S1 Two-tailed Hypotheses testing

??? Please can someone help me, i really don't understand this concept...

OCR MEI S1, the exam's tomorrow and i'm stressing out, my s1 teacher is so crud!

Halve the significance level and do a one-tailed test.

Eg, two-tailed 10% test of H0: mean = 0 against H1: mean $\ne$ 0.

If the observed mean is more than 0, do a one-tailed 5% test of H0: mean = 0 against H1: mean > 0.

If the observed mean is less than 0, do a one-tailed 5% test of H0: mean = 0 against H1: mean < 0.

what does MEI stand for?

I'm doing OCR S1 tomorrow morning, and hypothesis testing is definitely not in our syllabus. Are you sure it's in it?

What board are you doing?

It's not on Edexcel S1, that's for sure...

Sorry, could you apply what you just wrote to this question:

In a fruit machine there are 5 drums which rotate independently to show one out of six types of fruit (lemon, apple, orange, melon, banana and pear). You win a prize if all 5 stop showing the same fruit. A customer claims that the machine is fixed; the lemon in the first place is not showing the right number of times. The manager runs the machine 20 times and the lemon shows 6 times in the first place. Is the customer's complaint justified at the 10% significance level?

MEI is the "harder" version of the OCR board... yeah i'm 100% sure it's in the MEI one, probably not in your one though...