Assignment 3

1. Twenty people were asked how many cigarettes were smoked everyday. The results were recorded as follows:

1,2,1,0,3,4,0,1,1,1,2,2, 3, 2, 3, 2, 1, 4, 0, 0.

Present this data in a frequency distribution table.

2. Thirty AA size batteries were tested to determine how long they lasted. The results, to the nearest minute, were recorded as follows:

423, 369, 387, 411, 393, 394, 371, 377, 389, 409, 392, 408, 431, 401, 363,

391,405, 382, 400, 381, 399, 415, 428, 422, 396, 372, 410,419, 386, 390. ..

Construct a frequency distribution table.

The lowest value is 363 and the highest value is 431.

For the given data, and choosing a class interval of 10, the first class interval should be 360-369 to include 363 (the lowest value).

Quiz 3

Select the best answer to each item:

1. A measure of central tendency, such as the mean (average) is a

a. tabular representation of data b. graphical representation of data

c. numerical representation of data d. historical representation of data

2. A bar graph or a histogram is a

a. tabular representation of data b. graphical representation of data

c. numerical representation of data d. historical representation of data

3. A cumulative frequency distribution is a

a. representation of data b. graphical representation of data

c. numerical representation of data d. historical representation of data

4. Which of the following would be the best number of class intervals to have in a grouped frequency distribution?

a. 3 b. 5 c. 18 d. 25

5. Which type of frequency distribution has a column to indicate the total frequency up to and including a particular value?

a. Cumulative frequency distribution b. Grouped frequency distribution

c. Simple frequency distribution d. Historical frequency distribution