Tuesday

September 1, 2015
Posted by **Anonymous** on Sunday, August 7, 2011 at 11:02pm.

Answer

a.

1.50%

b.

0.17%

c.

0.20%

d.

0.23%

e.

0.19%

5.92 points

Question 2

In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 400 such persons is drawn, of whom 220 turn out to be currently enrolled in college. Estimate the percentage of all persons age 18 to 24 in that city who are currently enrolled in college.

Answer

a.

50%

b.

41.1%

c.

45%

d.

55%

e.

39.6%

5.88 points

Question 3

In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 400 such persons is drawn, of whom 220 turn out to be currently enrolled in college. Find the SE% for the percentage of all persons age 18 to 24 in that city who are currently enrolled in college.

Answer

a.

2.49%

b.

6.88%

c.

none of these

d.

2.19%

e.

2.20%

5.88 points

Question 4

In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 400 such persons is drawn, of whom 220 turn out to be currently enrolled in college. If possible, find the lower end point for the 90% confidence interval for the percentage of all persons age 18 to 24 in that city who are currently enrolled in college.

Answer

a.

50.89%

b.

not possible

c.

49.82%

d.

none of these

e.

35.22%

5.88 points

Question 5

For a cluster sample, the estimates of the halves came in at 62.70 and 58.85. Find the Standard Error.

Answer

a.

1.15

b.

1.925

c.

0.30

d.

0.20

e.

110.9

5.88 points

Question 6

In a month, the Current Population Survey sample amounted to 100,000 people. Of them, 62,000 were employed, and 3,000 were unemployed. True or False: The Bureau would estimate that 65% of the population was in the labor force.

Answer

a.

False

b.

True

5.88 points

Question 7

In a month, the Current Population Survey sample amounted to 100,000 people. Of them, 62,000 were employed, and 3,000 were unemployed. True or False: The Bureau would estimate the percentage of the population who are unemployed as 4.62%.

Answer

a.

True

b.

False

5.88 points

Question 8

In a month, the Current Population Survey sample amounted to 100,000 people. Of them, 62,000 were employed, and 3,000 were unemployed. True or False: The Bureau would estimate the total number unemployed in the population by using weights obtained by dividing the sample into groups by age, sex, race, area of residence, and so on.

Answer

a.

True

b.

False

5.88 points

Question 9

The probability histogram for the average of the draws will follow the normal curve, even if the contents of the box do not, as long as the histogram is put into standard units, and the number of draws is large.

Answer

a.

False

b.

True

5.88 points

Question 10

The average of a box of tickets is 140. The SD is 10. If we make 400 draws at random, what is the standard error for the average?

Answer

a.

none of these

b.

5

c.

20

d.

200

e.

0.5

5.88 points

Question 11

The tickets in a box have an SD equal to 10. Their average is 120. Two hundred tickets are drawn at random. Find the chance that the average of these two hundred draws is between 118 and 120?

Answer

a.

none of these

b.

95%

c.

100%

d.

75%

e.

68%

5.88 points

Question 12

One kind of plant has only white flowers and pink flowers. According to a genetic model, the offsprings of a certain cross have a 60% chance to be pink-flowering, and a 40% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 130 turn out to be pink-flowering. We wish to determine if the data are consistent with the model.(use one-tailed test) What is the expected value for the percentage of pink-flowering plants?

Answer

a.

60%

b.

50%

c.

75%

d.

34%

e.

40%

5.88 points

Question 13

One kind of plant has only white flowers and pink flowers. According to a genetic model, the offsprings of a certain cross have a 60% chance to be pink-flowering, and a 40% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 130 turn out to be pink-flowering. We wish to determine if the data are consistent with the model.(use one-tailed test) What is the observed value for the percentage of pink-flowering plants?

Answer

a.

65%

b.

75%

c.

60%

d.

50%

e.

40%

5.88 points

Question 14

One kind of plant has only white flowers and pink flowers. According to a genetic model, the offsprings of a certain cross have a 60% chance to be pink-flowering, and a 40% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 130 turn out to be pink-flowering. We wish to determine if the data are consistent with the model.(use one-tailed test) Find the value of the SE%.

Answer

a.

2.99%

b.

1.64%

c.

2.11%

d.

3.46%

e.

1.93%

5.88 points

Question 15

One kind of plant has only white flowers and pink flowers. According to a genetic model, the offsprings of a certain cross have a 60% chance to be pink-flowering, and a 40% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 130 turn out to be pink-flowering. We wish to determine if the data are consistent with the model.(use one-tailed test) Find the value of the test statistic.

Answer

a.

1.31

b.

1.45

c.

2.31

d.

2.01

e.

0.33

5.88 points

Question 16

One kind of plant has only white flowers and pink flowers. According to a genetic model, the offsprings of a certain cross have a 60% chance to be pink-flowering, and a 40% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 130 turn out to be pink-flowering. We wish to determine if the data are consistent with the model.(use one-tailed test) Find the p-value.

Answer

a.

4.95%

b.

none of these

c.

3.59%

d.

3.28%

e.

2.10%

5.88 points

Question 17

One kind of plant has only white flowers and pink flowers. According to a genetic model, the offsprings of a certain cross have a 60% chance to be pink-flowering, and a 40% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 130 turn out to be pink-flowering. We wish to determine if the data are consistent with the model.(use one-tailed test) Are the data consistent with the model?

Answer

a.

No

b.

Yes

- statistics -
**Anonymous**, Saturday, September 24, 2011 at 10:40amFICO Scores The FICO credit rating scores obtained in a simple random sample are listed below. As of this writing, the reported mean FICO score was 678. Do these sample FICO scores appear to be consistent with the reported mean?

714 751 664 789 818 779 698 836 753 834 693 802

- statistics -
**Anonymous**, Saturday, September 24, 2011 at 10:41amFICO Scores – A simple random sample of FICO credit rating scores is listed below, As of this writing, the mean FICO score was reported to be 678. Based on these results, is a FICO score of 500 unusual Why or why not?

714 751 664 789 818 779 698 836 753 834 693 802

- statistics -
**Tanya**, Friday, October 14, 2011 at 2:37am(714+751+664+789+818+779+698+836+753+834+693+802)/12 = 760.97

Answer: No, 760.97 does not equal to 678

Add all numbers then devide by the number of the above numbers (we have 12 in total) and that will give you a mean.

- statistics -
**Mike**, Tuesday, April 3, 2012 at 6:00pmA simple random sample of FICO credit rating scores is listed below:

714 751 664 789 818 779 698 836 753 834 693 802

Find range, variance, and standard deviation.

- statistics -
**emily**, Friday, January 10, 2014 at 12:53amdid you find the answers?