It is A) skewed left because the long tail in the box plot is on the left hand side. The mean is also on the left hand side of the peak so it is skewed left.
Hope this helps :)
Answer:
There is sufficient evidence to conclude that six inches spacing has a higher mean failure pressure than 8 inches
Reject level of significance
Step-by-step explanation:
From the question we are told that:
Sample size 1
Spacing 1
Mean 1
Standard deviation 1
Sample size 2
Spacing 2
Mean 1
Standard deviation 1
Generally the hypothesis is mathematically given as
Null
Alternative
Generally the equation for pooled estimate is mathematically given by
Therefore
Generally the equation for test statistics is mathematically given by
Therefore From table
Therefore
There is sufficient evidence to conclude that six inches spacing has a higher mean failure pressure than 8 inches
Reject level of significance