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IASSC ICBB Exam - Topic 5 Question 92 Discussion

A valid mathematical Regression represents all of the characteristics shown except _________________.
A) All of the standardized residuals will be within 3 Standard Deviations
B) The sum of the residuals is zero
C) The residuals when plotted follow a Normal Distribution
D) Most standardized residuals are within 2 Standard Deviations
E) The Residual is equal to the difference between the observed and predicted values

IASSC ICBB Exam - Topic 5 Question 92 Discussion

Actual exam question for IASSC's ICBB exam
Question #: 92
Topic #: 5
[All ICBB Questions]

A valid mathematical Regression represents all of the characteristics shown except _________________.

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Suggested Answer: A

by Tanja at Jul 03, 2025, 10:04 AM

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Beckie
6 months ago
Not sure about that normal distribution thing... sounds off.
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Avery
6 months ago
Most standardized residuals should be within 2 SDs, right?
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Jesusita
6 months ago
The sum of the residuals is zero!
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Marlon
6 months ago
Totally agree, that's a key property.
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Truman
6 months ago
Wait, are all standardized residuals really within 3 SDs?
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Idella
7 months ago
I think option D is tricky because most standardized residuals being within 2 standard deviations seems like a common rule, but I'm not completely confident.
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Stephen
7 months ago
I practiced a similar question where we discussed the normal distribution of residuals, so I feel like option C could be misleading.
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Ilene
7 months ago
I'm not entirely sure, but I think the standardized residuals being within 3 standard deviations might not always hold.
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Paulene
7 months ago
I remember that the sum of the residuals should be zero, so I think option B is definitely true.
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Lenora
7 months ago
Wait, I'm confused. I thought most of the standardized residuals needed to be within 2 standard deviations, not 3. Let me double-check that before answering.
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Jimmie
8 months ago
I'm pretty confident on this one. The residuals following a normal distribution is a key assumption, so that can't be the answer. I'll go with A - all the standardized residuals should be within 3 standard deviations.
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Avery
8 months ago
Okay, I've got this. The key thing to remember is that the residuals should have a mean of zero. I think the answer is B - the sum of the residuals must be zero for a valid regression.
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Willard
8 months ago
Hmm, I'm a bit unsure about this one. I know the residuals should follow a normal distribution, but I'm not sure about the specifics of the standard deviations. I'll have to review my notes.
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Essie
8 months ago
This looks like a tricky question on the properties of a valid regression model. I'll need to think carefully about the key assumptions and characteristics.
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Miesha
10 months ago
Wait, is this a trick question? What if the answer is 'the model is perfectly accurate and has no residuals at all'?
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Izetta
10 months ago
D seems a little too lenient. I'd go with B - the sum of the residuals should be zero.
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Antonio
10 months ago
C looks good to me. The residuals should follow a normal distribution if the model is properly specified.
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Isaac
10 months ago
Hmm, I see your point. Maybe I was mistaken.
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Andrew
10 months ago
I agree with Cassi, C makes more sense.
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Cassi
10 months ago
But doesn't a valid regression require residuals to follow a Normal Distribution?
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Curtis
11 months ago
I think E is the correct answer. The residual is the difference between observed and predicted values - that's the whole point of regression!
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Isaac
11 months ago
I disagree, I believe it's C.
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Cassi
11 months ago
I think the answer is D.
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Claribel
11 months ago
Option A is definitely wrong. That's way too strict of a requirement for a valid regression model.
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Tamekia
11 months ago
Option C is also important, the residuals should follow a Normal Distribution.
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Corazon
11 months ago
I think option E is correct, the residual is the difference between observed and predicted values.
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Titus
11 months ago
I agree, option A is too strict for a valid regression model.
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