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ECON 230- Final Exam Questions And Answers With Verified Solutions 100% Correct!!!
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ECON 230- Final Exam Questions AndAnswers With Verified Solutions 100%
Correct!!!
Which of the following is a quantitative variable? - ANSWER✔✔a.Favorite food
b. Types of birds seen at a feeder
c. Weight loss
d. Albums in a collection
Answer: C
Categorical data - ANSWER✔✔are measurements that cannot be measured on a
natural numerical scale
EXAMPLE: favorite food
quantitative data - ANSWER✔✔measurements that are recorded on a naturally
occurring numerical scale.
Zip Code consist of numeric values. Zip Code is an example of - ANSWER✔✔a. a
quantitative variable.
b. either a quantitative or a categorical variable.
c. an exchange variable.
d. a categorical variable
,Answer: D
Categorical, because they cannot be meaningfully added, subtracted, multiplied, or
divided
A safety inspector conducts air quality tests on a randomly selected group of 7
classrooms at a high school. Identify the population and sample in this setting. -
ANSWER✔✔population: all classrooms at the highschool
sample: the 7 classrooms selected
Stem. Leaf
----- -----
123
201558
3469
534446
6256678
8035
98
What are the mean, median, and mode for the stem and leaf plot? -
ANSWER✔✔mean= 50.56
(The total number of values recorded in the stem and leaf plot is the number of
leaves = 25 The values written out in full are: 12, 13, 20, 21, 25, 25, 28, 34, 36, 39,
53, 54, 54, 54, 56, 62, 65, 66, 66, 67, 68, 80, 83, 85, 98 So the mean = (12 + 13 +
20 + 21 + 25 + 25 + 28 + 34 + 36 + 39 + 53 + 54 + 54 + 54 + 56 + 62 + 65 + 66 +
66 + 67 + 68 + 80 + 83 + 85 + 98) ÷ 25 = 1,264 ÷ 25 = 50.56 (Note that this is not
the same as the mean of the stems plus the mean of the leaves)
, median= 54
mode= 54
The Los Angeles Times regularly reports the air quality index for various areas of
Southern California. A sample of air quality index values for Pomona provided the
following data: 28, 42, 58, 48, 45, 55, 60, 49, and 50.
a. Compute the range and interquartile range.
b. Compute the sample variance and sample standard deviation.
c. A sample of air quality index readings for Anaheim provided a sample mean of
48.5, a sample variance of 136, and a sample standard deviation of 11.66. What
comparisons can you make between the air quality in Pomona and that in Anaheim
on the basis of these descriptive statistics? - ANSWER✔✔a) Range = 60 - 28 = 32
IQR = Q3 - Q1 = 56.5 - 43.5 = 13
(Refer to study guide for steps on how to find IQR)
b) sample variance= 92.75
sample standard deviation= 9.65
(refer to study guide on how to find solution)
(Chebyshev's Theorem)
In a statistics class, the average grade on the final examination was 75 with a
standard deviation of 5. If nothing is known about the shape of the distribution,
answer the following questions.
a. At least what percentage of the students received grades between 50 and 100?
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