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Statistics Midterm Review
Test Description: Statistics basics
Instructions: Answer all questions to get your test result.
1) Find the mean: 3, 5, 6, 11, 11
A
8.3
B
5.1
C
6.4
D
7.2
2) Find the quartiles: 3, 5, 6, 11, 11
A
Q1=5, Q2=6, Q3=8
B
Q1=2, Q2=6, Q3=12
C
Q1=4, Q2=6, Q3=11
D
Q1=3, Q2=5, Q3=11
3) In a bag of marbles, there are 4 red marbles, 6 blue marbles, and 2 yellow marbles. What is the probability of choosing a yellow marble?
A
0.67
B
0.17
C
0.25
D
0.83
4) Does choosing a 4-digit PIN involve a combination or permutation?
A
permutation
B
combination
C
neither
D
idk
5) How many different ways can you choose a 4-digit PIN?
A
8300
B
40
C
210
D
5040
6) Let X = number of die rolls it takes to roll a 6. Is X a binomial variable?
A
no
B
yes
C
what's a binomial variable?
D
not enough information
7) Let X = number of die rolls it takes to roll a 6. Is X a geometric variable?
A
yes
B
not enough information
C
no
D
what's a geometric variable?
8) A set of data with a mean of 17 and standard deviation of 2 is normally distributed. What two values do 99.7% of the data lie between?
A
13-21
B
15-19
C
9-25
D
11-23
9) A set of data with a mean of 17 and standard deviation of 2 is normally distributed. Find the z-score for 20.
A
2.5
B
-2.5
C
1.5
D
-1.5
10) A set of data with a mean of 17 and standard deviation of 2 is normally distributed. Find the z-score for 12.
A
-2.5
B
1.5
C
-1.5
D
2.5
*select an answer for all questions
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