WACE Stuff > Mathematics Stage 3
Maths 3A/3B
Shadowxo:
--- Quote from: anotherworld2b on September 11, 2017, 12:16:23 pm ---I am having trouble with commenting on the results for part c. I'm not quite sure what to compare and focus on
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You wouldn't normally have to answer a question as ambiguous as this, but things you could mention are
- p^ is quite different to p. Reasons for this discrepancy could include
-Small sample size (only 240)
-Not a random sample - it's from "a particular region in the country" so doesn't represent the population as a whole
anotherworld2b:
Hi I was wondering if I could get help with question 14
anotherworld2b:
And help with part d for this question too please
jamonwindeyer:
--- Quote from: anotherworld2b on September 14, 2017, 08:59:14 pm ---Hi I was wondering if I could get help with question 14
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The first bit is literally just substituting the maximum and minimum values from the expression of \(0.241\pm0.06\).
As for the second bit, it's been a year since I've done confidence intervals, but pretty sure this is the job for a large scale confidence interval?
It might also be the t-distribution since variance is unknown - Sorry, I'm pretty rusty on this. Whatever style interval you have been using will likely work again, you'll be taking the 0.06 from the expression and putting it equal to the expression being added/subtracted to get the endpoints of your interval. You'll be able to draw values out of there I'm fairly certain :)
Second one should be similar, your answer for (c) would have endpoints that are more than 3% from the mean. You want them to be 3%, that is, the endpoints need to be \(\bar{x}\pm0.03\bar{x}\). Find the value for \(n\) that achieves this with everything else the same :)
anotherworld2b:
Can I have help with part a and b?
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