MCCC INTRO TO STATISTICS EXAM
QUESTIONS AND CORRECT ANSWERS!!
After constructing a relative frequency distribution summarizing IQ scores of college
students, what should be the sum of the relative frequencies?
If percentages are used, the sum should be 100%. If proportions are used, the sum should be 1.
Among fatal plane crashes that occurred during the past 70 years, 269 were due to pilot
error, 54 were due to other human error, 665 were due to weather, 85 were due to
mechanical problems, and 479 were due to sabotage.
Construct the relative frequency distribution. What is the most serious threat to aviation
safety, and can anything be done about it?
What is the relative frequency for pilot error, other human error, weather, mechanical
problems, and sabotage? Round to one decimal point.
What is the most serious threat to aviation safety, and can anything be done about it?
Pilot Error: 17.3%
Other Human Error: 3.5%
Weather: 42.8%
Mechanical problems: 5.5%
Sabotage: 30.9%
Weather is the most serious threat to aviation safety. Weather monitoring systems could be
improved. Whi
Which characteristic of data is a measure of the amount that the data values vary?
a. variation
b. distribution
, c. time
d. center
variation
- are sample values that lie very far away from the majority of the other sample values.
outliers
A -- helps us understand the nature of the distribution of a data set.
frequency distribution
Class width is found by -------.
subtracting a lower class limit from the next consecutive lower class limit
In a -- distribution, the frequency of a class is replaced with a proportion or percent.
relative frequency
The population of ages at inauguration of all U.S. Presidents who had professions in the
military is 62, 46, 68, 64, 57. Why does it not make sense to construct a histogram for this
data set?
With a data set that is so small, the true nature of the distribution cannot be seen with a
histogram.
Listed below are blood groups of O, A, B, and AB of randomly selected blood donors.
Construct the relative frequency distribution.
AOOOOAAOAO
O A A O O AB O A B A
AB O A O B O O AB A A
AB A O A B O AB O O O
Find the relative frequency for O, A, B, AB
QUESTIONS AND CORRECT ANSWERS!!
After constructing a relative frequency distribution summarizing IQ scores of college
students, what should be the sum of the relative frequencies?
If percentages are used, the sum should be 100%. If proportions are used, the sum should be 1.
Among fatal plane crashes that occurred during the past 70 years, 269 were due to pilot
error, 54 were due to other human error, 665 were due to weather, 85 were due to
mechanical problems, and 479 were due to sabotage.
Construct the relative frequency distribution. What is the most serious threat to aviation
safety, and can anything be done about it?
What is the relative frequency for pilot error, other human error, weather, mechanical
problems, and sabotage? Round to one decimal point.
What is the most serious threat to aviation safety, and can anything be done about it?
Pilot Error: 17.3%
Other Human Error: 3.5%
Weather: 42.8%
Mechanical problems: 5.5%
Sabotage: 30.9%
Weather is the most serious threat to aviation safety. Weather monitoring systems could be
improved. Whi
Which characteristic of data is a measure of the amount that the data values vary?
a. variation
b. distribution
, c. time
d. center
variation
- are sample values that lie very far away from the majority of the other sample values.
outliers
A -- helps us understand the nature of the distribution of a data set.
frequency distribution
Class width is found by -------.
subtracting a lower class limit from the next consecutive lower class limit
In a -- distribution, the frequency of a class is replaced with a proportion or percent.
relative frequency
The population of ages at inauguration of all U.S. Presidents who had professions in the
military is 62, 46, 68, 64, 57. Why does it not make sense to construct a histogram for this
data set?
With a data set that is so small, the true nature of the distribution cannot be seen with a
histogram.
Listed below are blood groups of O, A, B, and AB of randomly selected blood donors.
Construct the relative frequency distribution.
AOOOOAAOAO
O A A O O AB O A B A
AB O A O B O O AB A A
AB A O A B O AB O O O
Find the relative frequency for O, A, B, AB
