A random variable, X, has a mean of 10 and a standard deviation of 15. Another random variable, Y, is defined by Y = 2X + 3. Then, which of the following is/are true? I. The mean of Y is 33. II. The variance of Y is 30. III. The standard deviation of Y is 33. IV. X and Y are perfectly correlated.
Answer(s): E
The mean of Y is 2*10 + 3 = 23. The standard deviation of Y is 2*15 = 30. Its variance is then equal to 30^2 = 900. Finally, since Y is a linear multiple of X, X and Y are perfectly correlated (positively, in this case)
A systematic sampling method should not be used when:
Answer(s): C
If the data are already arranged in the form of a predetermined pattern, using systematic sampling can introduce a systematic pattern in the sample itself, which would lead to erroneous inferences about the entire population.
What is the relationship between the variance and the standard deviation?
The variance is the mean of the squared deviations from the mean. The standard deviation is the positive square root of the variance.
A bell-shaped, symmetrical frequency distribution has a mean of 5 and a standard deviation of 2.5. The percentage of observations less than zero is about:
Answer(s): D
Note that the mean is 2 standard deviations above zero. The fraction of observations in a bell-shaped, symmetrical frequency distribution which lie outside the 2-sigma range around the mean is about 5%. Since the distribution is symmetrical about the mean, the percentage of observations less than zero is approximately equal to 5%/2 = 2.5%.
What is the area under the normal curve between z = 1.0 and z = 2.0?
Answer(s): B
From the z-tables, z = 1 is 0.3413 and z = 2 is 0.4772. So the area in between is 0.4772 - 0.3413 = 0.1359.
Share your comments for CFA CFA I exam with other users:
q10 - the answer should be a. if its c, the criteria will meet if either the prospect is not part of the suppression lists or if the job title contains vice president
this was on the exam as of 1211/2023
great for prep
i think in question 7 the first answer should be power bi portal (not power bi)
on question 10 and so far 2 wrong answers as evident in the included reference link.
wonderful material
i passed!! ...but barely! got 728, but needed 720 to pass. the exam hit me with labs right out of the gate! then it went to multiple choice. protip: study the labs!
correct answer for question 92 is c -aws shield
great !! it is really good
explanations for the answers are to the point.
how can rea next
question: 128 d is the wrong answer...should be c
thanks for az 700 dumps
thank you for this tableau dumps . it will helpfull for tableau certification
good content
just testing if the comments are real
very helpful for exam preparation
question 11: https://help.salesforce.com/s/articleview?id=sf.admin_lead_to_patient_setup_overview.htm&type=5
i think the answer to question 42 is b not c
thanks for the dump
fantastic assessments
i find the xengine test engine simulator to be more fun than reading from pdf.
nice document
thank you for making the questions and answers intractive and selectable.
answers are correct?
can i belive this dump
great site to practice for sitecore exam
good for students
nice practice dumps
nokia 4a0-114 dumps
great content and wonderful to have the answers with explanation
for question #118, the answer is option c. the screen shot is showing the drop down, but the answer is marked incorrectly please update . thanks for sharing such nice questions.
the correct answer for the question 29 is d.
question no 22: correct answers: bc, 1 per session 1 per page 1 per component always