EDCO 735 Quiz 2 27 of 30 6th attempt
The t distribution and the z distribution are all of the following all of the time except:
Correct Answer
Platykurtic Correct Answer
discovered or developed by statisticians
have values associated with percentiles
symmetrical
Warner - Section 2.8 - 2.14
In order to calculate variance you must:
divide the sum of squared deviations by df
divide the sum of scores by df
divide the sum of squared deviations by n
take the square-root of the sum of squared deviations
Question 1
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Question 2
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The t distribution and the z distribution:
have values associated with percentiles
are skewed
are random
have 95% confidence level
When different sets of data of the same size are randomly chosen from a population,
the resulting variation in values is called:
sampling error
standard deviation
magnitude of error
confidence interval
Question 5
Question 3
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Question 4
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3 / 3 pts
What is the formula for the df of a CI?
n - 1
M - 1
s - 1
SE
M
- 1
The t distribution and the z distribution are all of the following all of the time except:
normal
map to percentiles
symmetrical
discovered or developed by statisticians
N decreases the sampling distribution gets:
wider
Question 6
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Question 7
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more pointy
more leptokurtic
more representative
Sum of squared deviations:
can never be negative
can never be zero
has no lower limit
is divided by the sample size to calculate variance
A two-tailed outlier for the t distribution must have a t score equivalent to the:
highest 2.5% or lowest 2.5% of the t distribution
highest 5% or lowest 5% of the t distribution
Question 8
3 / 3 pts
Question 9
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Question 10
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only the highest 5% of the t distribution
only the lowest 5% of the t distribution
The standard error is related to all of the following except:
causal inference
dependent on sample size
is smaller with a larger sample
involves the confidence interval
