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Given that the population standard deviation is 6.8, what sample size is required to be 90% confident that the estimated mean has an error less than 0.02?
Suggested Answer: A
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15 comments · newest first
JO
Joaquin
11 months ago
B seems more reasonable, but I could be wrong.
DO
Dominga
12 months ago
Totally agree, the larger the sample, the better the accuracy!
MA
Matt
12 months ago
Wait, 312k? That seems way too high!
SO
Solange
12 months ago
I think it's A, 312,761 sounds right.
DE
Destiny
1 year ago
I feel like the sample size is going to be really large since the error is so small, but I’m not confident in my calculations.
WI
Willow
1 year ago
This question feels similar to one we practiced in class, but I can't recall the exact steps to calculate the sample size.
KE
Kenneth
1 year ago
I think we need to use the z-score for 90% confidence, which is around 1.645, but I’m not completely sure how to apply that here.
ME
Merrilee
1 year ago
I remember something about using the formula for sample size with standard deviation and margin of error, but I’m not sure if I got the numbers right.
LE
Leslee
1 year ago
I think the answer might be one of the lower options since the population standard deviation isn't that high, but I need to double-check my calculations.
TH
Thersa
1 year ago
I feel like the sample size is going to be really large since the error margin is so small, but I can't remember the specific calculations we practiced.
RU
Ruth
1 year ago
I think we need to use the formula involving the z-score for 90% confidence, but I'm a bit unsure about how to apply it here.
CL
Claribel
1 year ago
I remember we did a similar problem in class, but I can't recall the exact formula for calculating sample size.
MA
Maurine
1 year ago
Promoting responsibility throughout the enterprise for managing IT risk seems like the most logical primary motivation to me. That aligns with the overall purpose of an IT risk management framework.
ME
Melvin
1 year ago
Okay, let's think this through step-by-step. We need to recommend a solution to prevent PII from being shared, and the question mentions data loss prevention (DLP) policies and sensitivity label policies as potential components. I'm leaning towards those, but I'll double-check the other options as well.
OZ
Ozell
1 year ago
Hmm, this seems straightforward. I think the answer is B, k=10, since that's a common choice for k-fold cross-validation.