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Hypothesis Testing

Case Study Regression Equations

See the attached file. The case study is a written report, and it should include an introduction, your responses to the questions being asked, and a conclusion. Remember, the case study is more than just a collection of Excel output, and it should be written in complete, grammatically correct sentences. You should submit two

House Pricing and Resale Value Problems

The national median sales price for new single-family homes is $230,000 (The Associated Press, March 25, 2006). Assume that the following data were obtained for sales of existing single-family homes in Houston and Boston. Greater than $230,000 Equal to $230,000 Less than $230,000 Houston 11

Cholesterol Statistics

You work as a consultant for a firm that specializes in workplace health. You have recently been put on a team that has been hired by a company with 80 employees, half men and half women that are considering instituting an employee wellness program as they have specific concerns over obesity and cholesterol levels among their e

Hypothesis Test for the Correlation Coefficient R

For the accompanying data set (a) draw a scatter diagram (b) compute the correlation coefficient rounded to three decimal places and (c) determine rather there is a linear relation between x and y Data Set x 2 6 6 7 9 y 8 7 6 9 5

Statistics Data

The following data (in pounds), which were selected randomly from a normally distrubuted population of values, represent mearsurements of a machine part that is supposed to weigh, on average, 8.3 pounds. Total sample: 20 Use the data at alpha = .01 to test the hypothesis that the parts average 8.3 pounds. 8.1, 8.4, 8.

Statistical inference: Gander Mountain store in Frogtown, IL

Scenario 1 The manager of the Gander Mountain store in Frogtown, IL, believes that his prices for ammunition are lower than the prices of his primary competitor in the hunting equipment market, Cabela's. He would like to be able to provide evidence to support this assertion. - What are the Gander Mountain manager's null and al

Research Methods

You are a research analyst with a large research and development firm, Akron Research. Your firm performs studies and analysis for companies that need product, process improvement, manufacturing, and consulting research services. You have been assigned to develop a comprehensive research strategy and plan and develop a propo

Biostatistics: Clinical trials

The table below summarizes baseline characteristics on patients participating in a clinical trial. a) Are there any statistically significant differences in baseline characteristics between treatment groups? Justify your answer. b) Write the hypotheses and the test statistic used to compare ages between groups. (No cal

ChiSquare, Regression, Etc

Question 1 A goodness of fit test is to be performed to see if Web Surfers prefer any of four Web sites (A, B, C and D) more than the other three. A sample of 60 consumers is used. What is the expected frequency for Web site A? 1/4 20 15 10 30 Question 2 A variable contains five categories. It is

Hypothesis Testing using Z Test for Proportion

Professor Jennings claims that 35% of the students at Flora College work while attending school. Dean Renata thinks that the professor has underestimated the number of students with part time or full time jobs. A random sample of 81 students shows that 39 have jobs. Do the data indicate that more than 35% of the students have jo

Null, t-score, pvalues

One of the most commonly used statistical techniques is the comparison of two means, also known as the t-test (for this you need quantitative, or interval level data). If you used the same data to compare means with equal sample sizes, how would the results compare if you used the paired sample, independent sample equal varianc

Ioccurrence of presenile dementia and a family history

A case-control study of presenile dementia identified 176 clinically diagnosed patients aged below 65 years from hospital records. Each case was individually paired with a community-sampled control of the same sex and age. Steps were taken to ascertain that each of the controls did not suffer from dementia. One of the risk fa

The Association Between PIR and Plasma Amphetamine Level

See the attached file. In a study of the relationship between amphetamine metabolism and amphetamine psychosis, twenty habitual amphetamine users were tested and given a psychosis intensity rating (PIR). Plasma amphetamine levels (mg/ml) were also measured for these patients. The data is summarized in the table below. The

Comparing the concentrations of two types of aspirin

One method for assessing the bioavailability of a drug is to measure its concentration in blood and/or urine samples at certain points in time after administering the drug. Suppose we want to compare the concentrations of two types of aspirin (types A and B) in urine samples taken from the same person, 1 hour after he or she ha

The Association Between Maternal Age and Birth Weight

See the attached file. A small pilot study is being conducted to determine the association between maternal age and birth weight. First, from all the single births in 2009 at Hospital X with mothers aged less than or equal to 20 years, we randomly selected 15 records. We also selected randomly 17 records from all the sing

Statistical Significance

Discuss the concept of statistical significance, including your understanding of what it means, why it is important, and how it can be used.

Statistics Case Study Problem

A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them a questionnaire about their attitudes. The mean score on the questionnaire for these 36 students i

Null Hypothesis: Paranormal Researcher

A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.

Reject or Fail to Reject the Null Hypothesis

A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them a questionnaire about their attitudes. The mean score on the questionnaire for these 36 students i

Treaded Discussion

Examples of Six Sigma Tools for Statistical Significance. Cite an example of your experience with applying Six Sigma tools for Statistical significance in the workplace. If you do not have an actual example, suggest a situation or context in which the tools would provide valuable quality improvement help. Use the classic que


Harris, Schoen, and Hensley (1992) conducted a research study showing how cultural experience can influence memory. They presented participants with two different versions of stories. One version contained facts or elements that were consistent with a U.S. Culture and the second version contained material consistent with a Mexic

Hypothesis Testing for tap vs. bottled water

I conducted a hypothesis testing on bottled water vs tap water. I had one participant and 30 trials over a period of 3 days. The subject successfully identified tap vs water 14 times. I need to know how to calculate this data using Z and p value calculations in excel (or any statistical calculation) and be able to explain the da

Baseball 2010 data

Refer to the Baseball 2010 data, which reports information on the 30 Major League Baseball teams for the 2010 season. Prepare a report on the variable team payroll that specifically addresses each of the following questions. a. Around what values do the payrolls tend to cluster? What are the mean and median of payroll? Is one

Use critical value to evaluate the null hypothesis

Choo Choo Paper Company makes various paper products. One of their products is a 30 mils thick paper. In order to ensure that the thickness of the paper meets the 30 mils specification, random cuts of paper are selected and the thickness of each cut is measured. A sample of 64 cuts had a mean thickness of 30.3 mils with a standa

Hypothesis Testing: Finding the Number of Resignations

Please help with the following statistics problem. Please provide step by step calculations in Excel. The personnel department reported 60 resignations during the last year. The following data shows the seasons in which they occurred: Season.......................Number of resignations Winter.........................10

Calculating the P-Value in Excel Based on the Null hypothesis T-Test

A major manufacturer of golf equipment seeks to improve its market share by introducing a golf ball that is less likely to slice when hit. The company's research and development group has been experimenting with dimple patterns that promote straight flight, and have achieved some degree of success. The vice president of marketin


1.) The following sample was obtained from a population with unknown parameters. Scores: 6, 12, 0, 3, 4 Compute the sample mean and standard deviation. (Note that these are descriptive values that summarize the sample data). Next part of question is to compute the estimated standard error for M. (Note that this is an

Multiple t test based questions

1.) A spelling test is given to random samples of size 6 from executive secretaries at each of two large insurance companies. The results (in errors/document are: Company A Company B Subject 1 5 3 2 9