Hello, can you help me with this question about Standard (Z) Scores? Thank you.
. Your Irlalrbyrmal data The entire list must be recalled in order tor the response to be correct. Across all students (ii : 3337) with completed this lab, ttie meari memory span tor a was 6.85 with a standard deviation across students at 1.6. For the word lists. the mean memory span was 4.42 with a standard deviation across students of1.26. Trial Type of stimulus List length Response 1 Digits 3 0 Correct 2 Digits 4.0 Correct 3 Words 3 0 Correct 4 Words 4 0 Incorrect 5 Words 3 0 Correct 6 Digits 5 0 Correct 7 Digits 6.0 Correct 3 Digits 7 0 Correct 9 Words 4 0 Correct 10 Words 5 0 Correct 11 Words 6 0 Incorrect 12 W0rds 5.0 Correct 13 Digits a 0 Correct 14 Words 6 0 Correct 15 Digits 9 0 Correct 16 Digits 10 0 Correct 17 Digits 10.0 Correct 10 Digits 10 0 Correct 19 Words 7 0 Correct 20 Words 3 0 Correct What methods did we employ in this experiment? 0n eaoti trial, you saw a list of items presented one at a time and were asked to recall the items in the same order in which they were presented ltyou gal a list conect, the list length increased by 'l tor that type oi material ll you got a list inoo rrect, the list length decreased by l The independent variable is the type ol material you were asked to recall digits or words Memory span ian be measured in lots oi dilterent ways in this lab, the dependent variable is the length oi the last list you conectly remlled The first list at each type ot item was 3 items long The longest list that was shown was to, so the maximum score possible is 10 The minimum possible score is 2, What do we predict participants will do? Why? Based on past research, we expecI memory span to be longeer numbers than torwords Both memory span measures are estimates oi immediate memory, with longer memory spans indicating better rriemory in the questions below you will compare your memory span measures to those at other students who have oompleted this lab You do this by oomputing zescores (also called standard scores) Even though your memory span tor numbers may be longer than your memory span tor words, when you convert both olthese memory span measures into zescures, they will probably be tairly close to each other That is, your memory span tor numbers, relative to the memory spans ol other students, is probably pretty similar to your memory span tor words, relative to the memory spans or other students Zescures allow us to compare dirterent measures relative to the mean and standard dewation oi their respective distributions Haw mbusl is this eect'? Are there I Is Ito this effect? Memory span is a common way ol measuring some aspects ol human memory vtmh ZasDu res you can compare how your memory spans compare to the distribution oi memory spans tor other students, A positive Zascore indicates that your memory span is larger than the mean span of other students A negative number indicates that your memory span is smaller than the mean span of other students The mean and standard deviation otthe memory spans at other students is given in the text before the trialoytrial data table. Answer the questions using the data below You will otten nd it helplul to sort the data and calculate values using a spreadsheet such as Mluoso Expel, Sheets trdm Google apps, Open Ofce, or Numbers (Mac only) To im port the data into a spreadsheet select and copy all the cells in the lrlalebyemal data table below and then paste them into an open page of the spreadsheet Use the trial-by-trial data to answer these questions. Question Answer Memory span for digits: (Your answer must exactly equal the correct value.) Memory span for words: (Your answer must exactly equal the correct value.) z-score for the memory span for digits: (The difference between your answer and the correct value must be less than 0.01.) z-score for the memory span for words: (The difference between your answer and the correct value must be less than 0.01.)
