Any Statistics Whizzes help with a GCSE question?

[Notmyrealmum]

I have attached a pic of my DS's homework as I have no clue how to even start to try to help him work it out! Any help very welcome.

Relative risk for York is 0.93/0.75

Absolute risk for Littlehampton is 1- 0.75 = 0.25.

That'll teach me to read the question! The risk given is that the calls take less than 8 mins. The question asks for more than 8 mins.

Sorry, Littlehampton is 0.25 (25%). It's 1 - 0.75.

I think part 2 is 7/25 as it says more than the 8 minutes to respond.

Surely not 8 mins so 0.25 or 25%
Then the difference between 93 and 75 so .18 or 18%

Relative risk isn't the difference between the two, it's the size of one compared to the other so you divide the rate experienced by the target.

Yes it needs to be less than 7% logically doesn't it for the answer to make sense as they perform far better than target by 18%.

7/25 is 28% but that doesn't make sense as they exceed the target. Is it -24%?

The relative risk is 7/25 =0.28

I stil can't read the question! 0.07 / 0.25 = 0.28 or 28%. The interpretation is that calls in York are nearly three times less likely to be over 8 minutes than the national target which intuitively makes sense.

It's less than one, meaning it's less likely to take more than 8 minutes than the target.

So which one are we settling on? :)

OK I get it now. 0.28. I now understand relative risk, like probability compared to a control where 1 is null.

Glad we weren't the only ones struggling with it! I'm dreading the rest of the year if this is the first homework. Roll on June