Thursday

February 26, 2015

February 26, 2015

Posted by **Dawn** on Saturday, August 21, 2010 at 6:18am.

Assume that these observations are an SRS from the late Cretaceous atmosphere. What is the mean percent of nitrogen in ancient air with a 90% confidence level?

Hint: uses one-sample t confidence

- Statistics -
**MathGuru**, Sunday, August 22, 2010 at 8:24amFormula: CI90 = mean + or - (t-value)(sd/√n)

Determine the t-value from a t-table. Use degrees of freedom 8 (which is sample size minus one). You will also need to determine the mean by adding up the values and dividing them by the sample size. Find sd (standard deviation) as well. Substitute those values into the formula to calculate the confidence interval.

I hope this will help get you started.

**Answer this Question**

**Related Questions**

statistics - okay heres the question and the answer I have, but Im not sure its ...

earth - Atmosphere Homework! 1.Which of the following layers of the atmosphere ...

statistics - The mean of a normal probability distribution is 100 and the ...

Physics - A plastic bag is filled with nitrogen at atmospheric pressure and 22.0...

Physics - A plastic bag is filled with nitrogen at atmospheric pressure and 22.0...

physics - A plastic bag is filled with nitrogen at atmospheric pressure and 22.0...

Physics - A plastic bag is filled with nitrogen at atmospheric pressure and 22.0...

Physics - A plastic bag is filled with nitrogen at atmospheric pressure and 22.0...

Statistics - Biologists studying the healing of skin wounds measured the rate at...

Physics - What is the approximate energy required to raise the temperature of 5 ...