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.
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very good questions
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the exam is listed as 80 questions with a pass mark of 70%, how is your 50 questions related?
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q 44. ans:- b (goto setup > order settings > select enable optional price books for orders) reference link --> https://resources.docs.salesforce.com/latest/latest/en-us/sfdc/pdf/sfom_impl_b2b_b2b2c.pdf(decide whether you want to enable the optional price books feature. if so, select enable optional price books for orders. you can use orders in salesforce while managing price books in an external platform. if you’re using d2c commerce, you must select enable optional price books for orders.)
"cost of replacing data if it were lost" is also correct.
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question 182 - correct answer is d. ethernet frame length is 64 - 1518b. length of user data containing is that frame: 46 - 1500b.
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took the test last week, i did have about 15 - 20 word for word from this site on the test. (only was able to cram 600 of the questions from this site so maybe more were there i didnt review) had 4 labs, bgp, lacp, vrf with tunnels and actually had to skip a lab due to time. lots of automation syntax questions.
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question #50 and question #81 are exactly the same questions, azure site recovery provides________for virtual machines. the first says that it is fault tolerance is the answer and second says disater recovery. from my research, it says it should be disaster recovery. can anybody explain to me why? thank you