Math 227 Fall 2005 Instr: Wong, D

Math 227 Fall 2005 Instr: Wong, D. Ch1&2 Test Name:______

Select the best answer for #1 to #10. Each question is worth 3 points for #1 to #10.

#1 The ethnic origin of a candidate for public office is an example of what type of data?

(a) Qualitative (b) Quantitative

#2 The survival time of lung cancer patient after a particular regimen of radiotherapy is an

example of what type of data?

(a) Qualitative (b) Quantitative continuous (c) Quantitative discrete

#3 Colors of automobiles are measured on what scale?

(a) Nominal (b) Ratio (c) Ordinal (d) Interval

#4 Weights of beef cattle fed a special diet are measured on what scale?

(a) Nominal (b) Ratio (c) Ordinal (d) Interval

#5 Identify the following study as being either observational or experimental.

A researcher stood at a busy intersection to see if the color of an automobile a person

drives is related to running red lights.

(a) Experimental Study (b) Observational Study

#6 The weather station predicted that there is a 10% chance of raining for tomorrow.

Which branch of statistics is used?

(a) Inferential Statistics (b) Descriptive Statistics

#7 The median household income is $65,352 in 2004.

Which branch of statistics is used?

(a) Inferential Statistics (b) Descriptive Statistics

#8 Which sampling method is used for the winner of a lottery game?

(a) Random Sampling (b) Systematic Sampling

#9 Customers are separated in groups (children, teen-adult, and adult) and then a few from

each group is selected randomly to make up a sample.

Which sampling method is used?

(a) Random Sampling (b) Systematic Sampling

#10 Which of the following correctly describes the relationship between a sample and a

population?

(a) A sample is a group of populations that are subject to observation.

(b) A population is a group of samples that may or may not be included in a study.

(d) A population and a sample are not related.

#11 Construct a stem and leaf plot for the data listed below and comment of the shape of the

7pt. shape of the distribution as a bell-shaped curve, skewed to the right, or skewed to the left.

17 38 26 13 18 34 16 42 28 24 40 20 23 31 35 19 28 25 52 67

#12 The minimum value and the maximum value of a data set are 85 and 197 respectively.

4pt. If 5 classes are desired for constructing a grouped frequency distribution, what should

the class width be?

#13 Construct a pie graph.

10pt.

Rating of
a instructor / Number of
Students
Excellent / 19
Above Average / 11
Average / 7
Poor / 3

#14 State which graph (Pareto chart, time series graph, or pie graph) would most

3pt. appropriately represent the given situation.

each

(a) The number of airline departures (in millions) at an airport for each year during

the last 5 years.

(b) The frequency of each type of crime committed in a city during the year.

#15 True or False.

2pt.

each ______(a) When running an experimental study, the group that is manipulated

is called the treatment group.

______(b) Stem-and-leaf plots are not useful for spotting outliers, since

the individual data values are not shown.

______(c) A truncated bar graph runs the risk of exaggerating trends and

differences that are not actually representative of the data.

#16 The given frequency distribution describes the speeds of drivers ticketed by the City of

Diamond Bar police. These drivers were traveling through a 25 mi/h speed zone.

(a) Fill in the table.

5pt. 5pt. 5pt. 5pt.

Class Limit (Speed) / / Class Boundaries / Class Mark / Relative Frequency / Cumulative Frequency
34 – 37 / 5
38 - 41 / 12
42 - 45 / 24
46 - 49 / 14
50 - 53 / 4

2pt (b) What is the class width?

Class width = ______

con't #16

8pt. (c) Construct a relative frequency histogram and comment on the shape of the

distribution as a bell-shaped curve, skewed to the right, or skewed to the left.

7pt. (d) Construct a frequency polygon.