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# Hypothesis Testing

### Likelihood of Fraud in a Furniture Retailer Fire

See attached data file. A wholesale furniture retailer stores in-stock items at a large warehouse located in Tampa, Florida. In early 1992, a fire destroyed the warehouse and all the furniture in it. After determining the fire was an accident, the retailer sought to recover costs by submitting a claim to its insurance company

### Hypothesis Testing & Confidence Interval: yield of corn

Bushels of Corn Crop researchers plant 15 plots with a new variety of corn. The yields in bushels per acre are: 138.0 139.1 113.0 132.5 140.7 109.7 118.9 134.8 109.6 127.3 115.6 130.4 130.2 111.7 105.5 Assume that the standard deviation of the population is known to be σ = 10 bushels per acre QUESTIONS: 1. Wh

### Research question: At &#945; = .01, is degree of certainty independent of credits earned?

15.18 Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major. Research question: At &#945; = .01, is the degree of certainty independent of credits earned? Certainty Credits Earned Very Uncertain Somewhat Cer

### Statistics: test whether relaxation training affect number of chronic headaches?

A researcher would like to determine if relaxation training will affect the number of headaches for chronic headache sufferers. For a week prior to training, each participant records the number of headaches suffered. Participants then receive relaxation training, and for the week following training the number of headaches is aga

### Elementary Statistics for Null and Alternative Hypothesis

Elementary Statistics 1. A researcher knows that the population mean among college students taking the social test is a "neutral" 100. (scores higher than 100are assumed to represent more conformity than average and those lower than 100 indicates less conformity). A random sample of 30 students was selected, and the followin

### Statistics: Multiple Regression for a Data Set

See file attached. Using the Major League Baseball Data Set available through the "Data Sets" link on your page, answer the research question of whether the number of wins of a team can be explained linearly by The Size of Stadium, ERA, and Stolen Bases. What I need to do is describe and perform multiple regression

### Develop Null and Alternative Hypotheses .

The data on the next sheet are from a month of order corrections at Company A. The company is concerned because there are so many order corrections and they seem to be loosing money every time that they correct an order. The process improvement team collected the following data on the Detail sheet ... (Excel document attached

### Hypothesis Testing Questions: T-Test and ANOVA

1. What does it mean practically when we say that we found a significant difference between two groups using a t-test? 2. Describe a business situation where you would want to use a t-test. Why would you choose that test? What would you expect to show by doing this? 3. Describe a business situation where you would wan

### Statistics: Hypothesis Testing, Normal Disributions, and Z Scores

Problem 1 - According to the Coffee Research Organization, the typical American coffee drinker consumes an average of 3.1 cups per day. A sample of 12 senior citizens ... Problem 2 - An investigation of the effectiveness of an antibacterial soap in reducing operating room contamination resulted in the accompanying table. The n

### Hypothesis Testing: Mean Chicken Weight

In Graph Form: Raising chickens in commercial chicken farms is a growing industry, as there is a shift from red meat to more white meat. New Jersey Red Chickens are a favorite chicken and the Feed is Us company has a new chicken food that they claim is excellent for increasing weight and naturally it costs more. You have h

### SPSS Problem

Please complete each one of the following three questions. 1. Andy's Ice Cream Shop is located in a very warm part of Texas. You collect data about the number of gallons of ice cream sold and the temperature outside (in Celsius): Day Ice Cream Sales (gallons) Ave Temp (C) 1 100 10 2 132 16 3 140 20 4 213 24 5 180

### Statistics: Weigh in on the dispute between MSF and AAP with tests and conclusion

The following information is for Questions 1 through 6.     The recommended daily allowance (RDA) of cobalamine (Vitamin B12) for growing teens is 2.4 µg (micrograms).  My brother takes it upon himself to make sure that everyone get the message.  It is generally believed that growing teens are getting less than the RDA

### Statistics: dice probabilities, 3 types of surveys, source of error, intervals, samples

1. I roll a dice five times... What is the probability that I roll five '4s'? 2. Name three types of survey, providing a one line description of when such a survey might be carried out 3. What potential sources of error might we be concerned about when conducting a survey...? Name three, providing an example for each. 4. Nomi

