9.53 On eight Friday quizzes, Bob received scores of 80, 85, 95, 92, 89, 84, 90, 92. He tells Prof. Hardtack that he is really a 90+ performer but this sample just happened to fall below his true performance level. (a) State an appropriate pair of hypotheses. (b) State the formula for the test statistic and show your decision ru
Part 1 Would like each student in the class to go to the market and purchase 10 bags of M&M regular size candy. This is the 1.69 oz. size We will be using these candies throughout the rest of the course. Please count the number of M&M's in each bag and calculate the following statistics for your sample of ten bags.
The producer of a TV special expected about 40 percent of the viewing audience to watch a rerun of a 1965 Beatles Concert. A sample of 200 homes revealed 60 to be watching the concert. At the 0.10 significance level, does the evidence suggest that less than 40 percent were watching? Use the usual hypothesis testing format. What
A typical college student spends an average of 2.55 hours a day using a computer. A sample of 13 students at The University of Findlay revealed the following number of hours per day using the computer: 3.15 3.25 2.00 2.50 2.65 2.75 2.35 2.85 2.95 2.45 1.95 2.35 3.75 Can we conclude that the mean number of hours per day using t
The mean construction time for a standard two-car garage by Arrowhead Construction Company is 3.5 days. The time for the construction process follows the normal distribution. The construction process is modified through the use of "precut and assembled roof trusses" rather than on site construction of roof rafters. This should s
Last year the records of Dairy Land Inc., a convenience store chain, showed the mean amount spent by a customer was $30. A sample of 40 transactions this month revealed the mean amount spent was $33 with a standard deviation of $12. At the 0.05 significance level, can we conclude that the mean amount spent has increased? What is
Last year the records of Dairy Land Inc., a convenience store chain, showed the mean amount spent by a customer was $30. A sample of 40 transactions this month revealed the mean amount spent was $33 with a standard deviation of $12. At the 0.05 significance level, can we conclude that the mean amount spent has increased? What
10:30: 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 signi
A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces. After the redesign, the absorption amounts of a sample of sponges were (in ounces): 4.1, 3.7, 3.3, 3.5, 3.8, 3.9, 3.6, 3.8, 4.0, and 3.9. What is the decision rule at the 0.01 level of significanc
11.The company believes that it averages about the same weight per bag in each of two production lines. To test this idea, they will perform a hypothesis test to compare the two lines at the alpha level of 0.05. State the null and alternative hypotheses: 12.If the test calculates a sample Z of 1.69, what is the corresponding
1.A company is filling bags of rock salt to a level of 50 pounds. It believes that all bags are filled correctly, but would like to use a hypothesis test with an alpha of 0.05 to check this belief. The company will be using samples of 100 bags from each run to do the test. State the null and alternative hypotheses: Is this a
It is sometimes argued that quantitative techniques such as multiple regression analysis, are of little value because they are always subject to error. Is this a valid argument? Carefully Explain.
The manufacturer of batteries for aircraft emergency vehicles claims that lifetime of the 1500 batteries that have been manufactured is normally distributed with a mean of at least 30 months and a standard deviation of 3 months. An aircraft manufacturer checks out 25 batteries that they purchased and discovers a sample mean of
The buyer of shirts for a department store wants to test whether shirts with sleeve labels of "33 inches" are at least that specification on average. A random sample of n = 100 from 10,000 incoming shirts is to be taken. The sample shows a mean length of 34 inches, with a standard deviation of 2 inches. Find the P value.
Please see the attached file.
Please see the attached file. Consider the use of Police road blocks to detect people that are driving intoxicated. a. What are the null and alternative hypothesis? b. What are the type I and type II errors in this case? c. Which type of error is more costly? d. Based on your answer to part (c), what value of
The fill amounts of bottles of water are normally distributed. (See the Attached Question File).
Develop one research question and formulate a hypothesis which can be tested with linear regression analysis. Formulate a hypothesis statement regarding your research issue.
Convert each z interval to x interval a) -2.17<z b) z<1.28 c) -1.99<z<1.44 d) If the weight is 14 would it be a small animal? e) If it is large would you say z value for the weight of the fawn will be close to 0, -2, or 3 explain. What is given is the mean=27.2 kilograms and standard deviation=4.3 kilograms. I at
Need help formulating a hypothesis statement regarding the real estate data stats enclosed.
A man is on trial accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can be modeled as a significance test with the following hypotheses: Ho: The defendant is innocent H1: The defendant is not inn
Suppose that you perform a significance test regarding a population mean, and that the evidence does not warrant rejection of the null hypothesis. When formulating the conclusion to the test, why is the phrase "fail to reject the null hypothesis" more accurate than the phrase "accept the null hypothesis"? Why can the null hypoth
3. A physician's health study of the effectiveness of aspirin in the reduction of heart attacks was begun in 1982 and completed in 1987. Of 11,037 male medical doctors in the United States who took one 325mg buffered aspirin tablet every other day, 104 suffered heart attacks during the five-year period of the study. Of 11,034
To test the hypothesis that students who finish an exam first get better grades, a professor kept track of the order in which paper were handed in. the first 25 paper showed a mean score of 77.1 with a standard deviation of 19.6. the last 24 paper turned in showed a mean score of 69.3 with a standard deviation of 24.9. Is this a
Does lovastatin reduce the risk of heart attack? Researchers gave lovastatin to 2,325 people and an placebo to 2,081 people. the average age of both groups in 58 years. After 5 years, 57 of the lavastatin group had suffered a heart attack, compared to 97 from the placebo group. At a=.01, can we conclude that the lovastatin users
What do we use the F Distribution to test? Provide an example from your place of employment or circle of influence of an instance when you could use the F Distribution.
Directions: You may include the statistical software output, but you must also include a well-written explanation of the findings. Be sure to answer the question asked in each problem, and explain why, with reference to your output. If you calculate the answers manually, be sure to show your work. I would prefer a Word document
Please see attachment. Thank you. [1.] A recent article in the Topeka Times reported that 40% of all farms in Kansas will have financial problems this year. A recent survey of 200 farms revealed that 66 of them had financial problems. At the α = 0.01 significance level can we conclude that a smaller proportion of far
1) A trucking firm suspects that the mean lifetime of a certain tire uses is less than 35,000miles. To check the claim the firm randomly selects and tests 54 of these tires and gets a mean life time of 34,570 with a standard deviation of 1200 miles. At a alpha = 0.05 test the trucking firms claims. 2) A local brewery distribu
I find business and quality managers tend to overlook the use of this tool when making decisions, primarily because of its apparent complexity. Since software packages, including MiniTab, MegaStat, SPSS, and the ubiquitous MS Excel, are readily available to perform the math functions for us, it would be beneficial to obtain prac