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sunnysummer sunnysummer
wrote...
6 years ago
A study by the Poultry Research Center seeks to determine if diet affects the onset of egg laying in juvenile Rhode Island Red hens. In a group of 34 hens that were fed scratch grain, 12 were laying eggs at 13 weeks of age. In a second, independent group of 25 hens that were fed on layer pellets, 4 hens were laying at 13 weeks of age. The 95 confidence interval for the difference in laying proportions at 13 weeks is:
  1.0.19  0.13
  2.0  0.13
  3.8  10
  4.0.16  0.06
  5.0.19  0.22

Q. 2

A 90 confidence interval for p1 - p2 is (0.05, 0.002). Which of the following is the 95 confidence interval calculated from the same data?
  1.(0.058, 0.005)
  2.(0.055, 0.003)
  3.(0.003, 0.055)
  4.(0.005, 0.058)
  5.(0.01, 0.06)

Q. 3

The standard deviation of p1 - p2 used in the large sample test of p1 - p2 is the same as the standard deviation used in the large sample confidence interval for p1 - p2.
  1.True
  2.False

Q. 4

The P-value for a hypothesis test concerning the difference in two population proportions is always calculated by finding the area to the right of the test statistic, regardless of the alternative hypothesis.
  1.True
  2.False

Q. 5

Two samples are said to be independent when the selection of the individuals in one sample has no bearing on the selection of those in the other sample.
  1.True
  2.False

Q. 6

A recent study by researchers at EMU and UM found that an increasing number of college women view heavy alcohol consumption as a way to make a feminist statement. Of the college women interviewed, 60 reported that if they were to drink like a guy their male peers would take notice. These data are to be used to test if a majority of area undergraduate college women in the area have this perception, that is, to test the hypotheses: H0: p = 0.50 versus Ha: p > 0.50. The p-value for the test was 0.078. Select the appropriate decision using
  a 5 significance level.
  1.The result is statistically significant so the null hypothesis can be rejected.
  2.The result is statistically significant so the null hypothesis cannot be rejected.
  3.The result is not statistically significant so the null hypothesis can be rejected.
  4.The result is not statistically significant so the null hypothesis cannot be rejected.

Q. 7

A recent study by researchers at EMU and UM found that an increasing number of college women view heavy alcohol consumption as a way to make a feminist statement. The study involved interviews with a large number of undergraduate women during the spring of 2003. Of the college women interviewed, 60 reported that if they were to drink like a guy their male peers would take notice. These data are to be used to test if a majority of area undergraduate college women in the area have this perception, that is, to test the hypotheses:
  H0: p = 0.50 versus Ha: p > 0.50.
  1.The z-statistic would be negative since 0.50 or 50 is smaller than 60.
  2.The z-statistic would be positive since 60 or 0.60 is larger than 0.50.
  3.The sign of the z-statistic cannot be known since we do not know the sample size n.

Q. 8

The National Institute of Mental Health reported in the past that 20 of adult Americans suffer from a certain psychiatric disorder. A researcher would like to assess if the psychiatric disorder rate has been on the rise (that is, is currently higher than 20). A random sample of 80 adult Americans undergo an examination and 20 resulted in having a psychiatric disorder. Is this sufficient evidence to suggest the rate has significantly increased at a 5
   significance level? At the 5 significance
   level, which is the appropriate conclusion?


  1.Based on this data there is not sufficient evidence to say the rate is higher than 20.
  2.Based on this data there is sufficient evidence to say the rate is higher than 20.

Q. 9

The National Institute of Mental Health reported in the past that 20 of adult Americans suffer from a certain psychiatric disorder. A researcher would like to assess if the psychiatric disorder rate has been on the rise (that is, is currently higher than 20). A random sample of 80 adult Americans undergo an examination and 20 resulted in having a psychiatric disorder. Is this sufficient evidence to suggest the rate has significantly increased at a 5
   significance level? Are the results
   statistically significant at the 5 level?


  1.Yes
  2.No
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6 years ago
Answer to #1

5

Answer to #2

2

Answer to #3

2

Answer to #4

2

Answer to #5

1

Answer to #6

4

Answer to #7

2

Answer to #8

1

Answer to #9

2
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