So I am taking this online Algebra 2 course and need some help. Probably a lot more than a single problem too

A teacher wants to compare the mean geology scores of two different classes. She is testing the null hypothesis that there is no difference in the population mean scores of the two classes. The difference of the sample means is 51.4. If the standard deviation of the distribution of the difference of sample means is 16.66, what is the 95% confidence interval for the population mean difference?

Question

So I am taking this online Algebra 2 course and need some help. Probably a lot more than a single problem too

A teacher wants to compare the mean geology scores of two different classes. She is testing the null hypothesis that there is no difference in the population mean scores of the two classes. The difference of the sample means is 51.4. If the standard deviation of the distribution of the difference of sample means is 16.66, what is the 95% confidence interval for the population mean difference?

boldjon · Answer

the z score of the 95% confidence interval is 1.96

boldjon · Answer

so you want

51.4 +/-  1.96 * 16.66

boldjon · Answer

interval : ( 51.4 - 1.96*16.66 ,  51.5 + 1.96 * 16.66 )

anonymous · Answer

Thanks for replying!. give me a sec to compute that

anonymous · Answer

The answer I got isn't an option though. Here are the options
between -33.2 and +33.2

between -49.9 and +49.9

between -102.8 and +102.8

between -154.2 and +154.2
 No se.

anonymous · Answer

Oops I guessed and I missed the test. Thanks for the help though