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Analysis of Variance

Several ANOVA problems

1. Jointsoft is a great over-the-counter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get their messages across. Currently, their best modes of advertisement are commerci

Business Uses of ANOVA

Analysis of variance (ANOVA) is used to determine if there is a difference between the means of different populations. This is an example from a student in Prescott Arizona. A company was trying to sell her the feed they produced by claiming that if her hens ate their feed, the hens would produce more eggs. They offered her a s

One-way ANOVA and Post-Hoc Comparison's test

A random selection of accounting firms from three regions is taken and they are asked to state the starting salary for a new accounting graduate. Do a one-way ANOVA to analyze these data using a 1% level of significance: South Northeast West --------- ----------- --------- $30500 $41000 $3

ANOVA Test on Mean Income of Families

Please answer the question below. Please submit your solution as an Excel attachment and be sure to show ALL calculations that you use to prepare the ANOVA table. A real estate developer is considering investing in a shopping mall on the outskirts of Atlanta, Georgia. Three parcels of land are being evaluated. A random sample

Use a .05 significance level to test the null hypothesis

The head injury data are given below. Use a 0.05 significance level to test the null hypothesis that the different weight categories have the same mean. Do the data suggest that larger cars are safer? Subcompact 681 428 917 898 420 Compact 643 655 442 514 525 Midsize 469 727 525 454 259 Full-size 384 656 602 687 360

Find the null/alternative hypothesis, and compute values

Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level. Treatment 1: 8,11,10 Treatment 2: 3,2,1,3,2 Treatment 3: 3,4,5,4 a. state the null hypothesis and the alternative hypotheseis b. what is the decision rule? c. Compute sst, sse, and ss total d.


What are the conditions that permit us to use ANOVA? Three conditions.

5 step hypotheses and ANOVA tables

The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of hours

Classic One-Way ANOVA

Hi, This is very confusing to me and I feel lost, can you help me find the answers to these questions: 1. A professor had students in a large marketing class rate his performance as excellent, good, fair, or poor. A graduate student collected the ratings and assumed the students that the professor would not receive them u


An ANOVA test was conducted with respect to the population mean. The null hypothesis was rejected. This indicates 1. There were too many degrees of freedom. 2. There is no difference between the population means. 3. There is a difference between at least two population means. 4. A larger sample should be selected. 5. None o

Please create ANOVA test in Excel for the attached data.

Please use the information in the attached Word document table to create an ANOVA test. Then, perform an ANOVA on your data using any method of computation. Note: Methods of computation could include the usage of Excel - see below for Hypotheses: Let's compare 3 companies; annual stock performance to determine if the v

Find the best model

We are predicting the number of units sold for a local factory that produces snowmobiles. The available annual data are the expenses (in $000), the number of employees, and the rainfall (in in.). Find the best model using the following table. Year Expenses #Employees Rainfall Units Sold 1987 5300

ANOVA Testing

Function In-house Outsource Art Direction 100,000.00 500,000.00 Graphic Design 350,000.00 500,000.00 Print Buy/Design & Production 100,000.00 250,000.00 Production

Differences between hypotheses testing methods

Describe in detail the differences in ANOVA and the five-step hypothesis testing method. 1. State hypothesis and alternate. 2. Level of significance 3. Identify test statistic 4. Formulate decision rule 5. Make the decision to accept or reject null hypothesis

2 Problems

Both of problems should be in excel file. 1. Did you ever purchase a bag of M&M's candies and wonder about the distribution of colors? You can go to the website and click the United States on the map, the click About M&M's, then History, Products, and Peanut and find the percentage breakdown according to t

The one-tailed test with the rejection area in the upper tail of the z-curve was used. Computed z-score was 1.79. What does it mean? At 0.05 level of significance, is there a difference in the mean numbers of cameras sold at the three department store chains? At the .05 level of significance, determine whether there is a relation between the income level and the type of vehicle purchased.

1) Experiment was conducted at the .01 level of significance. The one-tailed test with the rejection area in the upper tail of the z-curve was used. Computed z-score was 1.79. What does it mean? A. We should reject H0 and accept H1. B. We should not reject H0. C. We should have used the .05 level of significance. D. We shou

Descriptive Statistics

Three universities administer the same comprehensive examination to the recipients of MBA degree. From each university, a random sample of MBA recipients was selected, and these recipients were then given the exam. The following scores were recorded. For university A: 89, 95, 75, 92, 99. For university B: 60, 95, 89, 80. For uni

Testing Hypotheses in Statistics

The following is sample information. Test the hypothesis that the treatment means are equal. Use the .05 significance level. (See attached file). a. State the null hypothesis and the alternate hypothesis. b. What is the decision rule? c. Compute SST, SSE, and SS total. d. Complete an ANOVA table. e. State your decision

Analysis of Variance Post Hoc Analysis

A seminar is given to three levels of managers (highlevel, midlevel, lowlevel).The facilitators believe the evaluations may vary with the audience. The ratings are on a scale from 1-10 with 10 being the highest. Use a one-way ANOVA to determine whether there is a significant difference in evaluations according to manager level

Statistical assumptions and results

The attached data set is a study that was conducted to determine whether there is a difference between three types of therapy. The participants in this study were clients who agreed to participate. Participants were randomly assigned to the three therapy types, carried out by equivalently skilled therapists. The outcome score

Psychology statistical analysis

Researchers conduct a study in which three groups of research participants are exposed to three different conditions, after which their heart rate is measured. In condition one, the group is asked to place their right hand for three minutes into a pot of water that is 90 degrees. In condition two, the second group is asked to

Difference in Mean Production Rate

The Chapin Manufacturing Company operates 24 hours a day, five days a week. The workers rotate shifts each week. Management is interested in whether there is a difference in the number of units produced when the employees work on various shifts. A sample of five workers is selected and their output recorded on each shift. At the

Test if there is significant difference between means of 3 samples.

16-9. At, the median salary for a chiropractor in Kansas is $82,400 per year. A group of recent graduates believe this amount is too low. In a random sample of 205 chiropractors who recently graduated, 170 began with a salary of more than $82,400 and five earned a salary of exactly $82,400. 1. State the null an

ANOVA tables for description of problems.

Fill in the missing entries using a one-way ANOVA table. Source DF SS MS=SS/df F- statistic Treatment 2.124 0.708 0.75 Error 20 Total Construct the one way ANOVA table for the data. Compute SSTR and SSE using the defining formula: SST = sum(x-xbar) squared SSTR = sum of size of sample from population (me