Question 200694
Needing a little help please......?
2 pts) The objective of statistics is best described as: 
A) To make inferences about a sample based on information we get from a population
B) To make inferences about a population based on information we get from a sample taken from the population
C) To use population mean, m as an estimate of the sample mean, 
D) To make inferences about a sample with a high degree of reliability 
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Ans: B
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2. (5 pts) Construct a frequency distribution of the ages that 30 randomly selected smokers started smoking: 
25 26 25 17 16 16 14 17 21 16
15 18 17 15 15 19 16 17 23 15
19 17 16 26 16 25 16 17 22 24 
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14---------------1
15---------------4
16---------------7
17---------------6
18---------------1
19---------------2
21---------------1
22---------------1
23---------------1
24---------------1
25---------------3
26---------------2

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3. (2 pts) Three-fourths of the numbers in any data set will be larger than the 
A) third quartile B) fourth quartile C) median D) midrange 
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Ans: A
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4. (2 pts) The number that appears most frequently in a data set is the 
A) mean B) midrange C) median D) mode 
Ans: D
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5. (2 pts) Half of the scores in any data set are below the 
A) first quartile B) second quartile C) third quartile D) median 
Ans: B
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6. (6 pts) Find the mean, median, and mode for the following set of data which shows the number of pages per article in a random sample of magazine articles. 
6 7 5 4 7 5 5 7
8 5 3 6 8 9 5 

7. (8 pts) Construct a histogram and a frequency polygon for the following frequency distribution 
Miles Number of Commuters
Class Frequency
0 - 20 7
21 - 40 3
41 - 60 12
61 - 80 10
81 –100 4 

8. (5 pts) State True or False 
a) A collection of all the objects to be studied is a population.
T
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b) A subset or part of the population is called a partial population.
Maybe some texts will use this term
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c) In a frequency distribution, the class size is always 4.
F
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d) The sum of the percents of the sectors in a pie chart should be 100%.
T
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e) A frequency distribution can be illustrated using a histogram. 
T
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9. (6 pts) In a study of 100 married women with children, the subjects were asked the major reason for working outside the home. The study resulted in the following data: 
Reason Number of Responses
To support self/family 65
For extra money 20
For something different to do 10
Other 5
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Total 100 
Construct a pie chart for the data and analyze the results. 
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10. (2 pts) A county commissioner would like to find out how people in his county feel about a county lottery to support education. How might a cluster sample be selected? 
See your text book.
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11. (4 pts) The following statistics provide information about the scores on a national History exam. 
Mean 540 First Quartile 260
Median 450 Third Quartile 678
Mode 468 90th Percentile 890 
a) What score did half of the test takers surpass?
450
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b) What was the most common score? 
468
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c) What percentage of the test takers scored 678 or better?
25%
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d) If Joe had a score of 890, explain the meaning of his score.
90% of the people tested had a lower score than him.
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Cheers,
Stan H.