Share
Explore BrainMass

Hypothesis Testing

Hypothesis Testing: Critical Values and Decision Making Problems

You will be asked to determine the correct decision (Reject Ho or Fail to Reject Ho) for each of the following tests of hypotheses. 1. A hypothesis test at the 0.025 level of significance with a p-value for the sample of 0.0075. 2. A hypothesis test at the 0.01 level of significance with a p-value for the sample of 0.012

Hypothesis Testing: Population Mean and Proportion

Does Lavastatin reduce the risk of heart attack? In a Texas Study, researchers gave Lovastatin to 2,325 people, and a inactive substitute to 2,081 people, with an average age of 58. After 5 years, 57 of the lovastatin group suffered a heart attack, compared with 97 for the inactive pill. The level of significance of the test

Statistics - Minimize Z = 1.80S + 2.20T

2) Minimize Z = 1.80S + 2.20T Subject to: 5S + 8T => 200 15S + 6T => 240 4S + 12T => 180 T => 10 S, T => 0 (a) What are the optimum values of the decision variables and Z?

The solution to Hypothesis testing of Mean: Five step method

1. Determine whether the hypothesis test for each claim is left-tailed, right-tailed, or two tailed. Explain your reasoning. Lung Cancer: A government report claims that the proportion of lung cancer cases that are due to smoking is 87% 2. Testing Claims. (a) write the claim mathematically and identify H0 and Ha. (b)

Rising FAX Costs

Chapter Exercises 9.54 Faced with rising FAX costs, a firm issued a guideline that transmissions of 10 or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44

Hypothesis Tests of Equality of means of two populations.

Data Analysis 32. Consider a random sample of 100 households from a middle-class neighborhood that was the recent focus of an economic development study conducted by the local government. Specifically, for each of the 100 households, information was gathered on each of the following variables: family size, location of th

One Sample Hypothesis Testing

Using ratio or interval numerical data from the data set attached, develop the following: 1. Develop a research question 2. Formulate a research hypothesis and null hypothesis 3. Decide the type of test and level of significance 4. Calculate the standard error 5. Find the critical region 6. Perform the hypothesis te

State your Null and Alternative hypothesis

Please state your null and alternative hypothesis for the following cases. Please explain how do you make that decision on which is alternative and which is null. Remember that it comes to the point that what a researcher would like to test for. For example, when I test to see if a sereal box weighs as it is stated, I am tes

T tests, confidence intervals

1. Explain the difference between testing a single mean, testing the difference between two means from an "independent sample" and testing mean differences from a "dependent sample". 2. Choose a variable. You will be comparing the means of two groups to each other. Your sample will consist of 12 subjects in each group. You ma

two-tail hypothesis test for the breaking strength of a certain

PROBLEM # 3 A certain type of cable was advertised as having a breaking strength of 1000 pounds. A test of XX pieces of this cable was conducted and the mean breaking strength of this sample was XXX pounds with a sample standard deviation of XX pounds. Conduct a two-tail hypotheses test at alpha = .05 to determine if this samp

Hypothesis Test

A legal researcher is studying the age distribution of juries by comparing them with the overall age distribution of available jurors. The researcher claims that the jury distribution is different from the overall distribution; that is, there is a noticeable age bias in jury selection in this area.The table shows the number of j

Hypothesis Test

1. Given the following data from two independent samples from which the population standard deviation is known, conduct a two-tailed hypothesis test to determine if the first sample mean is smaller than the second sample mean, given a 0.01 level of significance. n1 = 42 n2 = 30 xbar1= 39 xbar2 = 25 sigma1=8 sigma2 = 6

Evaluate: Five Step Testing Hypothesis

The following sample data shows the quarterly earnings in millions for two US companies. Your research interest is finding if the average earnings for these companies are different. Justify your answer by doing a five step testing of the hypothesis at the 0.05-level of significance. Show all the steps of the calculations. Com

Theoretical Issues About Testing of Population Mean

How do hypothesis-testing procedures differ for the population mean when the population standard deviation is known or unknown? What is the relationship between two-sided hypothesis tests for means and confidence intervals? Why would the population variability and the sample size affects the power of a test? How do the leve

Central Limit Theorem and its implications in Hypothesis Testin

Q1: What do you remember from the CLT and it's implications? Please touch up on them. Q2: Please explain how this theory is used in testing hypothesis. Q3: What are confidence intervals telling us? Q4: What region under the normal curve corresponds to Researcher's confidence? Q5: What are the area under the 2 tai

Testing Claims and Identification

Testing Claims (a) Write the claim mathematically and identify Ho and Ha, (b) find the critical value(s) and identify the rejection region(s), (c) find the standardized test statistic, (d) decide whether to reject or fail to reject the null hypothesis, and (e) interpret the decision in the context of the original claim.

