Chapter 2, Problem 6P

### Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

Chapter
Section

### Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

# The following scores are the ages for a random sample of n = 30 drivers who were issued speeding tickets in New York during 2008. Determine the best interval width and place the scores in a grouped frequency distribution table. Prom looking at your table, does it appear that tickets are issued equally across age groups? 17 30 45 20 39 53 28 19 24 21 34 38 22 29 64   22 44 36 16 56 20 23 58 32 25 28 22 51 26 43

To determine

The best interval width and place the scores in a grouped frequency distribution table.

To check: Whether the distribution appears that tickets are issued equally across age groups.

Explanation

Given info:

The ages for random samples of 30drivers are given as:

 Ages 17 30 45 20 39 53 28 19 24 21 34 38 22 29 64 22 44 36 16 56 20 23 58 32 25 22 28 51 26 43

Justification:

The ages that range from X=16 to X=64 that means the smallest score is X=16 and the highest score is X=64. For construct a table of this data need total of 49 rows and it is not possible to provide simple table, so just group the scores into class interval. The below table shows the number of intervals needed for these widths:

 Width Number of intervals needed to cover a range of 46 points 2 25(Too many) 5 10 (OK) 10 5 (Too low)

Conclusion:

An interval width of 5 with 10 intervals is the best option

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