QMM 280 UNCW
1. Which of the following is a descriptive statistic?: All of these choices are correct.
2. Suppose the growth chart at a pediatrician's office is not hung correctly such that it
measures children 2 inches taller than their actual height. If the heights of ten children are
recorded, which of the following is a true
statement?: The measurements of the heights that were recorded represent a data acquisition
error.
3. Statistical studies in which researchers control variables of interest are: ex- perimental studies.
4. In production, which of the following indicates "underfilling"?: Underfilling occurs when a
plotted value is below the chart's lower control limit.
5. A characteristic of interest for the elements is called a(n): variable.
6. A sample of 100 individuals in a town was asked how much they paid in property tax per year. On
the basis of this information, the reporter states that the average property tax bill of all residents of
the town is $1500. This is an example of: statistical inference.
7. A local grocery store recorded the amount spent for a sample of 50 cus- tomers who purchased
groceries. Which of the following is not a true state- ment?: This is an experimental study.
8. A data set that is collected at the same or approximately same point in time would be: cross-
sectional data.
9. The table is an example of: cross-tabulation data
10.A hospital has noted that on average there are 35 emergency room visits per month involving
children. The average number of visits is an example of: a descriptive statistic.
11.Consider the following data summary.: a histogram.
12.Which of the following variables is quantitative?: Weight of a package
13.Which of the following professionals frequently use statistical techniques to provide forecasts
about the future of the economy?: Economists
14.Which of the following disciplines has contributed the least to the devel- opment of data mining
procedures?: Psychology
15.What does the term "statistics" refer to?: Statistics is the art and science of collecting,
analyzing, presenting and interpreting data.
16.Which of the following is an example of an observational study?: All of these choices are
examples of observational studies.
, QMM 280 UNCW
17.In a sample of 200 people who own a house, 180, or 90%, also own two or more vehicles. The
90% is an example of: a descriptive statistic
18. Using data containing errors is always better than using no data at all.: -
False
19.A survey of 40 students at an elementary school found that the average number of tardy days
per semester was 15. The 15 is an example of: both choices "quantitative data" and "a
descriptive statistic" are correct.
20.Local residents were surveyed for their satisfaction with the local govern- ment. The responses
were recorded as follows: 0-not satisfied, 1-somewhat dissatisfied, 2-satisfied, 3-very satisfied. The
variable recorded is an example of what type of variable?: a variable measured on the ordinal
scale.
21.The city would like to conduct a study of the opinions of its residents on an upcoming election.
Since it would be too costly to call every person who is registered to vote in the city they decide to
call every 15th person in the records database. Which of the following is correct?: The study is a
sample survey.
22.Data mining is the process of uncovering hidden information that can be used to: predict
23. Consider the following data as well as the corresponding st display on the
annual property taxes for eight residents of a city em-and-leaf
.: 100
24.Which of the following statements is true with respect to bar charts?: A bar chart can be used
for a data set with a relatively small number of possible categories.
25.The sum of the frequencies for all classes will always equal: the number of elements in a data
set
26. Information on the number of new teachers hired in a school each of 4 years is district
given in the table below.
for
The percent frequency of new hires in 1998 is:: 40%
27. Which of the following cannot be conveyed using a stem-and-leaf display? (Assume that the
entire values are used in creating the stem-and-leaf display.)-
: The order in which the observations were taken
28. The number of sick days taken (per month) by 150 factory wo summarized rkers
below. is
The cumulative frequency for the class 11 - 15 is:: 145
29. Consider the scatter diagram below.
1. Which of the following is a descriptive statistic?: All of these choices are correct.
2. Suppose the growth chart at a pediatrician's office is not hung correctly such that it
measures children 2 inches taller than their actual height. If the heights of ten children are
recorded, which of the following is a true
statement?: The measurements of the heights that were recorded represent a data acquisition
error.
3. Statistical studies in which researchers control variables of interest are: ex- perimental studies.
4. In production, which of the following indicates "underfilling"?: Underfilling occurs when a
plotted value is below the chart's lower control limit.
5. A characteristic of interest for the elements is called a(n): variable.
6. A sample of 100 individuals in a town was asked how much they paid in property tax per year. On
the basis of this information, the reporter states that the average property tax bill of all residents of
the town is $1500. This is an example of: statistical inference.
7. A local grocery store recorded the amount spent for a sample of 50 cus- tomers who purchased
groceries. Which of the following is not a true state- ment?: This is an experimental study.
8. A data set that is collected at the same or approximately same point in time would be: cross-
sectional data.
9. The table is an example of: cross-tabulation data
10.A hospital has noted that on average there are 35 emergency room visits per month involving
children. The average number of visits is an example of: a descriptive statistic.
11.Consider the following data summary.: a histogram.
12.Which of the following variables is quantitative?: Weight of a package
13.Which of the following professionals frequently use statistical techniques to provide forecasts
about the future of the economy?: Economists
14.Which of the following disciplines has contributed the least to the devel- opment of data mining
procedures?: Psychology
15.What does the term "statistics" refer to?: Statistics is the art and science of collecting,
analyzing, presenting and interpreting data.
16.Which of the following is an example of an observational study?: All of these choices are
examples of observational studies.
, QMM 280 UNCW
17.In a sample of 200 people who own a house, 180, or 90%, also own two or more vehicles. The
90% is an example of: a descriptive statistic
18. Using data containing errors is always better than using no data at all.: -
False
19.A survey of 40 students at an elementary school found that the average number of tardy days
per semester was 15. The 15 is an example of: both choices "quantitative data" and "a
descriptive statistic" are correct.
20.Local residents were surveyed for their satisfaction with the local govern- ment. The responses
were recorded as follows: 0-not satisfied, 1-somewhat dissatisfied, 2-satisfied, 3-very satisfied. The
variable recorded is an example of what type of variable?: a variable measured on the ordinal
scale.
21.The city would like to conduct a study of the opinions of its residents on an upcoming election.
Since it would be too costly to call every person who is registered to vote in the city they decide to
call every 15th person in the records database. Which of the following is correct?: The study is a
sample survey.
22.Data mining is the process of uncovering hidden information that can be used to: predict
23. Consider the following data as well as the corresponding st display on the
annual property taxes for eight residents of a city em-and-leaf
.: 100
24.Which of the following statements is true with respect to bar charts?: A bar chart can be used
for a data set with a relatively small number of possible categories.
25.The sum of the frequencies for all classes will always equal: the number of elements in a data
set
26. Information on the number of new teachers hired in a school each of 4 years is district
given in the table below.
for
The percent frequency of new hires in 1998 is:: 40%
27. Which of the following cannot be conveyed using a stem-and-leaf display? (Assume that the
entire values are used in creating the stem-and-leaf display.)-
: The order in which the observations were taken
28. The number of sick days taken (per month) by 150 factory wo summarized rkers
below. is
The cumulative frequency for the class 11 - 15 is:: 145
29. Consider the scatter diagram below.
