Question 1193364: Calcium is essential to tree growth. In 1990, the concentration of calcium in precipitation in a certain area was 0.15 milligrams per liter. A random sample of 10 precipitation dates in 2018 results in the following data table.
(a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990.
(b) With 95% confidence, the mean concentration of calcium in precipitation in this area in 2018 is between blank mg/ml and blank mg/ml
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! Need the data table.
No, you don't have to pay.
In order to answer the question, we need the variance.
the 95% half-interval is t(0.975, df=9)*s/sqrt(10)
I know the past mean, but I do not know the mean of the 10 values. I know t, but I do not know s, the std dev. of the sample. The mean and sd of the sample of 10 are both needed.
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