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statistics

statistics

1.    Suppose a certain fast food chain claims that customers only wait an average of 2.4 minutes on drive through orders.  Believing that the food chain has made a false claim, a certain analyst takes a random sample of 45 drive-thru orders and determines that the 45 customers wait an average of 2.7 minutes with a standard deviation of 0.6 minutes.  Is there sufficient evidence to conclude that the true average waiting time for drive-thru orders at this particular fast food chain is actually more than the claimed 2.4 minutes?  Be sure to identify all parts of the test, and write your conclusion in the context of this scenario.

H0:

Ha:

Decision Rule:

Test Statistic:

P-value:

Conclusion:

2.    Suppose a large labor union wants to estimate the mean number of hours each month that its members are absent from work.  The union randomly samples 320 of its members and records the mean number of hours each of them is absent from work in a one-month period.  If the average is found to be 8.2 hours with a standard deviation of 5.5 hours, estimate the true mean number of hours all union members are absent from work per month with 90% confidence.

3.    In a 2006 poll of a random sample of 2546 American 18 – 24 year olds taken by Harvard’s Institute of Politics, 16% reported that they regularly watch The Daily Show with John Stewart.  Estimate the true proportion of college age students who regularly watch this show with 90% confidence.

4.    The US Commission on Crime wants to estimate the proportion of crimes related to firearms in an area that has one of the highest crime rates in the country.  The commission randomly selects 500 files of recently committed crimes in the area and finds that 320 involved the use of a firearm.

a.    Estimate the percentage of all crimes in this area in which a firearm was used with 95% confidence.

b.    Would the confidence interval become wider or narrower if we lowered the level of confidence?

c.    Explain what 95% confidence means in the context of this problem.

5.    A method currently used by doctors to screen for a particular type of cancer fails to detect cancer in 10% of the patients who actually have the disease.  A new screening method has been developed, and doctors hope that the failure rate of this test will be smaller.  A random sample of 75 people who are known to have this type of cancer is screened using the new technique, and the new method fails to detect the cancer in 6 of the patients.  At the 0.05 level, test the appropriate hypothesis to determine if the new method has lowered the failure rate.

6.    Suppose a management professor wants to estimate with 99% confidence the proportion of CEO’s of medium and large companies with no university degrees.

a.    How large should the professor’s sample be to ensure an estimate that is within 0.05 of the true proportion?

b.    How large should the professor’s sample be to ensure an estimate that is within 0.02 of the true proportion?

c.    If a previous study indicates that about 10% of CEO’s of medium and large companies have no university degrees, how many CEO’s should be sampled by the professor to maintain a margin of error that is no more than 0.02?

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Statistics
Paper instructions:
We are bombarded by statistical information from a wide variety of sources. Much of the statistical research performed in the world is conducted with a great deal of integrity, validity, and reliability. However, there are many statistical studies that are conducted that are—whether intentionally or unintentionally—plagued by bias.

As a member of society, and as a consumer, it is prudent to develop the skills necessary to critically examine reported statistical claims. Determining whether the report contains bias is a great way to determine the reliability of study results and make a better informed decision.

In this assignment, you will apply the guidelines found in the textbook Unit 5B “Should You Believe a Statistical Study?” in order to critically analyze the content, design, and reported results of a statistical study.

Conduct an Internet search to find a study whose statistical results have been published in the news or any other public forum. Applying the following guidelines, critically analyze the study’s reported content and results.

Identify the goal, population, and type of study.
Who conducted the study? Is there bias here?
Is there bias in the sample used in the study?
Are there any problems in defining or measuring the variables of interest in the study?
Are there any confounding variables present in the study?
Are the results presented fairly?
Is the study’s conclusion reasonable? Does it make sense?
Do the results make practical significance?

there needs to be full references with links to where information was obtained from.
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  2. Free Revisions

    We keep the quality bar of all papers high. But in case you need some extra brilliance to the paper, here’s what to do. First of all, you can choose a top writer. It means that we will assign an expert with a degree in your subject. And secondly, you can rely on our editing services. Our editors will revise your papers, checking whether or not they comply with high standards of academic writing. In addition, editing entails adjusting content if it’s off the topic, adding more sources, refining the language style, and making sure the referencing style is followed.
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    We make sure that clients’ personal data remains confidential and is not exploited for any purposes beyond those related to our services. We only ask you to provide us with the information that is required to produce the paper according to your writing needs. Please note that the payment info is protected as well. Feel free to refer to the support team for more information about our payment methods. The fact that you used our service is kept secret due to the advanced security standards. So, you can be sure that no one will find out that you got a paper from our writing service.
  4. Money Back Guarantee

    If the writer doesn’t address all the questions on your assignment brief or the delivered paper appears to be off the topic, you can ask for a refund. Or, if it is applicable, you can opt in for free revision within 14-30 days, depending on your paper’s length. The revision or refund request should be sent within 14 days after delivery. The customer gets 100% money-back in case they haven't downloaded the paper. All approved refunds will be returned to the customer’s credit card or Bonus Balance in a form of store credit. Take a note that we will send an extra compensation if the customers goes with a store credit.
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