Answer :
The number of degrees of freedom is 29.
What is degree of freedom?
A degrees of freedom inside a statistical method describe how many values in a computation can vary. The degrees of freedom of chi-square tests, t-tests, and even more complex f-tests can be calculated to assist confirm their statistical validity.
These tests are frequently used to have a data with the data that would anticipated to be obtained if a given hypothesis were followed.
Degrees of Freedom Formula:
The statistical formula for determining degrees of freedom is straightforward. It is written as follows: degrees of freedom are the number of values in such a data set minus one.
df = N-1
Where N denotes the total number of items in the data collection (sample size).
Now according to the question,
Its degrees of freedom will be determined using the method df = N-1:
df = 30-1 = 29 appears in this case.
This means that in this data collection, three integers can vary as long even as mean remains 20.
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