Deciding on a Distribution

Deciding on a Distribution, decide whether you should use a normal sampling distribution or a sampling distribution to perform the hypothesis test. Justify your decision. Then use the distribution to test the claim.Write a short paragraph about the results of the test and what you can conclude about the claim. 37. Gas Mile

Hypothesis testing of Mean: Microwave Repair Costs

Testing Claims, (a) write the claim mathematically and identify Ho and Ha. (b) find the critical value(s) and identify the rejection region(s). (c) find the standardized test statistic. (d) decide whether to reject or fail to reject the null hypothesis. (e) interpret the decision in the context of the original claim. For e

MSW

5 groups 7 values in each group if ssa= 60 and sst = 210, what is SSW. A. what is MSA. B. what is msw C. what is the value of the test statistic F? A. Construct a ANOVA summary table and fill in all values in the table B. At the 0.05 level of signifance what us the upper-tail critical value from the F distribution c. St

Statistics SPSS computation and interpretation

Cooling method for gas turbines. During periods of high electricit demand, especially during the hot summer months, the power output from a gas turbine engine can drop dramatically. One way to counter this drop in power is by cooling the inlet air to the gas turbine. An increasingly popular cooling method uses high pressure i

Using and Interpreting Concepts

Using and Interpreting Concepts Testing Claims Using P-values, (a) write the claim mathematically and identify Ho and Ha. (b) find the standardized test statistic and its corresponding area. (c) find the value. (d) decide whether to reject or fail to reject the null hypothesis. (e) interpret the decision in the context of

Using and Interpreting Concepts

Using and Interpreting Concepts Testing Claims Using P-values In Exercises 33-38, (a) write the claim mathematically and identify and . (b) find the standardized test statistic and its corresponding area. (c) find the value. (d) decide whether to reject or fail to reject the null hypothesis. (e) interpret the decision in t

Statistics - Mean Life Expectency of Light Bulbs.

Please help with these questions: The Manager at a light bulb factory wants to determine whether there is any difference in the mean life expectancy of light bulbs manufactured on two different, whether there is any difference in the mean life expectancy of light bulbs manufactured on two different models of machines. The pop

Statistics

TThe public relations department of the Social Security Administration. In an effort to design better advertising campaigns, your department decides to conduct a survey to find out the opinions people in the US have about the system. One of the questions asked and the results of each respondent's age are shown to the left. Yo

Research Questions and Hypotheses

How do research questions frame studies? What type of wording would lead to a qualitative study? A quantitative one? How does a researcher determine how many hypotheses are needed for a particular study?

Research proposals, study plan, theoretical models, ethical issues

· What is the role of theory in research proposals? · What are the elements of a study plan? Where might a beginning researcher lose logical flow among elements in a study plan? Why might that happen? · What are the pros and cons of selecting an established theoretical or conceptual model or framework? What are the pros

5-step hypothesis

To help me understand 5-step hypothesis more clearly. 1. Describe a 5-step hypothesis test for two variances for a particular claim related to a real life experience. You need to state the claim, define the null and alternate hypothesis, identify the test significance and the test statistic, and state the decision rule that

Statistics: Hypothesis Testing for Mean and Variance Problem Set

1. At the time she was hired as a server at the Grumney Family restaurant, Beth Brigden was told, "You can average more than $20 a day in tips." Over the first 35 days she was employed at the restaurant, the mean daily amount of her tips was $24,85, with a standard deviation of $3.24. Can Ms. Brigden be 99% confident that

Advice on Drafting a Problem Statement

Here is the assignment: · Submit a draft of two problem statements that address current situations, issues, or observations in your field of study (Human Resources) or discipline to your individual forum. Back each of the problems with at least two recent sources from peer reviewed journals (within the past 5 years). Each p