Line of best fit? (1 Viewer)

[enigma_1]

Hi can you show me what the line of best fit wou;ld look like for this?

Do I need to rule it or just rough draw it?

Also, ,do I need to join the dots? Cheers

 

[Queenroot]

It depends... What are the variables?

 

[enigma_1]

independent variable: mol/L (concentration of electrolyte)
dependent variable: change in mass

for electrolytic cells.

 

[Kurosaki]

Well, it follows a linear trend more or less. and for graphs always use a ruler unless its a curve in which case, free hand it

 

[enigma_1]

So do I rule the line of best fit and rule by joining the dots? 2 lines? Like this?

 

[anomalousdecay]

So do I rule the line of best fit and rule by joining the dots? 2 lines? Like this?View attachment 29249

The blue one is close but not quite right.

The HSC marking guidelines usually state this:

• Correctly plots points
• Draws line of best fit with similar number of points above and below the line

That is for two marks.

 

[D94]

The blue line seems alright. You want around the same numbers of points above and below the data.

Don't join the dots like you have.

 

[enigma_1]

The blue one is close but not quite right.

The HSC marking guidelines usually state this:

• Correctly plots points
• Draws line of best fit with similar number of points above and below the line

That is for two marks.

Hmm but in total I have 7 points so 3 above and 4 below is that incorrect?

Ok, I wont join the dots.

 

[someth1ng]

You do a straight line that represents the data.

DO NOT FORCE IT THROUGH ZERO!

 

[nerdasdasd]

Yah the regression should be fine :

 

[anomalousdecay]

Hmm but in total I have 7 points so 3 above and 4 below is that incorrect?

Ok, I wont join the dots.

Have one point on the line so that you have 3 above, 3 below.

You do a straight line that represents the data.

DO NOT FORCE IT THROUGH ZERO!

This as well.