### Statistics: Test hypothesis that students who finish an exam first get better grades

To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of

### Statistics: Does Lovastatin (a cholesterol-lowering drug) reduce the risk heart attack?

Does Lovastatin (a cholesterol-lowering drug) reduce the risk of heart attack? In a Texas study, researchers gave Lovastatin to 2,325 people and an inactive substitute to 2,081 people (average age 58). After 5 years, 57 of the Lovastatin group had suffered a heart attack, compared with 97 for the inactive pill. (a) State the

### Statistics Dallas Fire trucks: did yellow trucks have a significantly lower accident rate?

In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At &#945; = .01, did the yellow fire trucks have a significantly lo

### Statistics: Z score, Chi square, and the Mystery analysis

See attached file. I need help with only three tabs: z score tab, chi square tab, and the mystery analysis tab

### Statistics: Testing Claims

Please see the attached file. Use the M&Ms® data to complete this assignment. You will be using the methods of 7.4 for the color proportions and 7.2 for the mean total number of candies per bag. For the Bonus you will be using the methods of 7.5. You may submit your answers in Excel, Word or pdf format. Be sure to state

### Statistics: Hypothesis testing for an oxygenated motor fuel

Two different formulation of an oxygenated motor fuel are being used to study their road octane numbers. The variance of road octane number for formulation 1 is 1.5 and for formulation 2 is 1.2. The random sample size for formulation 1 is 15 and for formulation 2 is 20 are rested, both from normally distributed populations. The

### Statistics problem

Hello. I am doing my regular homework assignment and I cannot figure out and understand how to solve some of the problems. The book that I have does not explain or show how to solve the specific problems below. I have answered the questions that I am able to, but I cannot answer the other ones no matter how hard I have tried. Ca

### Regional commuter airline: Is there a positive association between the two variables?

A regional commuter airline selected a random sample of 25 flights and found that the correlation between the number of passengers and the total weight, in pounds, of luggage stored in the luggage compartment is 0.94. Using the .05 significance level, can we conclude that there is a positive association between the two variables

### Hypothesis Testing and Differentiating Between Samples

Questions: 1. When would you use a one- or two-sample hypothesis test? Provide examples. 2. What are the differences between dependent and independent samples? Provide examples.

### Statistics: Oh Baby! Gifts goal of processing 95% of orders on the same day as received

9.62 The Web-based company Oh Baby! Gifts has a goal of processing 95 percent of its orders on the same day they are received. If 485 out of the next 500 orders are processed on the same day, would this prove that they are exceeding their goal, using &#945; = .025? (See story.news.yahoo.com accessed June 25, 2004.)

### Statistics: coin flipped 60 times. Calculate the p-value and interpret it.

9.56 A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.

### Statistic Problems: Hugger, St. Luke's, sports magazine, weight control, NDB Electronic

1. Hugger Polls contends that an agent conducts a mean of 53 in-depth home surveys every week. A streamlined survey form has been introduced, and Hugger wants to evaluate its effectiveness. The number of in-depth surveys conducted during a week by a random sample of agents are: 53 57 50 55 58 54 60 52 59 62 60 60 51 59 56

### Testing Equality of the Means of Two Populations

Find a dataset: approximately 30-100 scores or observations. Write a null and alternative hypothesis, conduct a statistical significance test (in SPSS or Excel), and tell what decision you'd make about the null hypothesis, and why. You'll need to include your SPSS or Excel output.

### Evidence needed to reject the Null Hypothesis

To extend the analogy even further--the evidence needed to reject the presumption of innocence is guilt beyond a reasonable doubt. The evidence needed to reject the null hypothesis is an inferential statistical result that is very unlikely to have occurred by chance alone (i.e., less than 5 times out of 100, or p<.05).

### Population defective rate for cell phone factory

Given the following situation, how would you use Megastat to test whether the population defective rate is greater than 5%? Please outline the process for the test and, if necessary, including the output from Megastat to explain your approach. What assumption do you need to check to make sure that the analysis is valid. "A ra

### Two or More Sample Hypothesis Testing Paper

Develop one business research question from which we will formulate a research hypothesis that will test two or more populations. Note: Kindly recommend the research question based on the database. We need to do the following: o Formulate both a numerical and verbal hypothesis statement regarding your research issue

### Significance Level

The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies. He selects a sample of 15 families, some with only a single insured driver, others with several teenage drivers, and pays each family a stipend to contact the two companies and ask for a pric