Explore BrainMass

Analysis of Variance

Confidence Interval & ANOVA

Problem Set 1: Chapter 12, problems 2, 4, 6, 12; Chapter 13, problems 4, 10, 14, 20, 26 Chapter 12 2. Explain why it would not be reasonable to use estimation after a hypothesis test for which the decision was to 'fail to reject Ho". 4. A researcher has constructed an 80% confidence interval of µ = 45 +/- 8, using a sa

Analysis of Variance: Applied Statistics for Health Care

Please help me with my assignment by answering the following questions: 1) How would you describe the analysis of variance, assuming that your audience has not had a statistics class before? 2) What is an interaction? Describe an example; what are the variables within your population (work, social, academic, etc.) for whic

T Statistic

What of the following is true for the repeated-measures t statistic? df = n1 + n2 - 2 df = n - 1 df = n1 + n2 - 1 df = (n1 - 1) + (n2 - 1)

Hypothesis testing problems : ANOVA

vehicle Miles per gallon xbar variance Panzer 9.3, 9.3 9.3 8.6 8.7 9.3 9.3 9.91 0.10 T-34 8.7, 7.7, 7.7, 8.7, 8.2, 9.0,7.4,7.0 8.03 0.60 Sherman 7.2

Repeated Measures ANOVA with SPSS

2. Repeated Measures ANOVA. Perform a repeated measures ANOVA using the "High_School_Scores.sav" data set. You will use Score_0 through Score_12 as your repeated measure (7 levels), and gender as a fixed factor. a. Is the assumption of sphericity violated? How can you tell? What does this mean in the context of interpreting the

Applying Analytical Strategies to an Area of Research Interest.

Part C. SPSS/PASW Activity The "High_Scool_Scores.sav" file contains a dataset of a high school teacher interested in determining whether his studentsââ?¬â?¢ test scores increase over the course of a 12 week period. In the dataset, you will find the following variables: Participant: unique identifier Gender: Male (

Applied Statistics in Health Care

The objectives here is based on Analysis of Variance (ANOVA) and focused on the understanding of: ââ?¬¢ the appropriate statistical formulas or tests for data analysis ââ?¬¢ the description of the logic of ANOVA and how it compares to t-tests. ââ?¬¢ the details on how ANOVA can be used in more complex exper

ANCOVA SPSS: Analyze and test data for effect of therapies for stalking behavior

See attachments. ANCOVA Stalking is a very disruptive and upsetting experience in which someone (the stalker) constantly harasses or obsesses about another person. Stalking can take many forms, from sending intensely disturbing letters to literally following you around in the places where you live and socialize. A psycholo


1. A researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems. Eight participants are randomly assigned to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral Therapy (CBT), and Interpersonal Therapy (IT). All participants complete the weekly treatment fo

Experimental study sample variance

Hello, can some one please provide an example of a research study that could be analyzed with ANOVA. Identify one example for each of the two types of variability that you would expect to be represented in the MSBS of this ANOVA and clearly identify which example represents error variability and which example represents systemat

ANOVA in Excel

Must see attachment for the problem: I need assistance step by step details in understanding how to work statistics problems in words of interpretation (that helps explain the results and what it represents) and in EXCEL so that I can understand these types of problems in future problems. **If charts are use please prov

Two Way ANOVA: Aircraft Selection Problem

This problem involves a statistical analysis to recommend the best aircraft to purchase using results from different aircrews. While working for a test and evaluation facility you have been asked to make buying and future testing recommendations on the following data for l your service. Two F-16 pilots and one F-18 pilot were

ANOVA for market shares of car rental firms

See attached file. The attached table gives the number of rented cars, out of a random sample, belonging to each of the listed firms in the years 2007, 2008 and 2009. Is there evidence of a change in the market shares of the car rental firms? Investigate at the 5% level of significance.


