A large company owns 4 manufacturing plants. At each of the 4 plants, they collected a sample of 100 products and for each product, they determined whether or not the product was defective. The company would like to know if the rate of defects significantly differs across the 4 manufacturing plants. They can use ANOVA to test their hypothesis.
True
False
Correct option:
False
Explanation:
ANOVA test is used only for testing the significance of difference between means of two or more groups. Here the rate of defects are compared and so ANOVA cannot applied.
A large company owns 4 manufacturing plants. At each of the 4 plants, they collected a sample of 100 products and for each product, they determined whether or not the product was defective. The compan...
A company manufacturing computer chips finds that 8% of all chips manufactured are defective. In an effort to decrease the percentage of defective chips, management decides to provide additional training to those employees hired within the last year. After training was implemented, a sample of 450 chips revealed only 27 defects. A hypothesis test is performed to determine if the additional training was effective in lowering the defect rate. This hypothesis test is a two-tailed test about a proportion. True...
A company with two plants producing the same product, but with two slightly different manufacturing processes, conducted a sample study at each of the two plants with the following results: The sample statistics from the first group are: n = 40, x-bar = 18, s = 4.2. The sample statistics from the second group are: n = 50, x-bar = 20, s = 4. In testing the hypothesis that the mean time to produce the product is the same at...
Question 4 (1 point) A company manufacturing computer chips finds that 8% of all chips manufactured are defective. In an effort to decrease the percentage of defective chips, management decides to provide additional training to employees. After training was implemented, a sample of 450 chips revealed only 27 defects. Using hypothesis testing we want to investigate if the additional training was effective in lowering the defect rate. Which of the following statements is true about this hypothesis test? It is...
PROBLEM-1) (100 Pts) At an aircraft manufacturing company six test systems are used in the final test of the XYZ part. The test systems are being compared concerning the sensitivity measure of the product. A random sample of four sensitivity measures from each test system is used to determine whether the mean sensitivity measurement varies among test systems. The followings are the measurements in gr per square millimeter x 10-1. 1 5 6 18.6 15.8 16.9 17.5 2 15.4 17.7...
29. manufacturing company uses a chi-square goodness of fit test to determine if a population of all lengths of A fastener -inch bolts it manufactures is distributed according to a normal distribution. If we reasonable to assume that the population distribution is at least eject the null hy approximately normally distributed. O True O False 30. A manufacturing company produces part 2205 for the aerospace industry. This particular part can be manufactured using 3 different production processes. The management wants...
There is one of each of the following tests described in the scenarios: one sample z test, one sample t test and a matched pair t test. For each scenario decide what type of hypothesis testing procedure is appropriate and explain why. Scenario 1. A sunglass company wants potential customers to compare two types of lenses, the current lenses and lenses made with a new high-tech material. A random sample of 42 customers are asked to wear each type of...
2. (2 True-False. Just say whether each statement is True or False – no need to justify your answer. 1. If the number of trials in the binomial distribution increases by 1 (and P equals .50), the probability of getting either of the most extreme possible outcomes (that is, 0 or N) is cut in half. 2. If the number of trials in the binomial distribution increases by 1 (and P does not equal .50), the probability of getting either of...
Question 13 (1 point) Does the average internet speed of an ISP depend on continent? Specifically, you would like to test whether customers in North America have an average internet! download speed that is different from the average download speed of customers in Europe. If North American customers are in group 1 and European customers are in group 2, what are the hypotheses for your test of interest? On Ho H1 = H2 . HAHI + H2 12. Hoilla +...
1. We reject the null hypothesis only when: a. our sample mean is larger than the population mean. b. the p value associated with our test statistic is greater than the significance level of the test we have chosen. c. our sample mean is smaller than the population mean. d. the p value associated with our test statistic is smaller than the significance level of the test we have chosen. 2. In a study of simulated juror decision making, researchers...
Engineers at a large automobile manufacturing company are trying to decide whether to purchase brand A or brand B tires for the company's new models. To help them arrive at a decision, an experiment is conducted using 12 of each brand. The tires are run until they wear out, with the accompanying results. Test the hypothesis that there is no difference in the average wear of the two brands of tires. Assume the populations to be approximately normally distributed with...