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# Hypothesis Testing

### Stating Alternative and Null Hypotheses

The breaking strengths of cables produced by a certain company are approximately normally distributed. The company announced that the mean breaking strength is 2140 pounds. with a standard deviation of 183 . A consumer protection agency claims that the actual standard deviation is higher. Suppose that the consumer agency wants t

### Finding the Null and Alternative Hypotheses

Determining null and alternative hypotheses A recent article in a university newspaper claimed that the proportion of students who commute more than 15 miles to school is no more than 25% . Suppose that we suspect otherwise and carry out a hypothesis test. State the null hypothesis H

### Formulating the null and alternative hypotheses.

Determining null and alternative hypotheses A recent article in a university newspaper claimed that the proportion of students who commute more than miles to school is no more than 25%. Suppose that we suspect otherwise and carry out a hypothesis test. State the null hypothesis and the alternative hypothesis that we would

### Forecast Analysis

Problem 1 Do the Problem and answer all the questions. Hint for question (c): Compare the errors on the basis of the Mean Absolute Deviation (MAD)? a) Develop forecasts for period 5 through 10 using 4-month moving averages. Problem 2 Do the problem and answer all the questions. Hint for question: Compare the errors o

### What is its self-supporting growth?

Bannister Legal Services generate \$2,000,000 in sales during 2010, its year-end total assets were \$1,500,000. Also, at year-end 2010, current liabilities were %500,000, \$2,000,000 note payable, \$200,000 of accounts payable, and \$100,000 of accurals. Its profit margin will be 5%, and its payout ratio will be 60%. How large a sale

### Hypothesis Testing Quantitative Analysis

Use the Wealth Score column to answer two questions: 1) Are married people wealthier than single people? Are people over 55 years old wealthier than people under 55? Do the t-test. First check for equal variances using the F-test. Use the appropriate t test, depending on the outcome of the variance test. That is if the variances

### Problems involving hypothesis testing

one-sample hypothesis test using Megastat. The mean arrival rate of flights at O'Hare Airport in marginal weather is 195 flights per hour. To increase arrivals, a new air traffic control procedure is implemented. In the next 30 days of marginal weather the following arrival rates were obtained 210, 215, 200, 189, 200, 213

### Null and Alternative Hypotheses of Average Age

The average age for all medicare patients in the USA is 75. A sample from a clinic shows that the average age of the clinic medicare patients is 78. a. what are the null and alternative hypotheses to test if the average age of the clinic mediare patients is significantly different from the national aveage? b. suppose you f

### Try to understand How McNemar's Test for Matched Pairs works.....

Testing a treatment in the article "eradication of Small Intestinal Bacterial Overgrowth Reduces Symptoms of Irritable Bowel Syndrome" (pimentel, chow and Lin, American Journa of gastroenterology, VOl 95, No 12), the authors include a discussion of whether antibiotic treatment of bacteria overgrowth reduces intestinal complaints

### Hypothesis Testing of Proportions..

awson and Jick [1976] compare drug prescription in the United States and Scotland. (a) In patients with congestive heart failure, two or more drugs were prescribed in 257 of 437 U.S. patients. In Scotland, 39 of 179 patients had two or more drugs prescribed. Test the null hypothesis of equal proportions giving the resulting p-

### Non-Significant Results in Research

Supposing that I formulate a hypothesis and conduct an experiment, but the results were not significant. Is it possible to gain information from that or has my experiment been a failure? Can you enlighten me on this and also provide me with examples to support the argument.

### Reflection Project Undertaken

Discuss a recent research project undertaken in the last 3 to 5 years. What type of analysis was conducted? What decisions were made? How can you apply hypothesis testing at your place of work or another similar setting? Can you identify a situation within your workplace or community where hypothesis testing could be used?

### Statistics

Need assistants in understand how to calucate in order to arrive at the correct answer. I am having issues arrive to the correct answer.

### RES/341

Citrus Rental is a popular car rental agency that has a history of having too few cars available, so that its available cars are overdriven. The mean monthly mileage over the years for Citrus cars has been about 1600 miles per month. Recently, though, Citrus purchased thousands of new cars, and the company claims that the avera

### Applied Statistics: Health Care Professionals

A hypothesis could be that the rate of teenage crime (13-19 year olds) 50 years ago in the United States was significantly lower than the rate of teenage crime is today. What would be the contrary viewpoints to the proposed hypothesis which would make it void? What is your position on this?

