Friday

January 30, 2015

January 30, 2015

Posted by **kim** on Tuesday, March 5, 2013 at 9:47pm.

- statistics -
**MathGuru**, Wednesday, March 6, 2013 at 6:02pmTry a one-sample t-test since the sample size is fairly small. This will be a one-tailed test (the alternate hypothesis will show a specific direction). Formula for a one-sample t-test is the following:

z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size)

With your data:

z = (620 - 614)/(36/√16) = ?

I'll let you finish the calculation.

There are t-tables that show values for one-tailed and two-tailed tests. If n = 16, degrees of freedom would be n - 1, which is 15. Check the critical value from the table using degrees of freedom for a one-tailed test at .05 level of significance. Compare that value you find from the table to your t-test statistic calculated above. If the t-test statistic exceeds the critical value from the t-table, reject the null. If the t-test statistic does not exceed the critical value from the t-table, do not reject the null. Draw your conclusions from there.

I hope this helps.

**Answer this Question**

**Related Questions**

stats - tire co. has produced 614 tires a day. (standard dev. of 36). they ...

Statistics - Working of a problem--I have found the mean, variance and the ...

Statistics - Working of a problem--I have found the mean, variance and the ...

statistics - A production process is considered to be out of control if the ...

statistics - The typical American generates about 3.8 pounds of solid trash per ...

Statistics - The typical American generates about 3.8 pounds of solid trash per ...

statistic - The mean salary per day of all the 5000 employees who work in a ...

Math - A company has factories located in New Jersey, Ohio, and Georgia where it...

Pre algebra - A bag of balloons contain 2 red balloons, 1 green balloon, 17 ...

Algebra please help out - Tomas makes balloons sculptures at a circus. In 180 ...