QuickHelper

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About QuickHelper

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Teaching Since: May 2017
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  • MBA, PHD
    Phoniex
    Jul-2007 - Jun-2012

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  • Corportae Manager
    ChevronTexaco Corporation
    Feb-2009 - Nov-2016

Category > Accounting Posted 29 Aug 2017 My Price 11.00

Hypothesis Testing, statistics homework help

Question description

 

1. Last year you received an average of 129.2 complaints (i.e., individual items to be fixed under warranty) per new car sold, with a standard deviation of 42.1 com- plaints based on 3,834 new cars sold. This year you have set up a quality assurance program to fix some of these problems before the car is delivered. So far this year, you have had an average of just 93.4 com- plaints per new car sold with a standard deviation of 37.7, based on 74 cars sold so far.

a. To see if your new quality assurance program is working, what hypothesis testing method would you use?

b. Identify the populations, samples, and hypotheses.

c. Perform a two-sided test at the 5% level and report

the results.

2. A group of experts has rated your winery’s two best varietals. Ratings are on a scale from 1 to 20, with higher numbers being better. The results are shown in Table 10.7.6.

  • Is this a paired or unpaired situation? Why?
  • Find the average rating for each varietal and the average difference in ratings (Chardonnay minus Cabernet Sauvignon).
  • Find the appropriate standard error for the average difference.
  • Find the 95% two-sided confidence interval for the mean difference in rating.
  • Test to see if the average ratings are significantly different. If they are significantly different, which varietal is superior?
  • Write a paragraph interpreting the results of this test.

3.

  • To help you decide which of your two current suppliers deserves the larger contract next year, you have rated a random sample of plastic cases from each one. The data are a composite of several measurements, with higher numbers indicating higher quality (Table 10.7.11).
    • a. Find the average quality for each supplier.
    • b. Find the standard deviation of quality for each supplier.
    • c. Find the average difference in quality (International minus Custom) and its standard error.
    • d. Find the two-sided 95% confidence interval for the quality difference.
    • e. Is there a significant difference in quality? How do you know?

    4.Refer to the employee database in Appendix A. View this data set as a random sample from a much larger population of employees. 3.Test to see if the gender ratio differs significantly from 50%.
 4.Test to see if the population mean annual salary for men differs from that for women.

Answers

QuickHelper
(10)
Status NEW Posted 29 Aug 2017 02:08 PM My Price 11.00

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