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=17.598
Sx=16.01712719
n=50

What is the number of degrees of freedom that should be used for finding the critical value tα/2​?
df=nothing
​(Type a whole​ number.)