OCR psychology paper 1 section C Exam Reported Questions Well Answered

Mean - correct answer Calculated by adding up all the scores in a group/ raw database set and dividing it by the number of participants. Can only be used with interval data Strengths of mean - correct answer - sensitive measure of the average of a set of scores - this means it takes into consideration all the scores -this is a strong cause it is highly representative measure of central tendency and is therefore an accurate representation of the whole data set Weaknesses of mean - correct answer - it can be influenced by rogue scores - this is weakness because it canvas significantly increase/ reduce the calculated mean score making it unrepresentative of the raw data set Median - correct answer This is the middle score. It is calculate by putting the scores in numerical order and finding the middle value at least ordinal level data Median strengths - correct answer -it is unaffected by extreme rogue scores - this is a strength because it means it is more representative of the whole data so is more accurate weaknesses of median - correct answer - it doesn't take all the scores into consideration - this is a weakness because only considering the middle score means that some of the data set is ignored making it less accurate. Mode - correct answer This isn't the most common score/ the one that appears then most in a service of data. requires nominal data Strengths of mode - correct answer -it is unaffectedly by extreme rogue scores -representative of the whole data set Weaknesses of the mode - correct answer -it doesn't take or all the scores into consideration Level of measurement: Nominal - correct answer - Frequencies or categories - E.G. number of left handers - right handers or blue team - red team - mode Level of measurement: Ordinal - correct answer - Data that occurs in ranks or that can be placed in order from highest to lowest - E.G. number of a, b and c grades achieved OR number of correctly recalled items from a list. - the intervals are not fixed - median (sometimes mode) Level of measurement: Interval - correct answer - Units of equal size, but with no absolute zero point. - E.G. temperature (each degree is the same distance apart but there is not true zero point) - Intervals are fixed - mean, median and standard deviation. Quantitative data - correct answer - data in numerical for, - data analysis takes form of making numerical comparisons or through statistical analyses and inferences or visually through graphs, charts and tables. Qualitative data - correct answer - data is non-numerical and descriptive - data analysis takes form of looking for themes or patterns in descriptions Primary data - correct answer - collected first hand - either by witnessing an event or by carrying out and experiment or questionnaire Secondary data - correct answer - collected second hand - through analysis of pre-existing data Range - correct answer - difference between the lowest and highest values. - subtract lower score from higher score Variance - correct answer Tells us about the spread of scores around the mean. So a small variance would imply that al the scores are similar and close to the mean. Calculating the sample variance - correct answer 1: calculate mean 2: find the variance by subtracting the mean from each number in your sample 3: square the result of these calculations 4: add the squared numbers together to find the sum of squares 5: divide the sum of squares by (n-1) n= how many numbers you have in the sample Standard deviation - correct answer The square root of the variance, so it tells us the average amount a number differs from the mean. Calculate Standard Deviation - correct answer the square root of the variance Significance statements - correct answer The results were subjected to a... (name inferential statistic test). The observed value was higher/ lower than the cirtical value of... For a 1/2 tailed test where p 0.05. Therefore the null hypothesis can be rejected. Non - parametric tests - correct answer ordinal/ interval independent - Mann Whitney U repeated - Wilcoxon signed rank test nominal independent - chi-square repeated - binomial signed rank correlations + ordinal/ interval data for relationships