the meaning of the 2 variables. bit confused?
The wages of an employee depend on the time worked. Time is the independent variable that varies among employees, and the wages are calculated directly from the total time worked. Thus wages are dependent on time worked
does that mean that time is also dependant?
A researcher is interested in examining the effectiveness of magnetic therapy for treating
chronic pain. A sample of n = 7 patients is obtained, each of whom has been treated for
severe elbow pain for at least one year. Each patient is given a questionnaire to assess his or
her current level of pain. The patients are then instructed to wear a magnetic band around
their elbows for two weeks. After the two week period, the patients again complete a
questionnaire evaluating their pain.
Whats the dependant and independant variables? no not homework, im studying and im confused. noone else to ask...
whats the null hypothesis, i know it means that its no difference between the means and what are alternate hypothesis??
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Tagged with: alternate hypothesis • chronic pain • dependant and independant variables • elbows • homework • independent variable • magnetic therapy • null hypothesis • questionnaire • researcher • severe elbow pain • wages
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The way I think about independent and dependent variables is as follows.
The independent variable is the information you have. So in the first case, to calculate the wage of the employee you have the length of time that they’ve worked there.
The dependent variable is the one you want to find out. So the wage is what you want to find out. The wage DEPENDS on how long they’ve been working there.
In the second case, the researcher is evaluating the effectiveness of magnetic therapy.
So what information does he have? He has the questionnaires indicating the level of pain. So the level of pain is the independent variable.
What information does he want to find out? He wants to find out if the magnetic therapy reduces the pain. So the difference in the level of pain is the dependent variable.
The null hypothesis confuses me! I’ve attached a Wikipedia link in case it helps, but I can’t make head nor tail of it, I’m afraid…