Join TSR now and get all your revision questions answeredSign up now

Statistical tests Watch

    • PS Helper
    • Thread Starter
    Offline

    1
    ReputationRep:
    Hi

    I'm investigating the effect of CO2 on the rate of photosynthesis for my biology coursework. What i've done is add increasing amounts of sodium hydrogencarbonate in order to vary the amount of O2 gas produced, and I found that there's a positive correlation between the two.

    Howeverrrr, I have absolutely no idea which statistical test I am able to use... I tried using Spearman's rank, but when I ranked O2 + hydrogencarbonate, they were ranked equally, which means that when they're subtracted from one another, I get 0.

    Please help lol.

    Thank you!
    Online

    3
    ReputationRep:
    (Original post by TheStudent.)
    Hi

    I'm investigating the effect of CO2 on the rate of photosynthesis for my biology coursework. What i've done is add increasing amounts of sodium hydrogencarbonate in order to vary the amount of O2 gas produced, and I found that there's a positive correlation between the two.

    Howeverrrr, I have absolutely no idea which statistical test I am able to use... I tried using Spearman's rank, but when I ranked O2 + hydrogencarbonate, they were ranked equally, which means that when they're subtracted from one another, I get 0.

    Please help lol.

    Thank you!
    If you used at least 2 different concentrations of NaHCO3, I'd go for Standard Error and 95% Confidence Limits, as they measure the difference between the mean values of each concentration.

    However, you'd have to do quite a lot of repeats in order to get a precise answer .
    • PS Helper
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by thegodofgod)
    If you used at least 2 different concentrations of NaHCO3, I'd go for Standard Error and 95% Confidence Limits, as they measure the difference between the mean values of each concentration.

    However, you'd have to do quite a lot of repeats in order to get a precise answer .
    So basically i'm screwed
 
 
 
Poll
Is GoT overrated?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.