Exam 2: Basic Descriptive Statistics: Percentages, Ratios and Rates, Tables, Charts and Graphs

The class intervals below represent ages of respondents.Which set of intervals is both exhaustive and mutually exclusive?

Cumulative frequencies and cumulative percentages allow a researcher to

When working with a very small number of cases,it is usually preferable to report

Open-ended intervals

City A (population = 1567 people)had 34 auto thefts last year.City B (population = 34,567)had 40 auto thefts in the same time period and City C (population = 156,980)had 70 auto thefts.Which city had the highest RATE of auto theft?

A city of 1567 people had 34 auto thefts last year.The auto theft rate for this city

A possible problem with open-ended or unequal intervals is that they

For the following stated limits: 23-30 31-38 39-46 What are the real limits?

As a very general rule,frequency distributions should have ____ categories.

To be converted to a percentage,the proportion must be multiplied by

Below are the scores of 25 students on a midterm test.Organize this information into a frequency distribution using a ten point grading scale for class intervals.Include columns for percentages and cumulative percentages.Write a brief description of the distribution. 35 45 65 75 87 80 69 71 53 90 99 95 70 82 73 93 67 61 57 74 72 77 71 81 83

Histograms and line charts or frequency polygons are used with data measured at the

When constructing a frequency distribution,the number of class intervals,in general,should be

A nation had a birth rate of 20 in 1990.The rate fell to 13 in 2000.What was the percentage change?

The ratio of men to women in a karate class is 3.3:1.If there are 100 women,how many men are there?

For a single variable at the interval-ratio level,an appropriate graph would be

Table 2.1 PARTY: COMMUNITY A COMMUNITY B Republican 103 17 Democrat 135 21 Independent 17 15 Socialist TOTALS: 264 64 In Table 2.1,what is the ratio of Independents to Socialists in Community A?

Table 2.2 TABLE 2.2 AGES OF RESPONDENTS ClassIntervals Frequency Percentages 18-23 5 2429 21 30-40 10 TOTAL 36 In Table 2.2,what proportion of cases are 18-23?

Proportions and percentages,ratios and rates are all ways of expressing

Table 2.1 PARTY: COMMUNITY A COMMUNITY B Republican 103 17 Democrat 135 21 Independent 17 15 Socialist 9 11 TOTALS: 264 64 In Table 2.1,what percentage of Community A are Republicans?