| IB Studies - Statistics |
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| Data |
- Finding the mean, mode and median from tables.
- Finding the mean from a grouped frequency table, including using the GDC.
- Understanding of a population and a sample drawn from the population.
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| Cumulative frequency curves |
- Plotting cumulative frequency curves.
- Find median, quartiles and the inter-quartile range.
- Find percentiles from a cumulative frequency curve.
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| Box and whisker plots |
- Draw and interpret box and whisker plots.
- Appreciate the inter-quartile range as a measure of spread.
- Be able to compare box and whisker plots.
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| Mean and standard deviation |
- Appreciate the concept of standard deviation and variance as a measure of spread.
- Appreciate how the standard deviation is derived.
- Be able to calculate both the standard deviation and the mean of a grouped frequency table by use of a GDC.
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| Correlation and regression |
- Drawing scatter diagrams and drawing a line of best fit by eye.
- Understanding negative, positive, strong, weak, and no correlation.
- Finding Pearson's product-moment correlation coefficient, and interpreting the result to comment on correlation.
- Finding the y on x regression line.
- Using the y on x regression line to predict answers.
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| Chi-squared test of independence |
- Forming a null and alternate hypothesis.
- Using significance levels and reading tables and a GDC.
- Set up contingency tables, including on the GDC.
- Finding expected frequencies.
- Finding degrees of freedom. Yates continuity correction will not be required.
- Using the chi squared formula and interpreting the results when comparing to the critical values from tables or the GDC.
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