7) An electronics manufacturing process has a scheduled mean completion time of 75 minutes. It is claimed that, under new management, the mean completion time is less than 75 minutes. To test this claim, a random sample of 9 completion times under new management was taken. The sample had a mean completion time of 73 minutes an
5) The breaking strengths of cables produced by a certain manufacturer have a mean of 1775 pounds, and a standard deviation of 55 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 90 newly manufactured cables are randomly chosen and tested,
The manager of a driving school claims that the mean time taken to learn how to drive a car is 8 hours or less for all new drivers. A sample of 16 new drivers showed that the mean time taken by them to learn how to drive the car is 9.5 hours with a standard deviation of 1.5 hours. Test the manager's claim at the 1% significance
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, there were 12 repair incidents (a "repair incident" is an accident that resulted in a repair invoice) for the experim
I am doing a paper investigating whether a combination of behavioral therapy and medication is more successful in treating depression patients than medication alone. I need help in putting this paper together along with some references. I also need to address these questions: 1. Describe your selected research issue, problem,
In recent years major efforts have been made to standardize accounting practices in different countries; this is called harmonization. In an article in Accounting and Business Research, Emmanuel N. Emenyonu and Sidney J. Gray (1992) studied the extent to which accounting practices in France, Germany, and the United Kingdom are h
How do we decide whether to use a z test or a t test when testing a hypothesis about a population mean?
Give an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your test. Explain how you would settle on a reasonable level of significance for your scenario. Also explain what the type I and II errors would be if you reached the incorrect conclusion in
Assume you are the manager of a paint manufacturing factory. Your company has received complaints from customers that the containers hold less than the amount printed on them. On the other hand, corporate management is concerned that the containers hold more than the standard amount. You assign a statistician to verify the claim
When doing hypothesis testing we have two ways of making a decision - the critical value method and the p-value method. While both give the same results in terms of determining whether to reject or not reject the null hypothesis, most statistical analysts prefer the p-value method. Describe the two methods and explain why the
1) Compute/answer the following about the variables "Balance" and "ATM", fr om the Century National Bank Data Set. a) Develop a scatter diagram that represents the question, do higher balances lead to higher usage of ATMs? b) The coefficient of correlation (interpret) c) The coefficient of determination (interpret) d) Is
In each case, identify the population parameter about which a claim is made, state the null and alternative hypotheses for a hypothesis test, and indicate whether the hypothesis test will be left-tailed, right-tailed, or two-tailed a. The manufacturer of a new model of hybrid car advertises that the mean fuel consumption i
The production line that packages boxes of raisins at a snack food manufacturer will be considered operating properly if the average weight of the boxes of raisins is 1.5 ounces with a standard deviation of 0.1 ounces. A random sample of 16 boxes showed an average weight of 1.45 ounces. 1. How can I find the null and altern
The manufacturer of a new antidepressant claims that, among all people with depression who use the drug, the proportion p of people who find relief from depression is at least 80% . A random sample of 215 patients who use this new drug is selected, and 170 of them find relief from depression. Based on these data, can we reject t
See the attached file. 2(a). In the context of hypothesis test, state what is meant by: (i). Type I error (ii). Type II error (iii). Power of the test What connections are there, if any, between them? (b). The sales and marketing team in motor business is investigating the quality of second hand cars. One indicator o
I Completed the first half, but I am struggling with the questions below. They are multiple choice. Objective: Apply hypothesis testing to different populations and samples in business research situations. 5. One characteristic of any Student's t distribution is a. It is right skewed. b. As n increases, the t-di
1. A researcher conducts an experiment comparing three treatment conditions. The data consist of n=20 scores for each treatment condition. a. If the researcher used an independent-measures design, then how many individuals were needed for the study and what are the df values for the F ratio? b. If the researcher used a repeate
A production line operates with a mean filling weight of 500 grams per container. Over filling or under filling presents a serious problem and when detected requires the operator to shut down the production line to readjust the filling mechanism. From past data, a population standard deviation = 25 grams is assumed. A quality co
2. A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the .10 level of significance, that the average trunk diameter of a pine tree is greater than the average diameter of a spruce tree? Pin
If you choose to solve these problems, please show the steps and formulas used. 1. A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is
1. Use a P- value to test the claim about the population mean μ using the given sample statistics. State your decision for α = 0.05 Claim: μ ≠230; Sample statistics: x (bar) = 216.5, s = 17.3, n = 48 = _ 2. If X =5.2, R =.3,and n=4, and if specifications are (4.6, 5.8), is the process capable? Show work.
1) Two gasoline additives will be tested to determine their impact on miles per gallon for passenger cars. In the experiment, each car was tested with both gasoline additives. Use a level of significance α = 0.05 and the rank sum test Wilcoxon test whether any significant difference in the two additives.
Sample Item Original Supplier New Supplier 1 0.374 0.391 2 0.387 0.375 3 0.359 0.365 4 0.391 0.360 5 0.390 0.366 6 0.361 0.378 7 0.376 0.377 8 0.371 0.364 9 0.373 0.332 10 0.364 0.343 11 0.390 0.378 12 0.384 0.401 13 0.384 0.382 14 0.383 0.381 15 0.381 0.363 16 0.369 0.371 17 0.361 0.352 18 0.376 0.393 19 0.38
The maker of refrigerators buys bolts from two suppliers, and it is very important that the mean widths of the bolts received from both suppliers are equal since they must be used interchangeably. The refrigerator maker receives a large shipment of volts from each supplier and draws a random sample of 49 bolts from each shipmen
A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample. The target accuracy is a variance in measurements of 1.2 or less. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2.2, does this provide enough evide
See attached file for data. 10.28 Multiple myeloma, or blood plasma cancer, is characterized by increased blood vessel formulation (angiogenesis) in the bone marrow that is a prognostic factor in survival. One treatment approach used for multiple myeloma is stem cell transplantation with the patient's own stem cells. The fo
9.69 Late payment of medical claims can add to the cost of health care. An article (M. Freudenheim, "The Check in Not in the Mail," The New York Times, May 25, 2006, pp.C1, C6) reported that for one insurance company, 85.1% of the claims were paid in full when first submitted. Supposed the insurance company developed a new pay
True or False: The t distribution is used to develop a confidence interval estimate of the population mean when the population standard deviation is unknown. True or False: The confidence interval estimate of the population proportion is constructed around the sample proportion. True or False: The F test used for testing t
In a one-way ANOVA, there are three treatments with n1 = 6, n2 = 9 and n3 = 7. The rejection region for this test at the 97.5% level of significance is: 4.42 39.4 4.51 39.5 Please show all of your work
Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5%