Project #36650 - Stats multiple choice 9

For questions 11 and 12 ignore the options bubbled in those answers are incorrect. 

 

1. A survey was conducted to investigate the severity of rodent problems in egg and poultry operations. A random sample of operators was selected, and the operators were classified according to the type of operation and the extent of the rodent population. A total of 78 egg operators and 53 turkey operators were classified and the summary information is: crosstab1test1

The value of the test statistic is:

 
about 5.64
about 8.60
about 9.71
about 6.81
about 5.99

 
2. 

A survey was conducted to investigate the severity of rodent problems in egg and poultry operations. A random sample of operators was selected, and the operators were classified according to the type of operation and the extent of the rodent population. A total of 78 egg operators and 53 turkey operators were classified and the summary information is:

crosstab1test1

The expected count in the (egg, mild infestation) cell is:

 
about 78.00
about 26.00
about 33.33
about 53.00
about 31.55
 
3. 

A survey was conducted to investigate the severity of rodent problems in egg and poultry operations. A random sample of operators was selected, and the operators were classified according to the type of operation and the extent of the rodent population. A total of 78 egg operators and 53 turkey operators were classified and the summary information is:
crosstab1test1.

The approximate p-value is found to be:

 
about .032
about .014
about .008
about .060
about .05
 
4. 

A survey was conducted to investigate the severity of rodent problems in egg and poultry operations. A random sample of operators was selected, and the operators were classified according to the type of operation and the extent of the rodent population. A total of 78 egg operators and 53 turkey operators were classified and the summary information is:

crosstab1test1

One reviewer of the study suggested that there may be a problem with the study because results from small operators were pooled with the results from large operators. Which of the following is NOT CORRECT?

 
Simpson's paradox occurs when the pooled table gives no evidence of an effect but the individual tables show evidence of an effect.
Simpson's paradox occurs when conclusions from a pooled table differ from the individual tables.
Inspection of the row or column percents will give a good clue if Simpson's paradox is likely to occur.
Tables can be pooled when the underlying rates are equal among tables.
Simpson's paradox occurs when tables with unequal row totals are pooled.
 
5. 

A survey was conducted to investigate the severity of rodent problems in egg and poultry operations. A random sample of operators was selected, and the operators were classified according to the type of operation and the extent of the rodent population. A total of 78 egg operators and 53 turkey operators were classified and the summary information is:

crosstab1test1

Which of the following is not correct?

 
A Type I error would be to conclude that the severity of rodent problems is dependent upon the type of operator while, in fact, the proportion of turkey operators with mild, moderate, and severe rodent problems is the same as the proportion of egg operators with mild, moderate, and severe rodent problems.
The null hypothesis is that the severity of the rodent problem is independent of the type of operator.
The alternate hypothesis is that the proportion of turkey operators with mild, moderate, and severe rodent problems is different from the proportion of egg operators with mild, moderate, and severe rodent problems.
Operators who had both operations could not be used because this type of analysis requires each unit to be counted in one and only one cell.
A Type II error would be to conclude that the proportion of egg operators with mild, moderate, or severe rodent problems is the same as the proportion of turkey operators with mild, moderate, or severe rodent problems when in fact they are independent.
 
6. 

In the paper 'Color Association of Male and Female Fourth-Grade School Children" (J. Psych., 1988, 383-8), children were asked to indicate what emotion they associated with the color red. The response and the sex of the child are noted and summarized below. The first number in each cell is the count, the second number is the row percent.

 
 Frequency|
 Row Pct | anger | happy | love | pain | Total
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 f |  27 |  19 |  39 |  17 |  102
 
 |  26.47 |  18.63 |  38.24 |  16.67 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 m  |  34 |  12 |  38 |  28 |  112
 
  | 30.36 | 10.71 | 33.93 | 25.00 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 Total  61  31  77  45  214
 
 Statistic   DF Value Prob
 
 -----------------------------------------------------------
 
 Pearson Chi-Square  * 4.629 *****
 
 Likelihood Ratio Chi-Square * 4.661 *****
 
 Mantel-Haenszel Chi-Square  1 0.307 *****
Under a suitable null hypothesis, the expected frequency for the cell corresponding to Anger and Males is:
 
15.9
55.7
30.4
29.1
31.9
 
7. 

In the paper "Color Association of Male and Female Fourth-Grade School Children" (J. Psych., 1988, 383-8), children were asked to indicate what emotion they associated with the color red. The response and the sex of the child are noted and summarized below. The first number in each cell is the count, the second number is the row percent.

