index |
---|
1.56 |
1.49 |
1.47 |
1.41 |
1.34 |
1.29 |
1.25 |
1.22 |
1.23 |
1.12 |
1.10 |
1.08 |
During an index of refraction of water laboratory one laboratory group gathered the data in the table.
Confidence interval statistics | |||
---|---|---|---|
Statistic or Parameter | Symbol | Equations | OpenOffice |
Degrees of freedom | df | n-1 | =COUNT(data)-1 |
Find a tcritical value from a confidence level c | tc | =TINV(1-c;df) | |
Standard error of the sample mean | SE | =STDEV(data)/SQRT(sample size n) | |
Calculate a margin of error for the mean E for n < 30 using sx. Should also be used for n ≥ 30. | E | =tc*sx/SQRT(n) | |
Calculate a confidence interval for a population mean μ from a sample mean x and an error tolerance E | x - E ≤ μ ≤ x + E |