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Biology Exam 1
Chapter 1 data analysis
| Question | Answer |
|---|---|
| outlier | value that lies outside of the main value |
| linear correlation | shows the proportionality of two variables |
| histogram | bar chart showing how frequently data in each class occurs in the data set |
| distribution curve | bell graph -mean,median, and mode are equal |
| overestimate or underestimate the true value | sampling error |
| (r) | correlation coefficient- reflects the strength and direction of a linear relationship |
| (r2) | coefficient of the data- shows the % of the data that is closest to the line best fit -determines certainty of predictions |
| positive correlation | r is close to +1 |
| negative correlation | r is close to -1 |
| no correlation | r is close to zero |
| independent variable | values chosen by the experiment (x) |
| dependent variable | values measured in response to changes in the independent variable (y) |
| linear regression | linear relationship between a predictor variable and a response variable |
| confidence interval | range of values resulting from point estimate- the wider the estimate, the greater the confidence |
| point estimate | best guess of an unknown population value |
| standard deviation | shows what is happening between the minimum and maximum scores- and how much the scores vary around the mean |
| mean | average |
| median | value that lies in the middle |
| mode | most frequently occurring |
| range | rough indication of spread of scores does not tell of distribution or variation from the mean |
| max score - min score = | Range |
| measures of central tendency | mean,median,mode |
| variation/spread of distribution | range, standard deviation (indicates the range of scores) |
| Why are statistics used in analyzing data? | statistics summarize data provide a better understanding of overall tendencies within the distribution aid in extracting information from data aid in communication |
| experimental value | the value you obtain from your experiment |
| theoretical value | the expected result from your experiment |
| deviation | tells us whether we are above or below our target value |
| intrinsic error | error that occurs within the system being measured |
| systematic error | error that occurs from measurement process |
| error | the deviation from the expected result |
| accuracy | how close to the expected value |
| precision | how reproducible a result is |
| quantitative data | data that consists of numbers, measurements |
| qualitative data | data that is observed, written descriptions |
| data | observations/measurements fact, statistics, or items of information |
Created by:
kmjoynt
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