If 90% of all the possible sample means fall within an area on a graph, what can you conclude?

You can be 90% confident you have captured the true µ.

What is the margin of error (E)?

An estimate of the max amount of difference that we think is possible.

What is a Confidence Level?

Specifies the probability that the pop. parameter WILL lie within range.

What is a Point Estimate?

A single statistic that is used as best estimate of unknown pop. parameter.

What is Random Sampling?

Every member of the population of interest has an equal chance of selection

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Confidence Intervals Quiz

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Answers

1
The higher the level of confidence, the shorter the confidence interval.
False
True
2
If 90% of all the possible sample means fall within an area on a graph, what can you conclude?
You can be 90% confident you have captured the true µ.
That you are 100% sure and can conclude facts about the population.
You have to reject all the information from the study.
You can be 10% confident you have captured the true µ.
3
A researcher selects a sample of 18 participants observed two times. What is the df for this sample?
15
18
17
16
4
What is the margin of error (E)?
An estimate of the max amount of difference that we think is possible.
I honestly have no idea.
A range of values within which the population parameter is likely to fall.
A gap between sample statistics and population parameters.
5
An estimated Cohens d substitutes which in the formula to estimate population standard deviation for one-sample t-test.
population standard deviation
population mean
sample mean
sample standard deviation
6
What is a Confidence Level?
Garfield
Specifies the probability that the pop. parameter WILL lie within range.
Specifies a range of values within to estimate the pop. parameter.
A type of statistic that specifies range of values.
7
What is the crit. value of a 2 tailed test with an α = .05; Find the difference between 2 schools, 15 students each.
+/- 1.701
+/- 2.889
+/- 2.467
+/- 2.048
8
What happens to the range when you change a 95% Confidence Interval to a 99% Confidence Interval
It stays the same
It decreases
It increases
It turns into a circle
9
What is a Point Estimate?
A range of valyes within which the population parameter is likely to fall.
A single statistic that is used as best estimate of unknown pop. parameter.
idk
A type of inferential statistic that specifies a range of values.
10
what is the denominator for estimated Cohen's d for a one sample t-test?
estimated standard error
population standard deviation
sample standard deviation
mean
11
A ________ is a type of inferential statistic that specifies a range of values used to estimate an unknown parameter.
Confidence Level
Margin of Error
Sampling Error
Confidence Interval
12
What is Random Sampling?
Using a 2-tailed test
Every member of the population of interest has an equal chance of selection
You hire more people with the same name to do a study.
You have to use the Unit Normal Table
13
What are the three most used levels of confidence?
85%, 95%, 100%
50%, 65%, 75%
50%, 100%, 200%
90%, 95%, 99%

Confidence Intervals Quiz Flashcards | StudBud