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1. |
If the lowest class interval of the set of data
{67, 90, 83, 85, 73, 80, 78, 79, 68, 71} is 65-70,
find the class mark of that interval. |
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A. |
2 |
B. |
67.5 |
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C. |
65 |
D. |
70 |
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Hint |
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2. |
Use the set of data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71}. If the data are grouped so that the lowest class interval is 65-70, how many classes are formed? |
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A. |
6 |
B. |
4 |
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C. |
3 |
D. |
5 |
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Hint |
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3. |
Construct a stem-and-leaf plot for the data
{67, 90, 83, 85, 73, 80, 78, 79, 68, 71}. |
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A. |
 |
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B. |
 |
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C. |
 |
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D. |
 |
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Hint |
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4. |
Which value is an outlier of the set of data
{67, 90, 83, 85, 73, 80, 78, 79, 68, 71}? |
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A. |
90 |
B. |
67 |
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C. |
68 |
D. |
There is no outlier for the data. |
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Hint |
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5. |
Given the partial table below, identify the upper and lower limits of an interval about the mean within which 45% of the values of a set of data can be found if the mean is 30.5 and the standard deviation is 13.8. Assume the data are normally distributed. |
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A. |
9.6-18.0 |
B. |
5.5-22.1 |
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C. |
26.3-34.7 |
D. |
22.22-38.78 |
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Hint |
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6. |
 |
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A. |
the size of the sample |
B. |
none of these |
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C. |
both the size of the sample and the population |
D. |
the size of the population |
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Hint |
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7. |
Find the value of x so that the median of
{4, 9, 6, 4, 4, 10, 5, x, 8, 9} is 6.5. |
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A. |
6 |
B. |
7 |
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C. |
5 |
D. |
8 |
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Hint |
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8. |
Find the true statement related to the data below.
20, 15, 23, 14, 18, 12, 25, 10, 24, 12, 17 |
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A. |
The middle half of the data are between 17 and 25. |
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B. |
The data is more clustered between Q2 and Q3 than between Q1 and Q2. |
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C. |
The data is more clustered between Q1 and Q2 than between Q2 and Q3. |
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D. |
The semi-interquartile range is 5. |
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Hint |
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9. |
Find the upper and lower limits of an interval about the mean within which 87% of the values of a set of normally distributed data can be found if  and  Use the table below to help you. |
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A. |
44.2–85.8 |
B. |
52–78 |
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C. |
45.5–84.5 |
D. |
40–80 |
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Hint |
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10. |
If  ,  , and N = 150, find the interval such that the probability is 90% that the mean of the population lies within that interval. Use the table below to help you. |
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A. |
48.628–55.103 |
B. |
49.760–54.240 |
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C. |
49.051–54.949 |
D. |
50.114–53.886 |
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Hint |
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