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Chapter 4 Review (1040) Flashcards | StudBud
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Chapter 4 Review (1040)
Chapter 4 Review (1040)
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1
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
My favorite number is 58
58 was the next lowest value in the dataset that wasn't an outlier
58 is the IQR
2
RE1: Why can we claim Randomness?
We can't!
It doesn't say so, but it does say "survey", which implies randomness
This is an Experiment with randomly defined treatment and control groups
It says "Randomly Selected"
3
RE1: Find the standard error of the Sampling Distribution.
115.2
9.6
0.8
0.0667
4
What would be the best measure of VARIATION (or SPREAD) to report for this distribution?
Range
Variance
Standard Deviation
IQR
5
RE1: Finish the interpretation of this probability: "If 100 samples of size 144 were obtained from this population..."
"... we would expect about 118 samples to have a mean of at most 0.105."
"... we would expect about 11 samples to have a mean of at least 118."
"... we would expect about 118 samples to have a mean of at least 0.105."
"... we would expect about 11 samples to have a mean of at most 118."
6
If this output represents a sample, what is the value of the variance (1 decimal place)?
6.8
45.7
41.9
273
7
RE1: Why is the Central Limit Theorem verified?
144 ≥ 30
The Population is Normally Distributed
144 ≥ 30 and the Pop. is Normal are BOTH true, though we only need one
It isn't!
8
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
9
RE1: Find the mean of the Sampling Distribution.
9.75
144
0.8125
117
10
What is the approximate value of Q3 in this Boxplot?
72
90
84
24
11
RE1: If we want to find the probability that 144 people have a sample mean of at least 118, which option should we use?
Second Option
Third Option
First option
Fourth Option
12
RE2: Given the following output, interpret a 95% confidence interval.
There is a 95% probability the interval contains the true mean # of states.
We are 95% confident that the interval contains the true mean # 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 prop. of states.
13
If this output represents a sample, what is the value of the standard deviation (2 decimal places)?
6.47
6.76
14
When comparing quant. data across two groups with Confidence Intervals, what is different about the Interpretation?
We say "___% Probability" instead of "___% Confidant"
We don't need to put the confidence interval in context anymore
We say "true difference of means" instead of "true mean"
The parameter comes before the interval in the statement
15
RE2: To calculate a 95% confidence interval, what are the correct inputs in T Estimate of a Mean?
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
Level = 0.95, Mean = 7.2 s = 9.48, N = 40
16
Based on this Statistics Output from GeoGebra, calculate the IQR.
6.5
10
3.5
21
17
What would be the best measure of CENTER to report for this distribution?
Standard Deviation
Mean
Median
IQR
18
I should create an 8.5 x 11 sheet of notes to have with me on the exam as part of my studying before Thursday.
False
True
19
RE1: Why can we claim Independence?
We can't!
5% of 144 people is 7.2, and we do have at least 7.2 people
144 people in the U.S. is likely less than 5% of all U.S. Citizens
144 people in the U.S. is likely more than 5% of all U.S. Citizens
20
RE4: What are the Null and Alternative Hypotheses?
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
H_0:\mu=33 and H_A:\mu<33
21
RE3: What is the number of packages necessary?
30
6
36
9
22
What is the shape of this Histogram?
Skewed Right
Uniform
Skewed Left
Symmetric (Bell Shaped)
23
When comparing quant. data across two groups, what is new about the conditions for normality?
We combine the samples and check if they are less than 10% of the pop.
We also need to make sure the samples are independent of each other
We only need to know one sample is random, not both.
We need to make sure both samples are less than 30, not greater than 30
24
If IQR = 10, what is the value of the Lower and Upper Fences?
3 and 43
6.5 and 36.5
-1 and 50
8 and 38
25
What is the shape of this Stem Plot?
Uniform
Symmetric (Bell Shaped)
Skewed Right
Skewed Left
26
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 Estimate, Difference of Means
T Test of a Mean
27
RE2: To calculate a 95% Confidence Interval for the true mean number of states visited, which option do we select?
T Estimate of a Mean
T Test of a Mean
T Test, Difference of Means
T Estimate, Difference of Means
28
I should also study for my Reinforcement Topic assigned to me from Exam 2.
True
False
29
When comparing quant. data across two groups with Hypothesis Testing, what is different about the Hypotheses?
We set up seperate Hypothesis statements for each, two Null and two Alt
Nothing.
No number to compare, so we make hypotheses that compare the means
We can never know the direction of the test, so we ALWAYS use ≠
30
What is the shape of this Boxplot?
Skewed Right
Skewed Left
Uniform
Symmetric (Bell Shaped)
31
RE1: If we want to find the probability that 144 people have a sample mean of at least 118, what are the inputs A and B?
Not enough information.
A = Blank, B = 118
A = 118, B = 144
A = 118, B = Blank
32
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 insufficient evidence to claim the mean age is below 35
We have sufficient evidence to claim the mean age of is below 35
33
55 random people were selected for a survey. What is the value of the Degrees of Freedom (df)?
95
55
54
56
34
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 greater than alpha
Fail to Reject because the p-value is less than alpha
Reject because the p-value is less than alpha
Reject because the p-value is greater than alpha
35
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 n\ge30
We know the Population is Normal
