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Chapter 4 Review (1040 Summer) Flashcards | StudBud
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Chapter 4 Review (1040 Summer)
Chapter 4 Review (1040 Summer)
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Review Created for Chapter 3 of Introduction to Statistics at SLCC.
Flashcards
34 cards
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Questions
34
Answers
1
What is the shape of this Histogram?
Uniform
Skewed Left
Skewed Right
Symmetric (Bell Shaped)
2
RE2: Given the following output, interpret a 95% confidence interval.
We are 95% confident that the interval contains the true prop. of states.
We are 95% confident the true mean # of states is in the interval.
We are 95% confident that the interval contains the true mean # of states.
There is a 95% probability the interval contains the true mean # of states.
3
RE1: Why is the Central Limit Theorem verified?
It isn't!
The Population is Normally Distributed
144 ≥ 30
144 ≥ 30 and the Pop. is Normal are BOTH true, though we only need one
4
RE2: To calculate a 95% Confidence Interval for the true mean number of states visited, which option do we select?
T Test of a Mean
T Test, Difference of Means
T Estimate, Difference of Means
T Estimate of a Mean
5
RE1: Finish the interpretation of this probability: "If 100 samples of size 144 were obtained from this population..."
"... we would expect about 11 samples to have a mean of at most 120."
"... we would expect about 120 samples to have a mean of at least 0.105."
"... we would expect about 11 samples to have a mean of at least 120."
"... we would expect about 120 samples to have a mean of at most 0.105."
6
The value of the new Minimum is 58. Why do you believe that was selected as the new Minimum to replace the outlier?
58 was the value of the Lower Fence
58 was the next lowest value in the dataset that wasn't an outlier
My favorite number is 58
58 is the IQR
7
RE1: Why can we claim Independence?
5% of 144 people is 7.2, and we do have at least 7.2 people
144 people in the U.S. is likely more than 5% of all U.S. Citizens
We can't!
144 people in the U.S. is likely less than 5% of all U.S. Citizens
8
When comparing quant. data across two groups with Confidence Intervals, what is different about the Interpretation?
We say "true difference of means" instead of "true mean"
We don't need to put the confidence interval in context anymore
We say "___% Probability" instead of "___% Confidant"
The parameter comes before the interval in the statement
9
RE1: Why can we claim Randomness?
We can't!
This is an Experiment with randomly defined treatment and control groups
It says "Randomly Selected"
It doesn't say so, but it does say "survey", which implies randomness
10
RE1: If we want to find the probability that 144 people have a sample mean of at least 120, what are the inputs A and B?
Not enough information.
A = 120, B = 144
A = 120, B = Blank
A = Blank, B = 120
11
RE2: Which of the following conditions is
NOT
true about Review Example 2? (Note: all others are true)
We can assume the sample size is less than 5% of the population size
We know the Sample is Random
We know the Population is Normal
We know n\ge30
12
RE1: Find the mean of the Sampling Distribution.
117
0.8125
9.75
144
13
RE4: What are the Null and Alternative Hypotheses?
H_0:\mu=33 and H_A:\mu<33
H_0:\mu=35 and H_A:\mu>35
H_0:\mu=35 and H_A:\mu<35
H_0:\mu<35 and H_A:\mu>35
14
Based on this Statistics Output from GeoGebra, calculate the IQR.
21
3.5
6.5
10
15
If this output represents a sample, what is the value of the standard deviation (2 decimal places)?
6.76
6.47
16
What is the shape of this Stem Plot?
Uniform
Skewed Right
Skewed Left
Symmetric (Bell Shaped)
17
RE1: If we want to find the probability that 144 people have a sample mean of at least 120, which option should we use?
First option
Third Option
Fourth Option
Second Option
18
If IQR = 10, what is the value of the Lower and Upper Fences?
3 and 43
6.5 and 36.5
8 and 38
-1 and 50
19
I should create an 8.5 x 11 sheet of notes to have with me on the exam as part of my studying this weekend.
False
True
20
RE4: Given the following output, should we Reject or Fail to Reject if alpha is 0.05?
Fail to Reject because the p-value is less than alpha
Fail to Reject because the p-value is greater than alpha
Reject because the p-value is greater than alpha
Reject because the p-value is less than alpha
21
When comparing quant. data across two groups with Hypothesis Testing, what is different about the Hypotheses?
Nothing.
No number to compare, so we make hypotheses that compare the means
We set up seperate Hypothesis statements for each, two Null and two Alt
We can never know the direction of the test, so we ALWAYS use ≠
22
I should also study for my Reinforcement Topic assigned to me from Exam 1.
False
True
23
RE4: If we Reject the Null Hypothesis, which of the following is an appropriate conclusion?
We have insufficient evidence to claim the mean age is equal to 35
We have sufficient evidence to claim the mean age is equal to 35
We have sufficient evidence to claim the mean age of is below 35
We have insufficient evidence to claim the mean age is below 35
24
When comparing data across two groups with C.I., what implies there is
NO DIFFERENCE
between the population means?
When 0 is in the interval
When the entire interval is negative
When the entire interval is positive
When your p-value is greater than alpha
25
What is the approximate value of Q3 in this Boxplot?
24
72
90
84
26
When comparing quant. data across two groups, what is new about the conditions for normality?
We only need to know one sample is random, not both.
We also need to make sure the samples are independent of each other
We combine the samples and check if they are less than 10% of the pop.
We need to make sure both samples are less than 30, not greater than 30
27
If this output represents a sample, what is the value of the variance (1 decimal place)?
6.8
41.9
45.7
273
28
What is the shape of this Boxplot?
Skewed Left
Uniform
Symmetric (Bell Shaped)
Skewed Right
29
RE4: To calculate the test statistic and p-value for a Hypothesis Test, which option do we select?
T Estimate of a Mean
T Test, Difference of Means
T Test of a Mean
T Estimate, Difference of Means
30
RE3: What is the number of packages necessary?
30
6
9
36
31
What would be the best measure of CENTER to report for this distribution?
Mean
IQR
Standard Deviation
Median
32
RE2: To calculate a 95% confidence interval, what are the correct inputs in T Estimate of a Mean?
Level = 0.95, Mean = 7.2 s = 9.48, N = 40
Level = 0.90, Mean = 9.48, s = 7.2, N = 40
Level = 0.95, Mean = 9.48, s = 7.2, N = 40
Level = 0.95, Mean = 9.48, s = 7.2, N = 30
33
RE1: Find the standard error of the Sampling Distribution.
0.0667
9.6
0.8
115.2
34
What would be the best measure of VARIATION (or SPREAD) to report for this distribution?
Variance
Range
Standard Deviation
IQR
