MA116 Midterm 1 UPDATED ACTUAL Exam Questions and CORRECT Answers

MA116 Midterm 1 UPDATED ACTUAL
Exam Questions and CORRECT Answers
Skewed right-
1. Long ____ tail
2. Mean and median relationship

3. Box and whiskers plot - where is the median? - CORRECT ANSWER - 1. Right
2. Mean>Median
3. Toward right of box


Skewed left-
1. Long ____ tail
2. Mean and median relationship

3. Box and whiskers plot - where is the median? - CORRECT ANSWER - 1. Left
2. Mean<Median
3. Toward left of box


Independence rules (3) - CORRECT ANSWER - 1. P(A∩B) = P(A) * P(B)
2. P (A∩B/B) = P(A)
3. P (A∩B/A) = P(B)


True or false- Disjoint events are independent - CORRECT ANSWER - FALSE- not
always independent


Permutations rule- does order matter? replacement? - CORRECT ANSWER - Yes. Yes.


Permutations and combinations rule:
- N=

, - n= - CORRECT ANSWER - -N= Total elements
-n= # in group


Permutations formula - CORRECT ANSWER - (N!) / (N-n)!



Combinations rule- does order matter? replacement? - CORRECT ANSWER - No. No



Combinations formula - CORRECT ANSWER - (N!) / n! (N-n)!



Random variables (Mean, Standard Deviation) - CORRECT ANSWER - (sample mean,
σ/√n)


PDF- total area under curve= - CORRECT ANSWER -1


What is the probability that a continuous random variable is equal to any single point? -
CORRECT ANSWER -0


General normal v. standard normal distributions- relationship between mean, median, and mode -
CORRECT ANSWER - General normal: mean=median=mode
Standard normal: mean=median=mode=0


Qualities of a binomial distribution (4) - CORRECT ANSWER - -N IDENTICAL trials
-2 possible mutually exclusive outcomes
-P(success) remains the same form trial to trial
-Independent trials


Binomial distribution - CORRECT ANSWER - X~Bin (n,p)