1. Why use the Wilcoxon T test. What is the hypothesis statements you used? 2. Consider do we prefer working with dependent samples or independent samples? Explain 3. We have the statement "The F-ratio provides the ability to determine the deviation between the population and the means and develop a method of accepting or reje

One way ANOVA: Chi-Square Test

** Please see the attached file for the tables ** Are smoking habits of teenagers related to their parents' smoking? Perform a hypothesis test to determine if the smoking habits of teenagers are independent of the smoking habits of their parents. Test at the 0.05 level of significance. Do the mean heart rate fro the groups

One way ANOVA - Test depression scores for 4 groups

Problem 1: A researcher wants to see if 4 different therapy approaches lead to different scores on a depression inventory. She conducts a study whereby individuals seeking therapy for depression are randomly assigned to 1 of the 4 therapy approaches. At the end of six months of therapy, each subject completes a depression invent

One Way ANOVA: Degrees of Freedom

Item 1.5 Consider an experiment with three groups, with seven values in each. a). How many degrees of freedom are there in determining the-among group variations? b). How many degrees of freedom are there in determining the-within group variation? c). How many degrees of freedom are there in determining the total variat

Birds Migrating vs brain size; test group vs individual performance

One possible explanation for why some birds migrate and others maintain year round residency in a single location is intelligence. Specifically, birds, with small brains, relative to their body size, are simply not smart enough to find food during the winter and must migrate to a warmer climate where food is easily available. B

Statistics - Convenience Sampling, ANOVA Analysis

I will be conducting a convenience sample, using an electronic survey. The target population consists of approximately 143 faculty members. I will be using descriptive stats and an ANOVA analysis to measure the differences of group means (age, tenure, gender) to organizational resistance. I need to write my setting and sample in

Power Tool manufacturer assessment of new assembly machine for cordless drills

A power tools manufacturer wants to buy a new assembly machine to make cordless drills. There are three different brands of assembly machines (AM1, AM2 and AM3) and the manufacturer has secured a test machine from the suppliers of each brand. Each machine needs an assembly worker to make the drills. The manufacturer decides to

Comparison testing for popularity of types of yogurt: One way ANOVA

A food retailer sells three types of yogurt. The retailer wishes to expand the shelf space allocated to yogurt and decides to allocate the additional space based on popularity (sales) of the type of yogurt. The retailer wants to investigate if the average sales of the three types of yogurt are significantly different from each o

Two-Way ANOVAs: Interpret the Results from the Sex X Treatment

Two-Way ANOVAs Interpret the results from the sex X treatment condition ANOVA table you are given. Make sure to report the results in the APA format and write one to two sentences interpreting the results (main effects and the interaction). Factor df SS MS F

Power Tool Manufacturer: Important information about One Way ANOVA in SPSS

See attached file. A power tools manufacturer wants to buy a new assembly machine to make cordless drills. There are three different brands of assembly machines (AM1, AM2 and AM3) and the manufacturer has secured a test machine from the suppliers of each brand. Each machine needs an assembly worker to make the drills. The ma

ANOVA & Regression Analysis for Beast Buy

You work in the shipping and logistics department for Beast Buy, an American mail order company that specializes in pet food for VERY exotic pets. Beast Buy has four warehouses/distribution centers that provide product to each of four different regions in the US; Atlanta services the southeast, Boston services the northeast, Cle

Statistics: Conducting a One-Way ANOVA

A psychologist believes that the kind of feedback a person receives about their work affects the quality of the work. You randomly assign 12 widget makers to one of three groups: positive feedback only, corrective feedback only, and no feedback. You track the number of widgets that each person makes correctly (out of 10) and obt

Hypothesis Testing - Confidence Interval - ANOVA

1. An experiment was performed to compare the abrasive wear of two different laminated materials. Twelve pieces of material 1 were tested, by exposing each piece to a machine measuring wear. Ten pieces of material 2 were similarly tested. In each case, the depth of wear was observed. The samples of the material 1 gave an av

Normal Probability & ANOVA

4. A bank has kept records of the checking balances of its customers and determined that the average daily balances of its customers is $300 with a standard deviation of $48. A random sample of 144 checking accounts is selected. What is the probability that the sample mean will be at least $296? 5. Using the standard no