### Null, Alternate Hypothesis, Alpha, Test Statistic Help

Please assist with this problem and step-by-step show me how to solve it. I don't want just answers, I want to learn how to solve these problems. Your help is appreciated. (If you know the technique on how to solve in MegaStat and could use that as your step by step that would be awesome as I cannot figure that program out but i

### Hypotheses Testing Error Types

QUESTION 1 A study conducted in March 2009 found that about half of U. S. adults trusted the U. S. government more than U. S. business to solve the economic problems of the United States. However, when the population is subdivided by political party affiliation, the results are very different. The study showed that 72% of Demo

### Statistical Analysis in SAS

See attached files. For this assignment, you will use the two attached dataset files. You will read a comma delimiter file into SAS and list the contents of the SAS dataset, replacing missing values. The following steps are necessary to complete this assignment: 1. Read a csv (comma delimiter) file into SAS and list t

### Hypothesis test for amounts paid into private pension funds

A sample of 87 professional working women showed that the average amount paid into private pension fund per person, per year, was \$5,152, and that the population standard deviation is \$1,100. A sample of 76 professional working men showed that the average amount paid into a private pension fund per person, per year was, \$5,727,

### Test hypothesis for percentage of accounting firms that offer flexible scheduling

A study by Hewitt Associates showed that 79% of companies offer employees flexible scheduling. Suppose a researcher believes that in accounting firms this figure is lower. She randomly selects 45 accounting firms and determines that 303 of these firms have flexible scheduling. Test the researcher belief at a 1% level of sigifi

### Hypothesis Test for the Average Income of a Sold Proprietor CPA

A ten year old survey found that the average income of sole proprietor CPA's was \$74,914. To update this information, a new survey of 112 proprietor CPA's was taken and it showed a mean of \$74,695. Use a 5% level of significance to test whether the average income sole proprietor CPA's has increased. Assume a population standard

### Linear regression, p-value and test statistic

Bay area community college (BACC) has collected data comparing the starting salaries of their graduating students with last names beginning with the letters A through M with those whose last names begin with N through Z. The first categorty provided 47 random responses with an average starting salary of \$29,426.42 and a standard

### Two-Sample Tests and Evidence

A teacher claims that a grammar seminar will help students reduce the number of grammatical errors they make when writing a 1000-word essay. The table shows the number of grammatical errors made by seven students before participating in the seminar and after participating in the seminar. Student 1 2 3 4 5

### You conducted a study to examine the relationship between party affiliation and gender. You find the following: Democrat Republican Independent Male 52 65 20 Female 88 52 35 Are sex and party affiliation related? Report the appropriate null and research hypotheses and the critical value (alpha = 0.05). In addition, provide your statistical conclusion, including calculation of test statistic and what the data suggests in one to two sentences.

Assignment 2: Chi-Square Analysis You conducted a study to examine the relationship between party affiliation and gender. You find the following: Democrat Republican Independent Male 52 65 20 Female 88 52 35 Are sex and party affiliation related? Report the appropriate null and research hypotheses and the

### need help on these problems

1. Consider the hypothesis test given by ho: m=50 h1: m=>50. in a random sample of 100 subjects, the sample mean is found to be xbar = 53.4. also the population standard deviation is sigma= 8 Determine the p-value for this test. is there sufficient evidence to justify the rejection of ho? explain. 2) We perform t

### Test a manufacturer's claim that defective machines

A PC manufacturer claims that no more than 2% of their machines are defective. In a random sample fo 100 machines, it is found that 5 percent are defective. The manufacturer claims this is a fluke of the sample. At a 0.01 level of significance, test the manufacturer's claim and explain your answer. Test and CI for One Propor

### Statistics regression anaylsis, Ho and null hypothesis

How do I determine sleep affect on GPA or is something else affecting grades as much, using statistics? Background There have been various studies that say students' grades are affected by poor diet, high amounts of stress, lack of sleep, and excessive alcohol use. Perhaps one of the most important factors out of those ment

### Statistics of SPSS 2004GSS.sav data file

Crosstabulation: Examine variables in the "2004GSS.sav" data file. Choose one from the following three variables to be the dependent variable in the hypotheses you will establish. a. Grass b. Fear c. Gunlaw Choose another variable from the data

### Statistical Tests: Hypotheses, Critical Region, and P-Value

Let p equal the proportion of drivers who use a seat belt in a country that does not have a mandatory seat belt law. It was claimed that p = 0.14. An advertising campaign was conducted to increase this proportion. Two months after the campaign, y = 104 out of a random sample of n = 590 drivers were wearing their seat belts. Was

### Statistical Inference: Support conclusion of no difference in the proportion of men and women who think weight is a factor in purchasing a laptop

According to a study conducted by Ace Computers, 59% of men and 70% of women say that weight is an extremely/very important factor in purchasing a laptop computer. Suppose this survey was conducted using 374 men and 481 women. Do these data show enough evidence to support the conclusion that there is no difference in the proport