Find the ratio of Cos (39). A. 37/7 B.X/7 C.7/X D.7
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The 70th percentile is the same as the cutoff recovery time 
such that every point above this time falls in the longest 30%, i.e.
Transform to the standard normal distribution:
where
is the z-score corresponding to the cutoff time , which is approximately 
. Solve for :
Transform to the standard normal distribution:
where
A null hypothesis illustrates that two variables in the hypothesis have no statistical significance.
The null hypothesis is:
The regression equation is given as:
The variables are: and
The null hypothesis states that, there is no statistical significance between and
.
This is represented as:
Hence, the null hypothesis is:
Read more about null hypothesis at: