Explore BrainMass

Hypothesis Testing

Hypothesis Testing for Variable Data

Perform hypothesis testing on one variable's data. (Choose either the intrinsic or extrinsic column.) Perform a t-test by formulating a null and an alternative statement, choosing an acceptable significance value, determining the appropriate critical value, selecting the test statistic and determining its value from the sample d

The Mean Waist Size for Males

To test the null hypothesis that the mean waist size for males under 40 years equals 34 inches versus the hypothesis that the mean differs from 34, the following data were collected: 33, 33, 30, 34, 34, 40, 35, 35, 32, 38, 34, 32, 35, 32, 32, 34, 36, 30. Calculate the t* -value of the test statistic. State the null hypoth

Level of significance and proportion

Some defendants in criminal proceedings plead guilty and are sentenced without a trial, whereas others who plead innocent are subsequently found guilty and then are sentenced. In recent years, legal scholars have speculated as to whether sentences of those who plead guilty differ in severity from sentences for those who plead i

The Truth of the Null Hypothesis

When we reject the null hypothesis, we are certain that the null hypothesis is false? Yes or No? And, If our decision in a hypothesis test is to fail to reject the null hypothesis, then we know that the null hypothesis must be true? Yes or No?

Population Variance for Maintenance Supervisors

A maintenance supervisor is comparing the standard version of an instrunctional booklet with one that has claimed to be superior. The experiment is conducted in which 26 technicians are divided into two groups,provided with one of the booklets, then given a test a week later. For the 13 using the standard version, the average ex

Hypothesis identification analysis article:

Hypothesis Identification Article Analysis In the Online Collection, and the key search words "research studies in" to obtain an article. You can select communication, finance, economics, marketing, technology, or other faculty approved topic for the research study. Prepare a 350-700-word analysis of your selected article

Conduct the equivalent, non-parametric test of hypothesis

I am to determine whether the baseball players salary affects wins. I attached my full file below. Please let me know if i am missing an information. According to the current Collective Bargaining Agreement, the minimum salary for a Major League Baseball player will be $390,000 in 2008 and the maximum salary in 2008 will be $

Measurement scale types, test stats, probability

A: Which of these measurement scales (nominal, ordinal, interval and ratio) can be handled through hypothesis testing? B: What are the five steps in hypothesis testing? Is the order important? Why or why not? C: Just what do we mean by "test statistic"? D: Why do null and alternative hypotheses have to be mutually excl

Real world statistics example

Could you please send me an example of a real-world situation or problem addressing the independent and dependent variables study; that includes a research question; the statistical null and alternative hypotheses; an explanation of why this test is appropriate and why a parametric procedure, such as correlation or APA format.

Test Value for manufacturing flashlight batteries

A manufacturer of flashlight batteries took a sample of 13 batteries from a day's production and used them continuously until they failed to work. The life lengths of the batteries, in hours, until they failed were: 342, 426, 317, 545, 264, 451, 1049, 631, 512, 266, 492, 562, and 298. At the .05 level of significance, is

Test Value - Criminal Proceedings

Some defendants in criminal proceedings plead guilty and are sentenced without a trial, whereas others who plead innocent are subsequently found guilty and then are sentenced. In recent years, legal scholars have speculated as to whether sentences of those who plead guilty differ in severity from sentences for those who plead i

Hypothesis testing on low-frequency data

Indoor natatoriums or swimming pools are noted for their pool acoustical properties. The goal is to design a pool in such a way that the average time that it takes a low-frequency sound to die is at most 1.3 seconds with a standard deviation of at most .6 seconds. Computer simulations of a preliminary design are conducted to see

Testing Hypothesis with P-Value

A statistician was testing the following hypotheses: Ho: μ = 500 vs. Ha: μ ≠ 500. The p-value approach was to be used. A sample of size 49 gave a sample mean of 508. Given that σ = 30 2, and α = 0.01, find the p-value, and write your conclusion.

Hypothesis formulation

How can I say numerically( equation) that: Alternative Hypothesis: If an individual has 12 or more years of education their salaries will be higher. Null : years of education is not a factor in salaries.

