Answer:
The 95% confidence interval for mean compressive strength is:

Step-by-step explanation:
We have a sample of n=12 specimens, with sample mean=3259.9 and sample standard deviation = 35.57.
We know the population is normally distributed.
For a 95% confidence interval and df=n-1=11, the t-statistic is t=2.201.
Then, the CI can be expressed as:

8.11 mm I think i tried to do that it coud be wrong tho so check it
3.987 rounded to the nearest tenth = 4.0
Answer:
Options ?
Step-by-step explanation:
Answer:
953752765585
Step-by-step explanation:
Hope this helps.