The width of a rectangle is 3 inches less than half of the length. The length is 27 inches. What is the area of
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Complete Question
A civil engineer is analyzing the compressive strength of concrete. Compressive strength is normally distributed with. A random sample of 12 sample specimens has a mean compressive strength of
. Round your answers to 1 decimal place. (a) Calculate the 95% two-sided confidence interval on the true mean compressive strength of concrete.
Answer:
Step-by-step explanation:
From the question we are told that:
Sample size
Standard deviation
Sample mean
Confidence level =95%
significance level
From table \alpha 0.05
Gives
Generally the equation for confidence interval is mathematically given by