to the teacher and now i have to do it by myself and turn in the assignment. I have struggling bad in this class. PLEASE HELP ME. In this regard, remember the goal will be to work through an ANOVA test to compare the means of three o

ANOVA for resist thickness, develop time, and exposure data

You are the engineer for a paint process. You'd like to improve the quality of the process. You have selected your response variable, which is ppm of dust. You have sixteen measurements that you take, you have 3 variables [resist thickness, develop time, and exposure]. You have two levels of each of the variables [say, lev

Critical Range for Tukey-Kramer

Critical Range for Tukey-Kramer. See attached file for full problem description. Answer The null hypothesis tested is H0: There is no significant difference in the population mean of downhill coasting speed of 4 brands of bi cycles Here one way ANOVA can be used as there is only one categorical variable b). ANOVA

Statistical Problem Assistance: Difference in the Mean

Professor Brunner had students in his Marketing class rate his performance as Excellent, Good, Fair, or Poor. A graduate student collected the ratings and assured the students that Professor Brunner would not receive them until after the course grades had been submitted. The rating (the treatment) a student gave the professor wa

Earth Engineering ANOVA Testing

Earth Engineering is an environmental engineering consulting firm with more than 50 offices nationwide. Within the state of Texas, there are 5 offices; however, the focus of this problem resides with the office located in Austin. The Austin office currently houses 54 employees; however, the original office space of 10,000 square


Scenario: Surging Fuel Prices Situation: ABC Trucking Company purchased 15 trucks at the same time to start their business. 5 Trucks were purchased from Peterbilt, 5 from Freightliner, and 5 from Kenworth. All the trucks are used for long distance hauling. The cost of fuel for the first year is shown. Is there a significant

Difference in Mean Shop Hours Across Departments

The president of a new car dealership professional association wishes to study the number of hours department heads spend on the floor of their shops weekly by department. The manager selected a sample of five department heads from each of three shops from among area dealerships. At the .05 significance level, can she conclude

Questions on ANOVA

1. What is the Null Hypothesis in the ANOVA test? The Alternate Hypothesis? Discuss. 2. What is the difference between a One-Way ANOVA and a Two-Way ANOVA? When do you use each?

ANOVA - Group Variance

1. What is meant by within group variance? Between group variance? How does the ANOVA procedure use these concepts? 2. What are the 6 steps to the ANOVA hypothesis test?