1. For a normally distributed set of scores, the 50th percentile
is equivalent to
a. the...
1. For a normally distributed set of scores, the 50th percentile
is equivalent to
a. the mean and the median of the raw scores
b. need more information
c. depends on the size of the standard deviation
d. depends on the variability of scores
2. All other things being equal, as the strength of the
relationship between two continuous variable increases
a. the SEE increases
b. prediction accuracy decreases
c. prediction is unaffected by the strength of the relationship
between...
There are two stocks, A and B, with means and standard
deviations of their monthly return...
There are two stocks, A and B, with means and standard
deviations of their monthly return are given below:
(5) What is the Sharpe ratio for each stock? (Sharpe
ratio=mean/sd)
(5) Which stock is a better investment in terms of Sharpe
ratio? Why?
(10) Assume the monthly return of Stock A is normally
distributed, what is the 1% value at risk (a dollar amount) if we
invest $200,000 in Stock A?
Stock
mean
Standard deviation
A
0.1%
2.23%
B
0.12%...
The following data set represents students' scores on a
quiz. The best possible score was a...
The following data set represents students' scores on a
quiz. The best possible score was a 20. Use the data to generate
answers to the next eight (8) questions (Q28-Q35).
4, 4, 10, 12, 2, 20, 5, 12, 12, 5, 9, 9, 20, 13, 6, 6,
15, 15, 15, 15
What is the mean? (Round all answers for this question to the
hundredths place - X.XX)
What is the median?
What is the mode?
What is the range?
What is...
Given independent random variables with means and standard
deviations as shown, find the mean and standard...
Given independent random variables with means and standard
deviations as shown, find the mean and standard deviation of each
of these variables:
Mean
SD
a) 4X
b) 4Y+3
c) 2X+5Y
X
70
14
d) 5X−4Y
e) X1+X2
Y
10
5
a) Find the mean and standard deviation for the random variable
4X.
E(4X)=_____________
SD(4X)=_______________
(Round to two decimal places as needed.)
b) Find the mean and standard deviation for the random variable
4Y+3.
E(4Y+3)= ________________
SD(4Y+3)= _____________________
(Round to...
The following data set represents test scores from a math class
at College A. Perform computations...
The following data set represents test scores from a math class
at College A. Perform computations as instructed below. If you have
decimals, use two or three decimal points in your answer.
Scores: 84, 79, 95, 65, 80, 76, 92, 88, 74, 90, 86,
72, 85
(a) What is the sum of the scores?
(b) What is the mean of the data set?
(c) What is the Sum of Squares (SS) of the data set?
(d) What is the variance...
Suppose your statistics professor reports test grades as
z-scores (standard scores), and you received a z-score...
Suppose your statistics professor reports test grades as
z-scores (standard scores), and you received a z-score of 2.2 on an
exam. This means your
Group of answer choices test score is 2.2 points higher than the
mean score in the class. test score is 2.2 points lower than the
mean score in the class. test score is 2.2 standard deviations
lower than the mean score in the class. test score is 2.2 standard
deviations higher than the mean score in...
Construct a probability distribution for the
following data set, which represents the number of hours of...
Construct a probability distribution for the
following data set, which represents the number of hours of
students in a college slept previous night. Let the random variable
x represent the number of hours of sleep.
Hours
4
5
6
7
8
9
10
Students
1
6
11
18
9
3
2
b) Calculate the expected value (mean), variance, and
standard deviation of the probability distribution.
Using R, answer the following question. The accompanying data
set contains quiz scores for 12 students...
Using R, answer the following question. The accompanying data
set contains quiz scores for 12 students in a chemistry class: 18,
15, 5, 8, 15, 20, 2, 16, 10, 12, 20, 15.
Find a measure of central tendency that separates the data into
two groups such that each group consists of 50% of the scores above
and 50% of the scores below that measure.
Find a measure of central tendency that represents the average
of the 12 quiz scores.
Find...
How many values are more than 2 standard deviations form the
mean in the following data...
How many values are more than 2 standard deviations form the
mean in the following data set:
10, 13, 15, 15, 18, 23, 29, 33, 35, 35, 35, 38,39, 45
a. find the mean and standard deviation of the following set of
ungrouped sample data: 4,...
a. find the mean and standard deviation of the following set of
ungrouped sample data: 4, 3, 5, 2, 3, 1, 2, 5, 3, 1, 5, 4, 6, 4, 5,
1, 3, 3, 7, 8, 7, 5, 4, 3, 7, 8, 4, 6, 9, 10, 10, 9, 6, 4, 6.
b. What proportion of the measurements lies within one standard
deviation of the mean? Within two standard deviations of the mean?
Within three standard deviations?
c. Based on part (b),...