Hello,
Can you help me with a question about slope and intercept? Thank you.
21 Absent 26.0 3834.0 22 Absent 11.0 1690.0 23 Absent 17.0 2382.0 24 Absent 13.0 1789.0 25 Present 5.0 1507.0 26 Absent 26.0 3074.0 27 Present 21.0 2341.0 28 Absent 27.0 4339.0 29 Present 5.0 1430.0 30 Present 22.0 1794.0 31 Present 8.0 1702.0 32 Present 31.0 2485.0 33 Absent 30.0 3403.0 34 Absent 15.0 2447.0 35 Absent 10.0 2696.0 36 Absent 19.0 2728.0 37 Present 17.0 1893.0 38 Absent 25.0 2458.0 39 Present 31.0 1793.0 40 Present 8.0 2010.0r Your trial-by-trial data On each trial, your task was to report whether there was a green circle or not. Each row below indicates the characteristics of each trial. The second column indicates whether the target was present or not. The third column indicates the number of distractor elements, and the last column gives the time between the onset of the display and your key press. Trial Target Number of distractors Reaction time (ms) 1 Present 5.0 1585. 0 2 Absent 21.0 3896.0 3 Present 11.0 1777.0 4 Present 15.0 1555.0 5 Present 27.0 2708. 0 6 Present 19.0 2326.0 7 Absent 18.0 3638.0 8 Absent 27.0 5802. 0 9 Absent 28.0 3263.0 10 Absent 17.0 2717.0 11 Present 8.0 2171.0 12 Absent 19.0 4131.0 13 Present 30. 0 3074.0 14 Present 270 2462.0 15 Absent 11.0 2549. 0 16 Absent 13.0 2163.0 17 Present 23.0 1790.0 18 Absent 18.0 2250.0 19 Present 16.0 1650.0 20 Present 16.0 1152.0 Reaction Time = a + b (Number of distractors) where a is the intercept and b is the slope. To complete the assignment you will not need the data from trials where the target was present.Formulas To calculate the slope (b), you need to rst calculate the standard deviation of the number of distractor values (31), the standard deviation for the reaction time values (52}. and the correlation between the scores (r). These values are then combined to compute the slope: To calculate the intercept, rst compute the mean of the number of distractor values (Y1) and the mean of the reaction time values (i2). The intercept is then computed with this formula: azfz bX1. Answer the questions using the data below. You will often find it helpful to sort the data and calculate values using a spreadsheet such as Microsoft Excel, Sheets from Google apps, Open Office, or Numbers {Mac only). To import the data into a spreadsheet select and copy all the cells in the trial-by-trial data table below and then paste them into an open page of the spreadsheet. Use the trial-bytrial data to answer these questions. Question Answer Satandrd deviation of the reaction times (52): :[ (The difference between your answer and the correct value must be less than 0.01.) b. (The difference between your answer and the correct value must be less than 0.01.):[ :i :E Mean of the reaction times: (The difference between your answer and the correct value must be less than 0.01. )
