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    Hypothesis Testing

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    Hypothesis Testing for Stock Annual Return Rates

    The following data on annual rates of return were collected from five stocks listed on the New York Stock Exchange ("the big board") and five stocks listed on NASDAQ. At the .10 significance level, can we conclude that the annual rates of return are higher on the big board? NYSE 17, 16 17, 08 15, 51 8, 43 25, 15 NASDA

    Inferential statistics: Alcohol Consumption By Students

    A study was conducted using 139 students. One of the items studied was the maximun daily amount of alcohol consumed in the last month. Based on the data, are there differences between males and females in the maximum amount of alcohol consumed in any one day in the past month? Use alpha 0.5 Men

    Creating a research question for students, children, or women

    Create a research question for one of the following groups: students, children or women. Include the independent and dependent variables you would study, an explanation of whether a one or two-tail test is most appropriate, your testable null and alternative hypothesis, and an explanation of which alpha level you would select an

    Hypothesis Test - T-Test Weight of Newborn Babies

    The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected and their weights are recorded as 9.0; 7.3; 6.0; 8.8; 6.8; 8.4; and 6.6 pounds. What is the decision for a statistical significant change in average weights at birth at the 5% level of significance?

    Hypothesis Testing: The Claim of Returning to Work

    The claim that ""40% of those persons who retired from an industrial job before the age of 60 would return to work if a suitable job was available" is to be investigated at the 0.02 level of risk. If 74 out of the 200 workers sampled said they would return to work, what is our decision? (a) Do not reject the null hypothesis b

    Hypothesis Testing and Paired Comparisons

    Hypothesis test for the difference of population means: Paired comparisons A consumer products testing group is evaluating two competing brands of tires, Brand 1 and Brand 2. Though the two brands have been comparable in the past, some technological advances were recently made in the Brand 2 manufacturing process, and the cons

    Test statistic and p-value for sample

    Calculate the test statistic and p-value for each sample. a. H0: μ = 60 versus H1: μ = 60, α = .025, ¯x = 63, σ= 8, n = 16 b. H0: μ ≥ 60 versus H1: μ < 60, α = .05, ¯x = 58, σ= 5, n = 25 c. H0: μ ≤ 60 versus H1: μ > 60, α = .05, ¯x = 65, σ= 8, n = 36

    Z test for proportion..

    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

    Hypothesis Testing

    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

    Hypothesis Testing

    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

    Hypothesis Testing

    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 is the p-value? Follow the five-step hypothesis testing procedure.

    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

    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 &#945; = .01, did the yellow fire trucks ...

    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 &#945; = .01, did the yellow fire trucks have a signi

    Null hypothesis - 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, ...

    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

    Hypothesis testing to compare two populations

    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

    Hypothesis testing - 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: ...

    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

    Hypothesis Testing Question

    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

    Test the claim that the shirt sleeves are at least 33 inches.

    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.

    Hypothesis Testing for Police Road Blocks

    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

    Converting z intervals to x intervals

    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

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