Math Problem Statement
Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts (a) through (c) below.
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TInterval
(13.046,22.15)
x overbarxequals=17.598
Sxequals=16.01712719
nequals=50
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Part 1
a. What is the number of degrees of freedom that should be used for finding the critical value
t Subscript alpha divided by 2tα/2?
dfequals=enter your response here
(Type a whole number.)
Part 2
b. Find the critical value
t Subscript alpha divided by 2tα/2
corresponding to a 95% confidence level.
t Subscript alpha divided by 2tα/2equals=enter your response here
(Round to two decimal places as needed.)
Part 3
c. Give a brief general description of the number of degrees of freedom.
A.
The number of degrees of freedom for a collection of sample data is the number of sample values that can vary after certain restrictions have been imposed on all data values.
B.
The number of degrees of freedom for a collection of sample data is the total number of sample values.
C.
The number of degrees of freedom for a collection of sample data is the number of unique, non-repeated sample values.
D.
The number of degrees of freedom for a collection of sample data is the number of sample values that are determined after certain restrictions have been imposed on all data values
Solution
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Math Problem Analysis
Mathematical Concepts
T-distribution
Confidence intervals
Degrees of freedom
Formulas
Degrees of freedom calculation: df = n - 1
Theorems
-
Suitable Grade Level
Advanced High School
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