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 Financial CFA Level 1 exam with other users:
good questions with simple explanation
admin guide (windows) respond to malicious causality chains. when the cortex xdr agent identifies a remote network connection that attempts to perform malicious activity—such as encrypting endpoint files—the agent can automatically block the ip address to close all existing communication and block new connections from this ip address to the endpoint. when cortex xdrblocks an ip address per endpoint, that address remains blocked throughout all agent profiles and policies, including any host-firewall policy rules. you can view the list of all blocked ip addresses per endpoint from the action center, as well as unblock them to re-enable communication as appropriate. this module is supported with cortex xdr agent 7.3.0 and later. select the action mode to take when the cortex xdr agent detects remote malicious causality chains: enabled (default)—terminate connection and block ip address of the remote connection. disabled—do not block remote ip addresses. to allow specific and known s
very inciting
question 5, it seems a instead of d, because: - care plan = case - patient = person account - product = product2;
it look like real one
i am taking oracle fcc certification test next two days, pls share question dumps
i need dumps
its time to comptia sec+
question 35 has an answer for a different question. i believe the answer is "a" because it shut off the firewall. "0" in registry data means that its false (aka off).
helpful content
oracle 19c is complex db
helpful for practice
support team is fast and deeply knowledgeable. i appreciate that a lot.
helpful questions
thanks for question
the software is provided for free so this is a big change. all other sites are charging for that. also that fucking examtopic site that says free is not free at all. you are hit with a pay-wall.
i need exam questions nca 6.5 any help please ?
just took the comptia cybersecurity analyst (cysa+) - wished id seeing this before my exam
very helpful
i need this exam
nice questions... are these questions the same of the exam?
need to view
highly appreciate for your sharing.
kindly share this dump. thank you
link plz for download
data quality oecd
rman is one good recovery technology
need it thx
good questions
good one nice revision
i love this thank you i need
question # 142: data governance is not one of the deliverables in the document and content management context diagram.
most answers not correct here
what % of questions do we get in the real exam?