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MATH 1680 Final Exam Review Flashcards | StudBud
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MATH 1680 Final Exam Review
MATH 1680 Final Exam Review
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1
You divide the population into large groups, then randomly select individuals from each group. Sampling method?
Random sampling
Systematic sampling
Stratified sampling
Cluster sampling
2
The standard normal distribution is centered at mu = 0.
False
True
3
A residual is calculated as: Observed value - Predicted value
True
False
4
What should all values in a relative frequency column total up to?
100
It depends on the frequencies
1
0
5
What is the area under the standard normal curve that lies to the left of the z-score 0.71?
0.72907
0.76115
0.62930
0.55567
6
The Empirical Rule tells us that ____ of the area under a normal curve lies within 1 standard deviation of the mean.
70%
99.7%
68%
95%
7
A spinner has 8 regions labeled from 1 to 8. We spin the spinner five times. What is the probability all spins are odd?
1/2
31/32
1/8
1/32
8
What happens to the graph of the normal curve as the mean increases?
The graph of the normal curve compresses and becomes steeper.
The graph of the normal curve flattens out and becomes wider.
The graph of the normal curve slides left.
The graph of the normal curve slides right.
9
Which statistics rule states: "As sample size increases, the distribution becomes more normal (bell-shaped) and narrow"
Central Limit Theorem
Law of Large Numbers
Complement Rule
Empirical Rule
10
In a binomial experiment, the number of successes can be greater than the number of trials.
False
True
11
In the binomial probability formula, what does the parameter
p
denote?
Probability of failure
Number of trials
Probability of success
Number of successes
12
An exam's test scores are normally distributed with mu = 85 and st dev = 4. About 68% of the data lies within?
(73, 97)
(81, 89)
(77,93)
(75, 99)
13
Suppose that E and F are two events and thatP(E and F) = 0.48 and P(E) = 0.5. What is P(F|E)?
0.24
0.96
0.43
0.53
14
The Empirical Rule tells us that ____ of the area under a normal curve lies within 2 standard deviations of the mean.
99.7%
95%
97%
68%
15
Classify the following variable: Number of students enrolled in Math 1680
Quantitative Continuous
Qualitative
Quantitative Discrete
None of the above
16
If you are in the 40th percentile for height, you are _____ than 40% of those surveyed.
Shorter
Richer
Taller
Faster
17
Which of the following is
not
part of the five number summary?
Mean
Maximum
Minimum
Median
18
The events A and B are mutually exclusive. If P(A) equals=0.1 andP(B) equals=0.7, what is P(A or B)?
0.7
0
0.6
0.8
19
What level of measurement is height?
Interval
Ordinal
Ratio
Nominal
20
What is the preferred measure of center for bell-shaped distributions?
Mode
Standard Deviation
Mean
Median
21
What happens to the graph of the normal curve as the standard deviation decreases?
The graph of the normal curve flattens out and becomes wider.
The graph of the normal curve slides left.
Nothing happens to the graph of the normal curve.
The graph of the normal curve compresses and becomes steeper.
22
What value of the correlation coefficient r best fits the given linear relationship?
0.82
0.92
0.22
-0.82
23
How do we find the mode of a data set?
Count every time a value appears and find the most frequent value(s)
Add all values in a data set and then divide by the number of values
Sort all values from smallest-largest and find which value is in the middle
24
A travel researcher interviews all of the passengers on 5 randomly selected cruises. What sampling technique is used?
Stratified
Simple Random Sampling
Systematic
Cluster
25
How is the interquartile range (IQR) calculated?
Q3 - Q1
Q1 - Q3
Maximum - Minimum
Q2 - Q1
26
Approximately 99.7% of the area under the normal curve is within __ standard deviation(s) of the mean
3
2
1
4
27
Which of these correlation coefficients shows the strongest correlation between two variables?
r = -0.31
r = 0.77
r = -0.94
r = 0.42
28
Describe the shape of this distribution
Left skewed
Bell shaped/unimodal
Right skewed
Uniform
29
If A and B are mutually exclusive events, then P(A and B) = 0.
False
True
30
If two variables have a very strong correlation, we can assume causation between the variables.
True
False
31
In an observational study, the explanatory variable is
not
manipulated/influenced by the researchers.
True
False
32
What happens to margin of error when the sample size increases?
Margin of error will increase
Margin of error will decrease
No change
33
Which of these is the complement rule of probability?
P(A’) = 1 – P(A)
P(A and B) = P(A) * P(B)
P(A and B) = P(A|B) * P(B)
P(A or B) = P(A) + P(B) - P(A and B)
34
When reading the Z-table, the area in the table refers to the area to the _____ of the z-score.
Right
Left
35
As we increase our level of confidence, our confidence interval gets...
It doesn't change
Wider
Narrower
36
In the binomial probability formula, what does the variable
x
denote?
Number of trials
Number of successes
Probability of success
Probability of failure
37
What level of measurement is temperature? (in Fahrenheit)
Ratio
Interval
Ordinal
Nominal
38
When should I use the T distribution?
When true standard deviation is unknown
When N < 30
Both A & B
None of the above
39
As the sample size increases, the sampling distribution becomes _______________ the normal distribution.
There's no change in the shape of distribution
Closer to
Farther away from
40
The graph below shows 3 normal distributions, labeled A, B, and C. Which one has the largest standard deviation?
B
C
A
41
What is the preferred measure of center for left/right skewed distributions?
Mean
Mode
Median
Standard Deviation
42
Is age an example of discrete or continuous data?
Continuous
Discrete
