Ch.9 Quiz

Instructions
Please read the questions carefully.

This assessment is worth 100 points.

  1. What is the level of significance?   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  

  2. A random sample of size 15 is selected from a normal population. The population standard deviation is unknown. Assume that a two-tailed test at the 0.10 significance level is to be used. For what value of t will the null hypothesis not be rejected?   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  

  3. To conduct a test of hypothesis with a small sample, we need to be able to make the following assumption that:   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  

  4. If the 1% level of significance is used and the computed value of z is +6.00, what is our decision?   (10 points)

    a.  
    b.  
    c.  
    d.  

  5. Which of the following is a test statistic used to test a hypothesis about a population?   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  

  6. What are the critical z-values for a two-tailed hypothesis test if a = 0.01?   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  

  7. What must both np and n(1 – p) exceed in testing a hypothesis involving one proportion?   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  

  8. Based on the Nielsen ratings, the local CBS affiliate claims its 11:00 PM newscast reaches 41% of the viewing audience in the area. In a survey of 100 viewers, 36% indicated that they watch the late evening news on this local CBS station.

    What is the critical value if the level of significance is 0.10?   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  

  9. 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 at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds.

    What is the alternate hypothesis?   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  

  10. 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 at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds.

    If a = 0.05, what is the critical t value?   (10 points)

    a.  
    b.  
    c.  
    d.  
    e.  



Portions copyright ©2005 The McGraw-Hill Companies.
Any use is subject to the Terms of Use and Privacy Policy.
McGraw-Hill Higher Education is one of the many fine businesses of The McGraw-Hill Companies.