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Hypothesis Testing

Hypothesis Test for Consensus Estimate

On Friday, Wall Street traders were anxiously awaiting the federal government's release of numbers on the January increase in nonfarm payrolls. The early consensus estimate among economists was for a growth of 250,000 new jobs (CNBC, February 3, 2006). However, a sample of 20 economists taken Thursday afternoon provided a sampl

Null hypothesis

You're trying to explain null and alternative hypotheses to one of the senior managers at Company W and he's not "getting it" when you use snack food sales. Help him by thinking about a business problem in another organization or department. Formulate a null hypothesis and the corresponding alternative hypothesis that could be t

The Role of Mental Health in Physical Health

'Does mental health play a role in physical health?' 1. Briefly remind us of the two variables in your correlation and the operational definition of each. 2. State the null hypothesis and the alternative hypothesis (be sure to clearly label each one) for your correlation. 3. Explain what it would mean if we rejected the nu

Hypothesis Testing Using One Sample

Scenario 1 The vice president of operations for a veterinary supply company has designed a new quality control process that she believes will significantly reduce the reject rate in the packing line for bottles of equine glucosamine from its historical level of 32 units per 1,000. She now wants to implement a pilot of this pr

Hypothesis Testing of Mean..

Historically the average age of European soccer players is reported as 26 years with a standard deviation of 4 years. A random sample of 81 European professional soccer players has an average age of 27 years. We would like to decide if there is enough evidence to establish that average age of European soccer players has increase

Example Hypothesis that should be tested for the attached survey

1. Please give at least 4 example Hypothesis (and NULL) that should be tested for the attached survey, and explain why? Please note the questions on the survey are based upon surrounding the following six factors: ***Uncertainty Avoidance ***Individualism vs. Collectivism ***Power Distance ***Paternalism ***Masculinity

Levels of Statistics and Null and Alternative Hypothesis

According to a recent study, when shopping online for luxury goods, men spend a mean of $2,401, whereas women spend a mean of $ 1,527. (Data extracted from R. A. Smith, " Fashion Online: Retailers Tackle the Gender Gap," The Wall Street Journal, March 13, 2008, pp. D1,D10.) Suppose that the study was based on a sample of 600 m

Hypothesis Testing & Confidence Interval Quest

Question 1: James and John want to see who catches the most fish on their fishing trips. It is hypothesized that the two brothers catch the same number of fish. James catches an average of 20 fish in 12 fishing trips with a standard deviation of 3 fish and John catches an average of 24 fish in 15 fishing trips with a standard de

Hypothesis Test Ball Technology

1. A maker of golf balls has developed a new ball technology and is interested in estimating the mean difference in driving distance for this new ball versus its existing best-seller. To conduct the test the developers selected six professional golfers and had each golfer hit each ball one time. The distances travelled were:

Statistics Case Study-D&Y Employee Retention

Sunny- I have increased the bid to 15 credits. Please ensure that you complete all work in minitab and you send me the file. If possible, please email me your word document and minitab file to [email address removed by system]. Thank you. Brad Sunny- Here is the case study and minitab data set reposted and assigne

Hypothesis Testing Problems,

Example 1: Suppose data on retail prices of a cholesterol reducing drug were collected from randomly selected Pharmacies of two states (16 pharmacies from State1 and 13 from State 2) with the following values: State 1 State2 125.05 145.32 137.56 131.19 142.5 151.65 145.95 141.55 117.49 125.99 142.75 126.29 121.99 139.19

Hypothesis test: sample of 100

Consider the following hypothesis test: HO: µ ≥ 80 Ha: µ < 80 A sample of 100 is used and the population standard deviation is 12. Compute the p-value and state your conclusion for each of the following sample results. Use a = .01. a) x = 78.5 b) x = 77 c) x = 75.5 d) x = 81

Statistics Problems

1. A chef in a restaurant that specializes in pasta dishes was experiencing difficulty in getting brands of pasta to be al dente-that is, cooked enough so as not to feel starchy or hard but still feel firm when bitten into. She decided to conduct an experiment in which two brands of pasta, one American and one Italian, were cook

Hypothesis Test: Z Test, T Test, ANOVA, Type-I and Type-II Errors

1. If you use a 0.05 level of significance in a (two-tail) hypothesis test, what will you decide if Z stat = -0.76? 2. In the U.S. legal system, a defendant is presumed innocent until proven guilty. Consider a null hypothesis, H0, that the defendant is innocent, and an alternative hypothesis, H1, that the defendant is guilty. A

Hypothesis Testing

1.An independent test agency is interested in determining whether the mean number of color pages printed using name-brand cartridges exceeds the mean number of color pages printed by generic cartridges. A random sample of 6 users were given both a name-brand cartridge and a generic cartridge and they used their printers until

Statistics Problems

1. During a natural gas shortage, a gas company randomly sampled residential gas meters in order to monitor daily gas consumption. On a particular day, a sample of 100 meters showed a sample mean of 250 cubic feet and a sample standard deviation of 50 cubic feet. The manager for the gas company believes that the company may not

Statistics Problems

1. If we have a sample size of 100 and the estimate of the population proportion is 0.10, the mean of the sampling distribution of the sample proportion is: A. 0.0009 B. 0.10 C. 0.03 D. 0.90 E. 0.09 2. When carrying out a large sample test of H0: m =10 vs. Ha: m # 10 by using a p-value, we reject H0 at level of signif

True or false questions in hypothesis testing

**A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995. True or false **If the population is normally distributed then the sample mean is also normally distributed even for small sample size. True or false **F

Conducting and Analyzing Statistical Tests

A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows: Student Anxiety Scores Study Hours 5 1 10 6 5 2 11 8 12 5 4 1 3 4 2 6 6

Hypothesis Test for Mean

A sample size of 16 was randomly drawn from a normal population. The mean of these 16 cases was 47.6875 and the sample standard deviation was 19.0883. At an alpha level of .05, does the mean of the population differ significantly from 60?

The method for conducting hypothesis testing

A leasing firm claims that the mean number of miles driven annually, u, in its leased cars is less than 13,340 miles. A random sample of 13,239 cars leased from this firm had a mean of annual miles driven. It is known that the population standard deviation of the number of miles driven in cars from this firm is 1680 miles. Assu

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

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

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-

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?


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