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Probability Review Flashcards | StudBud
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Probability Review
Probability Review
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Measures of variation and position.
Flashcards
18 cards
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Questions
18
Answers
1
500 college students are taking a statistics class, with a 46% chance of passing. Can this be a BINOMIAL DISTRIBUTION?
Yes, all requirements are met
No, at least one requirement is not met
2
What percentage of the women are between 61.29 and 69.42 inches tall? Mean is 64 inches and σ=2.71 inches
95%
68%
81.5%
15.85%
3
Which of these is a condition for using the binomial distribution?
The probability of success is fixed.
Events must be dependent.
There is a constant mean rate.
There are a random number of trials.
4
Binomial Distribution
Empty choice
Empty choice
5
Find the z-score for 80. The Statistics test mean was 78 and σ=2.5
0.8
0.2
1
-0.8
6
What percentage of women are between 66.71 and 69.42 inches tall? The mean is 64 inches and σ= 2.71 inches
13.5%
34%
68%
47.5%
7
What percentage of the women are between 58.58 and 69.42 inches tall? Mean is 64 inches & σ = 2.71 inches
95%
47.5%
68%
81.5%
8
Frank scored a 1150 on his SAT and Leah scored a 24 on her ACT. Who scored better?
Frank
Leah
They scored the same
9
Which of these test scores are unusual (above or below 3 standard deviations) given the following information?
82
73.5
88.5
81
10
What percentage of the data falls in the area shown?
99.7%
95%
68%
97%
11
Empirical Rule
between plus and minus two std dev= 95%
All of the above are true
between plus and minus 3 std dev= 99.7%
between plus and minus one std dev= 68%
12
What percentage of the data falls in the area shown?
68%
99.7%
95%
97%
13
Find the z-score for 69. The Statistics test mean was 78 and the σ= 2.5.
3.6
-2
-3.6
2.5
14
Consider the probability distribution below. (Probabilities are rounded.)
1 - 0.407
0.407 + 0.297
0.407
0.407 x 0.297
15
What is the empirical rule in normal distribution?
95% of data sits within 2 standard deviations of the mean
The results are able to be generalised to the population
95% of data sits within 2 standard deviations of the middle
The median will be exactly the same as the mean
16
What percentage of the data falls in the area shown?
95%
97%
99.7%
68%
17
When can the empirical rule be used?
Only when inside an empire
For bell shaped data
For all data sets
For skewed data
18
At a gym, 23% of the members used the pool for fun. If we sample 10 members, what is the probability 4 will be fun?
.94
.40
.23
.12
