Is there a significant difference in knowledge between on-site and off-site workers before they take the training? 2. Group Statistics Location of Work N Mean Std. Deviation Std. Error Mean Level of Knowledge BeforeTraining On-Site 30 38.10 4.866 .888 Off Site 30 38.87 5.912 1.079 Independent Samples Test Levene's
Refer to the Geographical Analysis (Oct. 2006) study of a new method for analyzing remote sensing data from satellite pixels, Exercise 6.25 (p. 335). Recall that the method uses a numerical measure of the distribution of gaps or hole sizes in the pixel, called lucanarity. Summary statistics for the lacunarity measirements in a
Suppose a random sample of 100 observers from a binomial population gives a value of p* = .63 and you wish to test the null hypothesis that the population parameter p is equal to .70 against the alternative hypothesis that p is less than .70. a) Noting that p* = .63, what does your intuition tell you? Does the value of p* ap
The PGA and Golf Digest have developed the Play Golf America program, in which teaching professionals at participating golf clubs provide a free 10 minute lesson to new customers. According to Golf Digest, golf facilities that participate in the program gain, on average, $2400 in green fees, lessons, or equipment expenditures.
See 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 number of candies per bag. For the Bonus you will be using the methods of 7.5. Be sure to state clear hypotheses, test statistic values, critical value or p-value, decision
13) The owner of a bottling company is considering buying a new bottling machine. He has been testing two different machines that are being considered. After collecting 300 samples from each machine over several weeks, he was able to conduct a two sample z test.<p>He decided to utilize a 0.05 significant level for the test. The
1) A hypothesis test that involves a small sample requires that we make the following assumption that A. a larger computed value of t will be needed to reject the null hypothesis B. the confidence interval will be wider than for large samples C. the region of acceptance will be wider than for large samples D.
See the attached data file. Harrigan University is a liberal arts university in the Midwest that attempts to attract the highest quality students, especially from its region of the country. It has gathered data on 178 applicants who were accepted by Harrigan. The data are in the file named Harrigan which is posted on my webs
A soft drink filling machine, when in perfect adjustment, fills the bottles with 12 ounces of soft drink. A random sample of 25 bottles is selected, and the contents are measured. The sample yielded a mean content of 11.88 ounces, with a standard deviation of 0.24 ounces. Use a 0.05 level of significance and test to see if the
In order to determine whether or not a driver's education course improves the scores on a driving exam, a sample of six students were given the exam before and after taking the course. The results are shown below: Score Score Student Before the Course After the Course 1 83 87 2
The manager of Tammy Corporation wants to determine whether or not the type of work schedule for her employees has any effect on their productivity. She has selected 15 production employees at random and then randomly assigned five employees to each of the three proposed work schedules. The following table shows the units of p
Significance Level: Hypothesis testing is the basis of inferential statistics. Statisticians are always coming up with new tests and testing new characteristics of population parameters. One of the simplest tests that currently exist is the one-sample test for means. A random sample is drawn. If the population variance is
An experimental bumper was designed to reduce damage in low-speed collisions. This bumper was installed on an experimental group of vans in a large fleet, but not on a control group. At the end of a trial period, accident data showed 12 repair incidents for the experimental group and 9 repair incidents for the control group.
A hypothesis can be rejected at one significance level, but not rejected at another significant level for the same set of samples. The level of significance reflects how much error we can tolerate in the test conclusion. For example, when we buy a 4,000-square-feet house, do you think the measurement is really exact 4,000 square
A random sample of 300 beer drinkers is selected and each member of the sample is asked to choose between two brands of beers: Brand A and Brand B. The results are that 165 prefer Brand A and 135 prefer Brand B. Conduct a hypothesis test. What is the p-value, and how much evidence is there to conclude that more than 50% of
Vendall leases soft drink vending machines that are designed to dispense 10 ounces of soft drink. Customers complain when machines dispense too much soft drink, causing spillage, and customers also complain when machines dispense too little soft drink. A particular machine is being tested by a random sample of 144 soft drinks.
The Senior Management of a large multi-state bank, American Flag Bank, has proposed to its Board of Directors introducing a host of new fees/charges, including substantial interest rate increases on preexisting loans. Concerned about a backlash from customers, not to mention regulators and Congress, the Board has directed manag
Auntie Pam's Home Made Wild Grape Jelly has been a great hit through online sales. She has recently expanded her small factory and acquired a new filler machine to accommodate the increased demand, especially for the 12 ounce jar, which is the most popular. Her son (and summer partner) Will has raised concerns that the new mac
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim. In summary, in this problem you are given: x = 10.5 (This is a x with - above it) Ï? = .52 n = 16 ? = .10 In part 1 of 5, you found that the kind of problem is
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim. In this problem you are given: In Part 1 of 5 you found that the kind of problem is; a hypothesis test of the population mean; with the population sigma known; requiri
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim. In summary, in this problem you are given: x = 10.5 (This is a x with - above it) Ï? = .52 n = 16 ? = .10 From part 1 of 5 you found that the kind of proble
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim. A sample of 16 cameras was used; they were tested and found to have a mean number of photographs per second of 10.50. Previous tests of cameras of this type revealed that
Assume you are a camera buff. You and your camera club have recently learned that Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. This is very impressive, but you have learned (from painful experience) to be skeptical of technology claims. You decide to ev
59. Refer to the baseball 2008 data, which reports information on the 30 major league teams for the 2008 baseball season. http://highered.mcgraw-hill.com/sites/0073401781/student_view0/index.html Go to: Datasets. Unzip the file and look for the Baseball file. a. Conduct a test of hypothesis to determine whether the
1. Since 9/11/2001, there has been increased concern for passenger safety. This has led to calls for new and more intrusive passenger screening equipment. While concerns for passengers' privacy are an important part of the debate, there are also concerns for the length of time required to move passengers through the proposed new
1. The senior management of the electric power utility company, let there be light (LTBL), has recently built, at considerable expense, a state of the art nuclear power plant in Gary, Indiana. The utility has applied for a start-up permit from the Environmental Protection Agency (EPA), which has expressed concern over the potent
What is the p-value for the test? Over a period of years, toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product. Because of a minor unadvertised change in the product, there is concern that the satisfaction may have changed. Suppose the satisfaction rating from a sample of 60 customers have a mean of 5.60 and a standard deviation of .87. Do these data indicate that the mean satisfaction rating is different from 5.9? Test with a = .05. What is the p-value for the test?
Over a period of years, toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product. Because of a minor unadvertised change in the product, there is concern that the satisfaction may have changed. Suppose the satisfaction rating from a sample of 60 customers have a mean of
9.23 A manufacturer of chocolate candies uses machines to package candies as they move along a filling line. Although the packages are labelled as 8 ounces, the company wants the packages to contain a mean of 8.17 ounces so that virtually none of the packages contain less than 8 ounces. A sample of 50 packages is selected period
[1.5%] ONE SAMPLE HYPOTHESIS TEST FOR MEAN: A bowler who has averaged 196 pins in the past year is asked to experiment with a ball made of a new kind of material. If he rolls 25 games with the new ball, averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball ha