Chapter review questions attached. --- 1. If it is important to reject a false null hypothesis, the B probability should be: a. small b. large c. close to 1.0 d. negative e. impossible to tell? 3.. The manufacturer of a refrigerator system for beer kegs produces refrigerators which are supposed to maintain a true mean
The manufacturer of an MP3 player wanted to know whether a 10 percent reduction in price is enough to increase the sales of their product. To investigate, the owner randomly selected eight outlets and sold the MP3 player at the reduced price. At seven randomly selected outlets, the MP3 player was sold at the regular price. Re
Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution. In an effort to increase their weight, a special additive is added to the chicken feed. The subsequent weights of a sample of five-month-old chickens were (in pounds).
Fry Brothers Heating and Air Conditioning, Inc. employs Larry Clark and George Murnen to make service calls to repair furnaces and air conditioning units in homes. Tom Fry, the owner, would like to know whether there is a difference in the mean number of service calls they make per day. A random sample of 40 days last year showe
An urban planner claims that, nationally, 20 percent of all families renting condominiums move during a given year. A random sample of 200 families renting condominiums in Dallas revealed that 56 had moved during the past year. At the .01 significance level, does this evidence suggest that a larger proportion of condominium owne
The manufacturer of a compact disc player wanted to know whether a 10 percent reduction in price is enough to increase the sales of its product. To investigate, the owner randomly selected eight outlets and sold the disc player at the reduced price. At seven randomly selected outlets, the disc player was sold at the regular pric
In the news recently a New Jersey representative wants to introduce a bill banning smoking while driving to save lives. What study would you design to support his case? What is the null hypothesis? Alternative hypothesis? How would you sample? How many would you include in your sample? What level of significance would you
Based on the attached research on job satisfaction, Using the two pairs of hypotheses How can we test them using ANOVA?
I need some help on answer these questions with workings: (See attached file for full problem description) --- 1) What is the best point estimate of the a) population parameter? b) population variance? 2) A sample of 100 elements produced a mean of 48 and a standard deviation of 8. Find the 99% confidence interval for
Let X,Y be independent, standard normal random variables. Let A={(x,y) belong to R^2: 9<x^2+y^2<16}, Find P((X,Y) belong to A). (See attachment.)
EXHIBIT 1: A manager at a local bank analyzed the relationship between monthly salary and three independent variables: length of service (measured in months), gender (0=female, 1=male) and job type (0=clerical, 1=technical). The following tables summarizes the regression results: df
(1) Suppose a research firm conducted a survey to determine the average amount of money steady smokers spend on cigarettes during a week. A sample of 500 steady smokers revealed that the sample mean is $30 and the sample standard deviation is $8.00. What is the point estimate of the population variance? (a) 30 (b) 40 (c) 8
(1) If the number of miles per gallon achieved by all cars of a particular model has a mean of 25 and a standard deviation of 2, what is the probability that, for a random sample of 20 such cars, the average miles per gallon will be less than 24? Assume that the population distribution is normal. (a) .0125 (b) .1443 (c) .2
One of the questions on a 2004 Business Week Survey was 'when making investment purchases, do you use full service or discount brokerage firms?'. Survey results, which is based on the indication of preference from 1000 respondents, showed that 28.4% of the respondents used only full services and discount brokerage firms. Use alp
Complete all of the following: 1. Test a hypothesis to see whether the average overall job satisfaction (in the population of all workers in the USA) is equal to 4.5 with a = .05. a. State the null hypothesis, the alternative hypothesis, and the significance level. b. Using the data in our database, calculate the test sta
Please answer all questions. Please show all your work (detailed solution) so i can understand how you came up with the anwer. Thanks (See attached file for full problem description) --- EXHIBIT 1: A manager at a local bank analyzed the relationship between monthly salary and three independent variables: length of service
(See attached file for full problem description) --- (1) If the number of miles per gallon achieved by all cars of a particular model has a mean of 25 and a standard deviation of 2, what is the probability that, for a random sample of 20 such cars, the average miles per gallon will be less than 24? Assume that the population
(See attached file for full problem description) --- For Exercise 1, assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. 1. N = 1200, x = 400, 99% confidence For exercise 2, use the sample data and confidence lev
I need help with hypothesis testing and excel. I have attached the sample database for use. Can you please explain how this is done in excel and what the statistical formulas are. I do know that for a hypothesis test with .05 or 95% must compute the z-value which is actual - predit/som var - how do I do this. 1. Test a h
The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness. Records indicate that the mean shelf life of a 5-gallon jug of chlorine is 2,160 hours (90 days). As an experiment, Holdlonger was added to the chlorine to find whether it would increase the shelf life
A researcher is interested in determining the proportion of public elementary schools that have a mandatory school uniform policy. The researcher randomly sampled n=400 public elementary schools and found that 100 of the schools have a mandatory school uniform policy. Suppose the researcher found a test statistic of z=2.5 when
A powerful women's group has claimed that men and women differ in attitudes about sexual discrimination. A group of 50 men (group 1) and 40 women (group 2) were asked if they thought sexual discrimination is a problem in the United States. Eleven of the men and 19 of the women of those sampled did believe that sexual discrimina
A local tennis pro-shop strings tennis rackets at the tension (pounds per square inch) requested by the customer. Recently a customer made a claim that the pro-shop consistently strings rackets at lower tensions, on average, than requested. To support this claim, the customer asked the pro shop to string 10 new rackets at 55 psi
A State University uses thousands of fluorescent light bulbs each year. The brand of bulb it currently uses has a mean life of 900 hours. A manufacturer claims that its new brands of bulbs, which cost the same as the brand the university currently uses, has a mean life of more than 900 hours. The university has decided to purcha
11. From the population of unknown mean μ and a standard deviation σ = 5.0, a sample of n= 100 is selected and the sample mean 40.6 is found. Compare the concepts of estimation and hypothesis testing by answering the following: a. Determine the 95% confidence interval for μ. b. Complete the hypothesis test
(See attached file for full problem description) --- 15 pts. 4. We want to develop a model to predict the selling price of a home based upon the assessed value. A sample of 30 recently sold single-family houses is selected. The results are as follows: Observation Assessed Value (000) Selling Price(000) 1 78.17 94.10 2 8
Inc. Technology reported the results of an Equifax/Harris Consumer Privacy Survey in which 328 Internet users indicated their level of agreement with the following statement:"The government needs to be able to scan internet messages and user communications to prevent fraud and other crimes." The number of users in each response
Excess postexercise oxygen consumption (EPOC) describes the energy expended during the body's recovery period immediately following aerobic exercise. A journal published a study designed to investigate the effect of fitness level on the magnitude and duration of EPOC. Ten healthy young adult males volunteered for the study. Five
A consumer protection group is concerned that a ketchup manufacturer is filling its 20-ounce family-size containers with less than 20 ounces of ketchup. The group purchases 10 family-size bottles of this ketchup, weighs the contents of each, and finds that the mean weight is equal to 19.86 ounces, and the standard deviation is e
An article in the Annals of the Association of American Geographers (June 1992) revealed that only 133 of 337 randomly selected residences in Los Angeles County were protected by earthquake insurance. -What are the appropriate null and alternative hypotheses to test the research hypothesis that less than 40% of the residents