You are interested in the number of English-speaking people on the planet who want to play a new kind of online video game. You asked 300 college students if they were interested in playing video games, 100 said yes, and
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You are interested in the number of English-speaking people on the planet who want to play a new kind of online video game. You asked 300 college students if they were interested in playing video games, 100 said yes, and of them 20 preferred your game to an existing game that is widely used.
How many people were in the sample?
Select one:
a. The number of English-speaking people on the planet who want to play a new kind of online video game.
b. 300
c. 200
d. 100
e. 20 Ans: E
Question 2
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Question text
What is the mean of x?
x <- c(12, 14, 11, 14, 13, 15, 12, 16, 10)
Select one:
a. 12
b. 13
c. 14
d. 15
e. 16 ANS: B
Question 3
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Question text
Using the value of x from the prior question, what is the standard deviation of x? Select one:
a. 1
b. 3.75
c. 9
d. sqrt(13)
e. 1.94 ANS: E
Question 4
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Question text
There was a very short quiz with five questions. The following table shows the number of correct answers and the cumulative relative frequency for those scores in the class.
value:
2
3
4
5
cumulative relative frequency:
.13
.55
.925
1
What is the probability that a randomly selected student from the class scored a 3 on the short quiz?
Select one:
a. .13
b. .42
c. .55
d. .375
relative frequency:
.17
.11
.23
.15
Question 5
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Question text
What is the missing value in the list of relative frequencies for random variable L? Select one:
a. .34
b. .23
c. .19
d. .17
e. .11 ANS: A
Question 6
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Question text
What is the probability that a randomly selected item from random variable L will be greater than 0 and less than or equal to 3?
Select one:
a. .00
b. .57
c. .23
d. .85
e. 1 ANS: C
Question 7
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Question text
What is the expectation of random variable L? Select one:
a. .00
b. .23
c. 1.14
d. 1.60
e. 1.83 ANS:D
Question 8
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Question text
What is the variance of random variable L? Select one:
a. 1.60
b. 2.30
c. 3.46
d. 7.23
e. 14.58 ANS:E
Question 9
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Question text
Which distributions are discrete? Select one:
a. the normal distribution and the Poisson distribution.
b. the Poisson distribution, the binomial distribution, and the uniform distribution.
c. the binomial distribution and the exponential distribution.
d. the Poisson distribution, the binomial distribution, and the normal distribution.
e. none of the answers above are accurate
From prior experience, you know that the probability of success (popping a balloon) for each dart is .15.
ANS:B
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