Question 1
Let x represent the height of first graders in a class. This would be considered what type of variable:
A)Continuous
B)Discrete
C)Nonsensical
D)Lagging
Question 2
Let x represent the height of corn in Oklahoma. This would be considered what type of variable:
A)Continuous
B)Inferential
C)Distributed
D)Discrete
Question 3
Consider the following table.
Age Group Frequency
18-29 9831
30-39 7845
40-49 6869
50-59 6323
60-69 5410
70 and over 5279
If you created the probability distribution for these data, what would be the probability of 18-29?
A)42.5%
B)23.7%
C)18.9%
D)16.5%
Question 4
Consider the following table.
Weekly hours worked Probability
1-30 (average=23) 0.08
31-40 (average=36) 0.10
41-50 (average=43) 0.74
51 and over (average=54) 0.08
Find the mean of this variable.
A)25.2
B)41.6
C)31.8
D)39.0
Question 5
Consider the following table.
Defects in batch Probability
0 0.28
1 0.35
2 0.16
3 0.09
4 0.10
5 0.02
Find the variance of this variable.
A)1.83
B)1.44
C)1.35
D)0.85
Question 6
Consider the following table.
Defects in batch Probability
2 0.15
3 0.44
4 0.18
5 0.10
6 0.07
7 0.06
Find the standard deviation of this variable.
A)1.86
B)0.93
C)1.36
D)3.68
Question 7
The standard deviation of samples from supplier A is 0.0841, while the standard deviation of samples from supplier B is 0.0926. Which supplier would you be likely to choose based on these data and why?
A)Supplier B, as their standard deviation is higher and, thus, easier to fit into our production line
B)Supplier A, as their standard deviation is lower and, thus, easier to fit into our production line
C)Supplier A, as their standard deviation is higher and, thus easier to fit into our production line
D)Supplier B, as their standard deviation is lower and, thus, easier to fit into our production line
Question 8
Ten frequent gamers are randomly selected. The random variable represents the number of frequent gamers who play video games on their smartphones. For this to be a binomial experiment, what assumption needs to be made?
A)The probability of being selected is the same for all ten gamers
B)The probability of being a gamer and is selected is the same for all gamers
C)All ten selected gamers are the same age
D)The probability of being a gamer that plays video games on their smartphones is the same for all gamers
Question 9
A survey found that 39% of all gamers play video games on their smartphones. Ten frequent gamers are randomly selected. The random variable represents the number of frequent games who play video games on their smartphones. What is the value of p?
A)10
B)0.10
C)0.39
D)x, the counter
Question 10
Sixty-eight percent of US adults have little confidence in their cars. You randomly select eleven US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly eight and then find the probability that it is (2) more than 6.
A)(1) 0.247 (2) 0.744
B)(1) 0.753 (2) 0.256
C)(1) 0.247 (2) 0.256
D)(1) 0.753 (2) 0.744