Question 1

A sample of n = 25 scores has a mean of M = 11. If each score in the sample is multiplied by 3, the new mean would be ____.

Select one:

a. 11

b. 3

c. 33

d. 75

**Question 2**

A researcher is measuring problem-solving times for a sample of n = 20 children. However, one of the children fails to solve the problem so the researcher has an undetermined score. What is the best measure of central tendency for these data?

Select one:

a. the mean

b. the median

c. the mode

d. Central tendency cannot be determined for these data.

**Question 3**

A set of N = 10 scores has a mean of ì = 50. If 20 points are added to one of the scores, what is the new value for the population mean?

Select one:

a. 50

b. 51

c. 52

d. 70

**Question 4**

A sample has a mean of M = 86. If one new person is added to the sample, what effect will it have on the sample mean?

Select one:

a. The sample mean will increase.

b. The sample mean will decrease.

c. The sample mean will remain the same.

d. cannot be determined from the information given

**Question 5**

A sample of n = 5 scores has a mean of M = 12. What is Ó× for this sample?

Select one:

a. 12/5 = 2.40

b. 5/12 = 0.417

c. 5(12) = 60

d. cannot be determined from the information given

**Question 6**

A sample has a mean of M = 72. If one person with a score of X = 58 is removed from the sample, what effect will it have on the sample mean?

Select one:

a. The sample mean will increase.

b. The sample mean will decrease.

c. The sample mean will remain the same.

d. cannot be determined from the information given

**Question 7**For the sample shown in the frequency distribution table, the mode is ____.

X |
f |

5 |
1 |

4 |
5 |

3 |
4 |

2 |
1 |

1 |
1 |

Select one:

a. 3

b. 3.5

c. 4

d. 5

**Question 8**

A sample has a mean of M = 40. If 10 points are added to one of the scores, what is the new value for the sample mean?

Select one:

a. still 40

b. 41

c. 50

d. cannot be determined from the information given

**Question 9**

What is the mean for the following scores? Scores:1, 6, 14

Select one:

a. 3

b. 6

c. 7

d. 10.5

**Question 10**

A distribution of scores has a mean of ì = 50. One new score is added to the distribution and the new mean is found to be ì = 48. From this result you can conclude that the new score was ____.

Select one:

a. greater than 50

b. less than 50

c. equal to 48

d. cannot answer from the information given

**Question 11**

Which of the following symbols identifies the population standard deviation?

Select one:

a. s

b. s^{2}

c. ó

d. ó^{2}

**Question 12**

If sample variance is computed by dividing SS by n, then the average value of the sample variances from all the possible random samples will be ____ the population variance.

Select one:

a. smaller than

b. larger than

c. exactly equal to

d. unrelated to

**Question 13**

A population of scores has ì = 50 and ó = 10. If every score in the population is multiplied by 2, then the new mean and standard deviation would be ____.

Select one:

a. ì = 50 and ó = 10

b. ì = 100 and ó = 10

c. ì = 50 and ó = 20

d. ì = 100 and ó = 20

**Question 14**

A population of scores has ì = 50 and ó = 12. If you subtract five points from every score in the population, then the new standard deviation will be ____.

Select one:

a. 7

b. 12

c. 45

d. insufficient information, cannot be determined

**Question 15**

What value is obtained if you add all the deviation scores for a population, then divide the sum by N?

Select one:

a. the population variance

b. the population standard deviation

c. you always will get zero

d. none of the other choices is correct

**Question 16**

What are the values for SS and variance for the following sample of n = 4 scores? Sample:1, 1, 0, 4

Select one:

a. SS = 9 and variance = 3

b. SS = 9 and variance = 2.25

c. SS = 18 and variance = 6

d. SS = 18 and variance = 9

**Question 17**

A population has SS = 30 and ó^{2} = 6. How many scores are in the population?

Select one:

a. N = 5

b. N = 6

c. N = 180

d. cannot be determined without additional information

**Question 18**

If sample variance is computed by dividing SS by df = n - 1, then the average value of the sample variances from all the possible random samples will be ____ the population variance.

Select one:

a. smaller than

b. larger than

c. exactly equal to

d. unrelated to

**Question 19**

On an exam with a mean of ì = 70, you have a score of X = 75. Which of the following values for the standard deviation would give you the highest position within the class?

Select one:

a. s = 1

b. s = 5

c. s = 10

d. cannot determine from the information given

**Question 20**

A population of scores has ì = 50 and ó = 10. If 5 points are added to every score in the population, then the new mean and standard deviation would be ____.

Select one:

a. ì = 50 and ó = 10

b. ì = 55 and ó = 10

c. ì = 50 and ó = 15

d. ì = 55 and ó = 15

* *

Subject | Mathematics |

Due By (Pacific Time) | 06/24/2014 09:26 pm |

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