Answer:
The 80% confidence interval for the the population mean nitrate concentration is (0.144, 0.186).
Critical value t=1.318
Step-by-step explanation:
We have to calculate a 80% confidence interval for the mean.
The population standard deviation is not known, so we have to estimate it from the sample standard deviation and use a t-students distribution to calculate the critical value.
The sample mean is M=0.165.
The sample size is N=25.
When σ is not known, s divided by the square root of N is used as an estimate of σM:
The degrees of freedom for this sample size are:
The t-value for a 80% confidence interval and 24 degrees of freedom is t=1.318.
The margin of error (MOE) can be calculated as:
Then, the lower and upper bounds of the confidence interval are:
The 80% confidence interval for the population mean nitrate concentration is (0.144, 0.186).
Answer:
A = 216
Step-by-step explanation:
<em><u>The shape presented is an isosceles triangle, and the formula for this is:</u></em>
A =
<em><u>The "</u></em><em><u>," is the base (27) and the "</u></em><em><u>," is the height (16), so plug these in:</u></em>
A =
A =
A = 216
40,023,032 = 40,000,000 + 20,000 + 3,000 + 30 + 2
Answer:
4 whole days
Step-by-step explanation:
If he wrote 3 pages each day and he has to write 12 pages then it would take him 4 days.
Step-by-step explanation:
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