# Rob Dowler

## Activity

• Look at the Casio fx-300ES Plus. It’s permitted for use on the PSAT/NMSQT, SAT and ACT college entrance exams, AP tests, and NCEES exams. I called ASQ and this is the one they recommend. It’s got all the nifty functions like X squared and factorials like scientific calculators without the memory functions that would kill it for use on the exam.

• Rob Dowler replied to the topic Fewest Samples? in the forum Training 2 years, 1 month ago

I’m thinking at least one point must be true right? Point three encompases they are using the wrong formula altogether. What do you think?

• Rob Dowler replied to the topic Fewest Samples? in the forum Training 2 years, 1 month ago

They actually say in the answer feedback that the formula I used is the correct one. So:

1: I miss-applied a term to the formula.
2: I mis-calculated the formula using the right terms.
3: They made a mistake in the sample exam.

The sample question is from a very well respected organization but everybody makes mistakes.

• Hi,

I am having trouble question found on a sample exam.

Need to know fewest samples for 99% confidence when sheep are fed a a new diet, the avg weight gain is 5 lbs over current avg of 20 lbs. weight gain per sheep is normally dist. with a SD of 4.3 lbs. I know the formula is n=(Zsq x st dev sq)/(E)sq

Therefore I came up with Z=2.58…[Read more]

• Hi,

I am having trouble question found on a sample exam.

Need to know fewest samples for 99% confidence when sheep are fed a a new diet, the avg weight gain is 5 lbs over current avg of 20 lbs. weight gain per sheep is normally dist. with a SD of 4.3 lbs. I know the formula is n=(Zsq x st dev sq)/(E)sq

Therefore I came up with Z=2.58 SD=4.3 E=5…[Read more]

• Hi,

I am having trouble question found on a sample exam too.

Need to know fewest samples for 99% confidence that when sheep are fed a a new diet, the avg weight gain is 5 lbs over current avg of 20 lbs. weight gain per sheep is normally dist. with a SD of 4.3 lbs. I know the formula is n=(Zsq x st dev sq)/(E)sq

Therefore I came up with…[Read more]

• Rob Dowler became a registered member 2 years, 2 months ago