ASM 13th Ed - TI-30XS results for question 24.9

[DukeOfWaterloo]

I was using the calulation tips on page 415 for question 24.9

I punched the keys on my TI-30XS calulator twice, but both gave the result of 0.005357142, which is different than the given answer 0.005507174.

Is it a rounding issue or I didn't follow the steps correctly? Can someone confirm? Thanks a lot.

[Abraham Weishaus]

Appears to happen because the value is entered into the table. At the last step, you should clear out of the data table by pressing clear, then get the sum stat and multiply by e^2x.

[DukeOfWaterloo]

I cleared out, but now got 6.99346*10^(-11). Don't know where goes wrong.

I checked the Sigma x, the sum of all Si/(Ri*(Ri-Si) in the last step, and its value is 0.23968.

But if I calculate sum of all Si/(Ri*(Ri-Si) directly, I get 0.03387566, which does not agree with 0.23968.

It's weird. Are these steps not working on TI-30XS Multiview that I am using?

[DukeOfWaterloo]

I have figured out the problem. It was caused by the wrong FREQ entry that I used.

When calc sample mean, we should always set FREQ=One (unless you have repeats and intentionally use FREQ).

I think the manual should add setting FREQ=One besides setting DATA=L3 on Page 415.