CORE MATHS PAPER 2 Questions And Answers

CORE MATHS PAPER 2 h h h


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CORE MATHS PAPER 2 Questions And Answers
1. what happens if there is no correlation between two variables?: as one v
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ariable increases or decreases the ther variable is not affected
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2. does your line of best fit on a scatter graph have to go through 0?: no
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3. how can we reduce variability between different scatter graphs?: add a mean p
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oint
4. what is the mean point?: (means values of x, mean values of y)
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5. does your line of best fit have to go through your mean point?: yes
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6. what is extrapolation?: Predicting data beyond the measured points
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7. What is interpolation?: Inferring data between measured points
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8. what is a regression line?: a more scientific way of drawing a line of best fit
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9. what is the equation of a regression line?: y = a + bx (based off y=mx+c)
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10. what does a and b stand for in the equation of a regression line?: y= a + bx a=
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y intercept —> the value of y when x is 0
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b= gradient h


11. how do you work out regression lines on your calculator?: MENU SETUP 6
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2
put numbers into x and y column AC
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OPTN
3
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12. what is the r value when working out the equation of the regression li
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ne?: correlation coefficient
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13. What is a correlation coefficient?: how strong the correlation between two v
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ariables is h


14. if r is 1 what does this mean?: it is a perfect positive correlation
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15. if r is 0 what does this mean: there is no linear correlation
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16. if r is -1 what does this mean: there is a perfect negative correlation
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17. if 0.5<r<1 what does this mean: there is a strong positive correlation
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18. if 0<r<0.5 what does this mean: there is a weak positive correlation
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19. how do you work out standard deviation from variance: square root variance to
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get standard deviation
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20. how do you work out value on x axis of ND curve when you have the num-
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ber in sample, the mean and standard deviation: z= (number-
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