Mastering Statistics: Exam Preparation for Mathematics, Exams of Mathematics

Download Mastering Statistics: Exam Preparation for Mathematics and more Exams Mathematics in PDF only on Docsity! MATHS PAPER 2 exam practice test and the correct answers 1. What happens if there is no correlation between two variables? - Correct Answer as one variable increases or decreases the their variable is not affected 2. Does your line of best fit on a scatter graph have to go through 0? - Correct Answer no 3. How can we reduce variability between different scatter graphs? - Correct Answer add a mean point 4. What is the mean point? - Correct Answer (means values of x, mean values of y) 5. Does your line of best fit have to go through your mean point? - Correct Answer yes 6. What is extrapolation? - Correct Answer Predicting data beyond the measured points 7. What is interpolation? - Correct Answer Inferring data between measured points 8. What is a regression line? - Correct Answer a more scientific way of drawing a line of best fit 9. What is the equation of a regression line? - Correct Answer y = a + bx (based off y=mx+c) 10.What does a and b stand for in the equation of a regression line? - Correct Answery= a + bx 11.a= y intercept —> the value of y when x is 0 12.b= gradient 13.How do you work out regression lines on your calculator? - Correct Answer MENU SETUP 14.6 15.2 16.Put numbers into x and y column 17.AC 18.OPTN 19.3 20.what is the r value when working out the equation of the regression line? - Correct Answer correlation coefficient 21.What is a correlation coefficient? - Correct Answer how strong the correlation between two variables is 22. If r is 1 what does this mean? - Correct Answer it is a perfect positive correlation 23. If r is 0 what does this mean - Correct Answer there is no linear correlation 24. If r is -1 what does this mean - Correct Answer there is a perfect negative correlation 25. If 0.5<r<1 what does this mean - Correct Answer there is a strong positive correlation 26. If 0<r<0.5 what does this mean - Correct Answer there is a weak positive correlation 27.How do you work out standard deviation from variance - Correct Answer square root variance to get standard deviation 28.how do you work out value on x axis of ND curve when you have the number in sample, the mean and standard deviation - Correct Answer z= (number- mean)/ standard deviation 29.What mean and standard deviation does a standardised normal distribution curve have - Correct Answer mean= 0 30.Standard deviation= 1 31.How do you work out standardized scores - Correct Answer (score-mean)/ standard deviation 32.How do you calculate probabilities from a ND curve on your calculator - Correct Answer MENU SETUP 33.7 34.2 35.Fill in values (if there is no mean or standard deviation given use the standardized ones) 36.Write answer as a percentage