Hypothesis test/classical approach

The problem: In Meijer supermarket, the customer's waiting time to check out is approximately normally distributed with a standard deviation of 2.5 minutes. A sample of 25 customer waiting times produced a mean of 8.2 minutes. Is this evidence sufficient to reject the supermarket's claim that its customer checkout time averag

Research on Ulcer Treatment

Suppose that research doctors wish to know if penicillin is an effective treatment for ulcers. They plan to search hospital records for patients with ulcers and then randomly select two groups: a group which happened to have been given penicillin and another group which was never given penicillin. State whether comparing these t

Bonferroni Correction

The question is what is the Bonferroni correction? When is it used? What is the principle of the Bonferroni correction? What are planned comparisons? Why do researchers making planned comparisons need to make the Bonferroni correction? If a researcher is making four planned comparisons using the .05 significance level, wh

Two or More Sample Hypothesis on real estate data

Develop two different Research Question and Two or different Statement of Hypothesis - verbal for the data set provided Research Question It should be one sentence, testable, and traditionally written with the dependent variable followed with the independent variable (if applicable.) Length: One sentence. Statement of Hy

Hypothesis testing procedures and test classifies

What hypothesis testing procedure would you use in the following situations? Explain your reasons, including assumptions and limitations for selecting the procedure. A test classifies applicants as accepted or rejected. Based on 200 applicants, test the hypothesis that ad placement success is not related to gender. A comp

Two or more sample hypothesis testing formulation

Using numerical data from one of the data sets available through the "Data Sets" link on your page, develop one business research question from which you will formulate a research hypothesis that will test two or more populations. Formulate both a numerical and verbal hypothesis statement regarding your research issue. T

Process of Hypothesis Testing and Outcomes

Discuss the process of the hypothesis testing and the outcome. Give feedback and highlight two areas of significance. Give pros and cons of the hypothesis and the outcome.

Probability of randomly selecting shafts

Problem 1 Mutual funds have become an increasing popular investment alternative for smaller investors. To help investors decide on the particular fund to invest in, various publications regularly report the average annual rate of return achieved by each of more than 100 mutual funds over a 10 year period. Some publications also

Hypothesis ...

A typical college student spends an average of 2.55 hours a day using a computer. A sample of 13 students at The University if Findlay revealed the following number of hours per day using the computer: 3.15 3.25 2.00 2.50 2.65 2.75 2.35 2.85 2.95 2.45 1.95 2.35 3.75 Can we conclude that the mean nunmber of hou

Statistics - Hypothesis Testing..

The mean construction time for a standard two-car garage by Arrowhead Construction Company is 3.5 days. The time for the construction process follows the normal distribution. The construction process is modified through the use of "precut and asembled roof trusses" rather than onsite construction of roof rafters. This should sho

Significance Level of Government Center Building Entrances

There are four entrances to the Government Center Building in downtown Philadelphia. The building maintenance supervisor would like to know if the entrances are equally utilized. To investigate, 400 people were observed entering the building. The number using each entrance is reported below. At the .01 significance level, is the

Hypothesis testing and value of test statistic

The mean cleanup and redecorating time for a one-bedroom student apartment at campus Housing is 16 hours. The time for the cleanup and redecorating process follows the normal distribution. The campus Housing administration instituted a "fee and fine system" that encourages students to clean their apartments when they vacate them

Methods of Computation for Significance

A personnel psychologist studying adjustment to the job of new employees found that employees' amount of education (in number of years) predicts ratings by job supervisors two months later. The regression constant in the linear prediction rule for predicting job ratings from education is 0.5 and the regression coefficient is

Methods of computation and quantitative ability

A person scores 81 on a test of verbal ability and 6.4 on a test of quantitative ability. For the verbal ability test, the mean for people in general is 50 and the standard deviation is 20. For the quantitative ability test, the mean for people in general is 0 and the standard deviation is 5. Which is this person's stronger abil

Statistics - Hypothesis Testing...

A student group claims that first year students at a college study an average of 150 minutes per night. A skeptic suspects that the students actually study less. A survey of 269 math students results in an avery of 137 minutes. Write the null and alternative hypothesis. The average of 137 minutes was found to be statisti