Explore BrainMass

Descriptive Statistics

Hypothesis (Additional Help)

Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size. I have attached these numbers in an excel sheet. From each telephone number identified as a source, take the fourth, fifth, and sixth digits. a. Calculate the mean of the 20 samples b. Draw a histogram showing the

Predicting Price from Capacity

2. Disk drives have been getting larger. Their capacity in now often given in terabytes (TB) where 1 TB = 1000 gigabytes, or about a trillion bytes. A survey of prices for external disk drives found the following data: Capacity (in TB) Price (in $) .080 29.95 .120 35.00 .200 299.00 .250 49.95 .320 69.95 1.0 99.00

Statistical analysis relating to human resources

20. Although controversial and the subject of some recent lawsuits, some human resource departments administer standard IQ tests to all employees. The Stanford-Benet test scores are well modeled by a Normal model with mean 100 and standard deviation 16. If the applicant pool is well modeled by this distribution, a randomly sele

ANOVA Table and Null Hypothesis Testing

The attached data resulted from an experiment that utilized a completely randomized design, Complete the ANOVA table. I have attached the answer in table format as well; I want to understand how the answers were obtained and also test the null hypothesis. Treatment 1 Treatment 2 Treatment 3 3.3 5.1

Normal probability distribution of investments

An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent. On the other hand, the firm reports that the yearly returns on tax-free municipal bonds are approximately normally distributed with a mean retur

Small Business Index Survey

Chapter 3 18 The U.S. Fish and Wildlife Service plans to study the fishing industry around Saginaw Bay. To do that, they decide to randomly select 5 fishing boats at the end of a randomly chosen fishing day and to count the numbers and types of all the fish on those boats. a) what kin

ANOVA Study on Egg Housing Systems

A study of four different types of egg housing systems was performed. The four egg housing systems were cage, barn, free range, and organic. In addition to housing system, the researchers also determined the weight class (medium or large) for each sampled egg. The data on whipping capacity (percent overrun) for the 28 sampled e

Statistics Data Set

1. The following data set represents the repair costs (in dollars) for a random sample of 30 dishwashers. 41.82 52.81 57.80 68.16 73.48 78.88 88.13 88.79 90.07 90.35 91.68 91.72 93.01 95.21 95.34 96.50 100.05 101.32 103.59 104.19 105.62 111.32 117.14 118.42 118.77 119.01 120.70 140.52 141.84 147.06 (a) Find the point esti

Calculating house prices with sample statistics

Hi, I want the answers for: 1-The mean price of new homes from a sample of houses is $155,000 with a standard deviation of $15,000. The data set has a bell-shaped distribution. Between what two prices do 95% of the houses fall? Refer to the sample statistics of Exercise 5 and use z-scores to determine which, if any, of th

Normally Distributed Grades

See the attachments. Exercises 2.16, 2.20, 2.24, 2.26 (b, d) Exercises 4.10 (a,d), 4.14, 4.20, 4.24, 4.32, 4.42, 4.50.

Surveys, sampling method and categorical data

Chapter 3 & 4 Sample Problems Chapter 3 5. GFK Roper Consulting conducts a global consumer survey to help multinational companies understand different consumer attitudes throughout the world. In India, the researchers interviewd 1000 people aged 13-65 . Their sample is designed so that they get 5

calculating probability and checking independence

Chapter 7 Sample Problems 41. A company has recently replaced their e-mail server because previously mail was interrupted on about 15% of workdays. To see how bad the situation was, calculate the probablity that during a 5-day work week, there would be an e-mail interruption. A) On Monday and again on Tuesday?

Relationship: Correlations and Regressions

Your final project entails systematic extraction of decision-aiding insights from a dataset (SampleDataSet.xlsx) provided to you in the Doc Sharing area. The goal of this project is to provide you with hands-on experience in conducting and interpreting different types of statistical analysis. The focus of your analysis will be o

Statistics -savings rates in the US

The significant decline of savings in the United States from the 1970s and 1980s to the 1990s and 2000s has been widely discussed by economists (, June 30, 2010). According to the Bureau of Economic Analysis, the savings rate of American households, defined as a percentage of the disposable personal income, was 4.20

The solution gives detailed discussion on a study using Chi Square test.

Describe a study you might design that could use the Chi Square statistic. What are the variables? What are the null and alternative hypotheses? Why would the Chi Square test be appropriate for this design? What would the Chi Square statistic indicate in relation to your research question? What would it not indicate? Be specific

T-Test for Dependent Groups

See the attached file(s). Questions: t-test for dependent groups 1. What are the two groups whose results are reflected by the t ratios in Tables 2 and 3? 2. Which t ratio in Table 2 represents the greatest relative or standardized difference between the pretest and 3 months outcomes? Is this t ratio statistically signi

Statistics Pitfalls

Explain/discuss each pitfall and how it might impact good problem solving in the business environment. 1. Making conclusions about a large population from a small sample 2. Making conclusions from nonrandom samples 3. Attaching importance to rare observations 4. Using poor survey methods

Data Collection Methods Vs Data Sources

Would you please explain to me the difference between data collection methods and Data Sources? -Please site examples from the attached article? -What were the data collection methods used in the article? -What were the data sources used in the article? -What are the threats to the collection methods used? -What are th

Five Statistics Probability Questions

1) An oil change shop advertised to change oil within 20 minutes. Based on the data collected on five days of work, what is the probability that oil change will take less than 20 minutes? Based on the data, do you think the business claim is valid? Explain why or why not. If not, what advertising claim could you make based upon

Identifying Hypotheses and Statistical Analyses

Practical Application Scenario 1 You are the manager of the Gander Mountain store in Frogtown, Illinois. Recently, a customer mentioned that they believed your prices for ammunition were lower than the prices of Gander's primary competitor in the hunting equipment market, Cabela's. You would like to be able to include that stat

Proper usage of the one-way, repeated measures, and factorial ANOVA

Find three research studies of interest to you that provide proper usage of the one-way, repeated measures, and factorial ANOVA. State the null hypothesis that was tested in each study. Interpret the F statistic for each study and make a determination regarding the null hypothesis (reject or fail to reject). Comment further o

Measure of central tendency and dispersion

Measure of central tendency and dispersion allow researchers to analyze data more effectively. A quick serve restaurant chain commissioned a research study on the introduction of a new salad product. The survey asked the respondent for an assessment of the new salad. The questions included a rating from 0 (lowest) to 10 (highest

Discussion on ANOVA, t test and F test

Below are a list of questions that I find particularly interesting to get some basic fundamentals down. There does not need to be much detail into any of these questions, just enough information to suffice the question (i.e. maybe a couple of sentences or key points). What is an ANOVA? Why is it called ANOVA (Explain the bas