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Sampling Distributions / Confidence Interval Flashcards | StudBud

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Sampling Distributions / Confidence Interval

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Questions 10

Answers

1
Do a majority of Americans prefer Joe Biden?
We can't tell we didn't ask them.
No, our interval is less than 50
No, our interval is bellow 0.95
Yes, our interval is less than 50.
2
What is the point estimate for this confidence interval?
0.392
0.448
0.42
42.8
3
What is a confidence interval?
The interval between the means of two paired tests
The probability of a result being representative for a global population
The range of possible results from a test
The chance of a test result to be positive when the outcome is uncertain
4
As the confidence level increases, the confidence interval ______________ ?
decreases
narrows
widens
doesn't change
5
When is a binomial distribution, with n trials and a probability of p, approximately normal?
n\cdot p\ge10 and n\left(1-p\right)\ge10
n\ge30
n\cdot p=n\left(1-p\right)
When the expected results are skew.
6
Margin of error
Shows how accurate we believe our estimate is
Tells us that we have made a mistake in our calculation
Should be eliminated totally
None of the above
7
In normal distribution curve, sampling values following:
Mean=Variant
Mean=Median
Mean=S.D
Mean= 2 x median
8
A Sampling Distribution has
all the statistics in a parameter
all sample statistics of sample size n
all sample statistics collected
all possible samples of all sample sizes
9
What are sampling distributions?
Distributions of samples
Distributions of sample statistics
Distributions of populations
Distributions of parameters
10
For proportions, at what point does a majority start?
p>0.5
0.25\le p\le0.75
p\ge0.95
p\ge0.5