 
Frequency|
 Row Pct | anger | happy | love | pain | Total
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 f |  27 |  19 |  39 |  17 |  102
 
 |  26.47 |  18.63 |  38.24 |  16.67 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 m  |  34 |  12 |  38 |  28 |  112
 
  | 30.36 | 10.71 | 33.93 | 25.00 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 Total  61  31  77  45  214
 
 Statistic   DF Value Prob
 
 -----------------------------------------------------------
 
 Pearson Chi-Square  * 4.629 *****
 
 Likelihood Ratio Chi-Square * 4.661 *****
 
 Mantel-Haenszel Chi-Square  1 0.307 *****
The null hypothesis is:
 
the number of children in each cell does not depend upon gender nor upon emotion
emotional association with red is independent of gender
gender is dependent upon the emotional association with red
the probability of selecting an emotion with red is related to gender
the color red is independent of the emotion associated with it and with gender.
 
8. 

In the paper "Color Association of Male and Female Fourth-Grade School Children" (J. Psych., 1988, 383-8), children were asked to indicate what emotion they associated with the color red. The response and the sex of the child are noted and summarized below. The first number in each cell is the count, the second number is the row percent.

 
Frequency|
 Row Pct | anger | happy | love | pain | Total
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 f |  27 |  19 |  39 |  17 |  102
 
 |  26.47 |  18.63 |  38.24 |  16.67 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 m  |  34 |  12 |  38 |  28 |  112
 
  | 30.36 | 10.71 | 33.93 | 25.00 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 Total  61  31  77  45  214
 
 Statistic   DF Value Prob
 
 -----------------------------------------------------------
 
 Pearson Chi-Square  * 4.629 *****
 
 Likelihood Ratio Chi-Square * 4.661 *****
 
 Mantel-Haenszel Chi-Square  1 0.307 *****
The null hypothesis will be rejected at alpha=0.05 if the test statistic exceeds:
 
14.07
9.49
3.84
5.99
7.81
 
9. 

In the paper "Color Association of Male and Female Fourth-Grade School Children" (J. Psych., 1988, 383-8), children were asked to indicate what emotion they associated with the color red. The response and the sex of the child are noted and summarized below. The first number in each cell is the count, the second number is the row percent.

 
Frequency|
 Row Pct | anger | happy | love | pain | Total
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 f |  27 |  19 |  39 |  17 |  102
 
 |  26.47 |  18.63 |  38.24 |  16.67 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 m  |  34 |  12 |  38 |  28 |  112
 
  | 30.36 | 10.71 | 33.93 | 25.00 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 Total  61  31  77  45  214
 
 Statistic   DF Value Prob
 
 -----------------------------------------------------------
 
 Pearson Chi-Square  * 4.629 *****
 
 Likelihood Ratio Chi-Square * 4.661 *****
 
 Mantel-Haenszel Chi-Square  1 0.307 *****
Which of the following is not correct?
 
We compute row or column percentages by dividing the cell count by the table total (214).
Each student was classified by gender and by emotion association. Each student was counted in one and only one cell.
We will be unable to compute a correlation for this data because the variables are not both interval or ratio in scale.
More students associate the color red with the emotion "love" than with the emotion "anger".
A lower percentage of female students associate the emotion "anger" with the color red than do male students.
 
10. 

In the paper "Color Association of Male and Female Fourth-Grade School Children" (J. Psych., 1988, 383-8), children were asked to indicate what emotion they associated with the color red. The response and the sex of the child are noted and summarized below. The first number in each cell is the count, the second number is the row percent.

 
Frequency|
 Row Pct | anger | happy | love | pain | Total
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 f |  27 |  19 |  39 |  17 |  102
 
 |  26.47 |  18.63 |  38.24 |  16.67 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 m  |  34 |  12 |  38 |  28 |  112
 
  | 30.36 | 10.71 | 33.93 | 25.00 |
 
 ---------+--------+--------+--------+--------+---------+--------+--------+--------+
 
 Total  61  31  77  45  214
 
 Statistic   DF Value Prob
 
 -----------------------------------------------------------
 
 Pearson Chi-Square  * 4.629 *****
 
 Likelihood Ratio Chi-Square * 4.661 *****
 
 Mantel-Haenszel Chi-Square  1 0.307 *****
The approximate p-value is:
 
Between .005 and .010
Between .010 and .025
Between .100 and .900
Between .050 and .100
Between .025 and .050

 

11. 

Your mathematics instructor claims that, over the years, 88% of his students have said that math is their favorite subject. In this year's class, however, only 21 out of 32 students named math as their favorite class. The instructor decides to construct a confidence interval for the true population proportion based on the sample value. What's the correct value for the standard error of SE in this case?

   
  0.057
  0.045
  0.084
  0.088
  0.064

12. We guess, based on historical data, that 30% of graduating high-school seniors in a large city will have completed a first-year calculus course. What's the minimum sample size needed to construct a 95% confidence interval for a proportion with a margin of error of 2.5%?

   
  1286
  1537
  1533
  1223
  1291

Subject Mathematics
Due By (Pacific Time) 07/29/2014 11:00 pm
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