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BUS205 CH 3
| Question | Answer |
|---|---|
| Parameter | characteristic of a population |
| statisitic | characteristic of a sample |
| mean | average |
| median | midpoint of values once ordered from min to max at least ordinal scale required |
| mode | value that occurs most frequently found for nominal level data 1+ mode or no mode |
| dispersion | variation/spread in a set pof data |
| measures of disperision | range, variance, st dev |
| range | max val - min val |
| variance | measures how much the values vary from mean |
| st dev | sq rt of the variance |
| empirical/normal rule | 1 st dev of the mean = about 68% of values 2 st dev of the mean = about 95% of values 3 st dev of the mean = about 99% of values |
| about 68% | mean(500) +/- st dv (1=20) 1*20)= 480-520 |
| dot plot | summarizes the distribution of q variable by stacking dots as points on no. line |
| box plot | a graphic display that shows the general shape of a variables distribution based on min, q1, median, q3, max |
| interquartile range | q3-q1 |
| greater than upper boundry | q3+1.5(q3-q1) |
| lower than upper boundry | q3-1.5(q3-q1) |
| symmetric skew | in middle |
| positively skewed | peak in left |
| negatively skewed | peak in right |
| bimodal skew | half peak in right and left |
| contingency table | table used to classify observations according to 2 caricteristics |
| probability | value 0-1 inclusive that reps something happening |
| outcome | specific result of experiment |
| even | a collection of 1+ outcomes |
| probability % | no. of favorable outcomes/no. of all outcomes |
| permuation | any arrangement of r objects selected from a single group o n possible objects |
| combination | an event of outcomes when the order of the outcomes does not matter |
| empirical probabliltuy | the probability of an event based on a collection of observations or data no. o times event occurs/ total no. of observations |
| mutually exclusive | occurange of one event means no other events can occur at the same time |
| collectively exhaustive | at least one of the event must occur |
| joint probability | probability that measures the likelihood 2+ event s will happen concurrently |
| independence | the occurance of one event has no effecr on another |
Created by:
JMoreno161
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