PSYC 1010 Study Guide - Midterm Guide: Raw Score, Standard Deviation, Statistical Hypothesis Testing
9 Oct 2013
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Probability tests and z-scores: avg. employee in canada spends u=22 min commuting to work each day. Assume distribution of commute times is normal with a variance of o2=49 minutes. For each of the following questions, make sure you: sketch the distribution state the formula you used. You don"t need to label mean for full marks but it helps. Upside down parabola with 22 at the bottom of line in middle. Z=x-u/sigma= (z score of . 71) were looking for proportion of the tail so we go to the right column and find out it"s 23. 89% Proportions show all decimals, when looking something up in the table write all values. Shes not worried about the probability of x being less than 17. You would lose a half mark if you leave as probability and don"t turn it into proportion. Now that you have sigma it is now a 3 mark question. Looking for area below 33, left hand body of the distribution.
