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 α = .01, is the degree of certainty independent of credits earned? Certainty Credits Earned Very Uncertain Somewhat Cer
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 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
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
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
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
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
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
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
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
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
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
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
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 α = .01, did the yellow fire trucks have a significantly lo
See attached file. I need help with only three tabs: z score tab, chi square tab, and the mystery analysis tab
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
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
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
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
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.
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 α = .025? (See story.news.yahoo.com accessed June 25, 2004.)
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.
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
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.
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).
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
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
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
Grand Strand Family Medical Center is specifically set up to treat minor medical emergencies for visitors to the Myrtle Beach area. There are two facilities, one in the Little River Area and the other in Murrells Inlet. The Quality Assurance Department wishes to compare the mean waiting time for patients at the two locations.
38. A recent article in The Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30-year rates (in percent): 4.8 5.3 6.5 4.8 6.1 5.8 6.2 5.6 At the .01 significance level, can we conclude that the 30-year mortgage rate