PSY 202 Homework 2 KEY.pdf - This material may not be distributed without the explicit consent from its author Dr Nick Prins Homework 2 PSY 202 Prins

# PSY 202 Homework 2 KEY.pdf - This material may not be...

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Homework 2. PSY 202 Prins. 87/87 = 100% Name: __________________________________ Write your final answers on the lines. Show your work. 1. True or False? (Circle correct answer) 2 points each (for total of 10 points) If there are outliers in a distribution it is better to use the mean rather than the mode or the median as a measure of central tendency FALSE. Mean is affected most by outliers It is possible to change one score in a distribution to a different number without affecting the value of the mean FALSE. This fact has never been explicitly mentioned in class. Rather than memorize this fact now, train yourself to answer questions like this (you’ll fare much better on exams). Possible ways in which the answer to this question can be found: -M = X/N, changing a score in a distribution will change X. It will not change N. Thus it will change M. -The mean is the balancing point when you arrange blocks on a seesaw type of construction (Refer to notes or Fig. 2-6 in book). There is no way you can balance such a construction, then move a block around and have the thing still balance. -Try it out. Make up some numbers, calculate the mean, Then try to find a way to change one of the numbers without changing the value of the mean. Sooner or later you’ll convince yourself that it can’t be done. It is better to score a 105 on a test with a mean score of 120 and SD of 10 than it is to score a 70 on a test with a mean score of 85 and an SD of 15 FALSE. Z = (105 – 120)/10 = -1.50 versus Z = (70 – 85)/15 = -1.00 Two outcomes are said to be ‘mutually exclusive’ if one or the other may happen, but they cannot both happen TRUE (NOT GRADED) Two outcomes are said to be independent if obtaining one will affect the probability of obtaining the other. FALSE. Inserting the word ‘not’ between ‘ .... one will’ and ‘affect ...’ will make this statement true. (NOT GRADED) This material may not be distributed without the explicit consent from its author, Dr. Nick Prins

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