Maths, Addmaths and Statistics: Post your doubts here!

[vianrony]

i need help in cosine rule

 

[PlanetMaster]

i need help in cosine rule

Are you struggling to understand the rule or having issues applying it to questions?

 

[badrobot14]

Are you struggling to understand the rule or having issues applying it to questions?

Having issues finding your reply between all the ads xD

 

[ANaghAV]

I have a doubt. How do you know when to use what in the Further Stat questions??? Esp. hypothesis-testing!

 

[PlanetMaster]

Having issues finding your reply between all the ads xD

That was not in the options!

 

[PlanetMaster]

I have a doubt. How do you know when to use what in the Further Stat questions??? Esp. hypothesis-testing!

Can you please provide an example question?

 

[ANaghAV]

Can you please provide an example question?

For example :

A college careers officer investigates the income at age 24 of a group of students who left school at 16, and a group who stayed on to take their A-Levels.
The results he finds are summarized in the table.

	16-year-old leavers	A-Level leavers
Mean	156	164
Sample estimate of variance	673	593
Sample size	37	28

Show, using a 2-sample t-test, that the hypothesis that those staying on at school have higher incomes at age 24 is rejected, on the evidence of this sample.

 

[ANaghAV]

For example :

A college careers officer investigates the income at age 24 of a group of students who left school at 16, and a group who stayed on to take their A-Levels.
The results he finds are summarized in the table.

	16-year-old leavers	A-Level leavers
Mean	156	164
Sample estimate of variance	673	593
Sample size	37	28

Show, using a 2-sample t-test, that the hypothesis that those staying on at school have higher incomes at age 24 is rejected, on the evidence of this sample.

can someone please help with this...?

 

[PlanetMaster]

For example :

A college careers officer investigates the income at age 24 of a group of students who left school at 16, and a group who stayed on to take their A-Levels.
The results he finds are summarized in the table.

	16-year-old leavers	A-Level leavers
Mean	156	164
Sample estimate of variance	673	593
Sample size	37	28

Show, using a 2-sample t-test, that the hypothesis that those staying on at school have higher incomes at age 24 is rejected, on the evidence of this sample.

To test the hypothesis, we generally need to find the z-score also known as Test Statistic and then use it to find the p-value.
If \(p>0.05\), this means that the mean values have no difference and the hypothesis is rejected.

Substituting your values in this online calculator, we get \(z=-1.275\) and \(p=0.1036\) and since \(p\) is greater than \(0.05\), we can say the hypothesis is rejected.

P.S. I am not 100% sure about this so please take this with a grain of salt.

 

[ANaghAV]

To test the hypothesis, we generally need to find the z-score also known as Test Statistic and then use it to find the p-value.
If \(p>0.05\), this means that the mean values have no difference and the hypothesis is rejected.

Substituting your values in this online calculator, we get \(z=-1.275\) and \(p=0.1036\) and since \(p\) is greater than \(0.05\), we can say the hypothesis is rejected.

P.S. I am not 100% sure about this so please take this with a grain of salt.

Thank you soo much! That's exactly what the marking scheme says so you are perfectly correct! Cheers!

 

[JesterDragon]

How to revise maths for exams as someone who really hates maths and wants an A?

Practicing gets really boring for me. Most of the topics in my syllabus are ones I've done before, but need to (ugh)... practice.

It's too time consuming, and with other exams in the way, I have no idea how I'm going to cover the material. Any advice, guys?