# School

In: Science

Submitted By sammyk
Words 529
Pages 3
1. In basic statistics, the three measures of central tendency are mean, median and mode.
2. In basic statistics, the three measures of dispersion are range, variance, and standard deviation.
3. Degrees of freedom are first determined by determining which type of calculation you will be doing that involves degrees of freedom. Likewise, degrees of freedom are calculated differently depending on the type of test you are performing, which is then determined by the number of samples that you have collected. Secondly, take n-1 for only one sample, where n is the number of observations, which is used for estimating variability. This refers to the range of which the scores in a distribution differ from their mean, or average. Thirdly, Use the formula n1 + n2 for two samples, where there are two means to be estimated. Again, n stands for the number of observations in each sample group, which then leaves you with the formula n1 + n2 - 2 degrees of freedom for estimating variability. And finally, use the formula n-p-1 when there are the number n observations and p+1 parameters that are needed to be estimated.
4. The difference in formulas when calculating a population variance and a sample variance is that both variance use different symbols that mean different things. For instance, population variance uses the symbol µ for population mean and N for the population size and when using sample variance for calculations you use x line for the sample mean and n for the number of value.
5. The difference between a histogram, a frequency polygon, and a box plot is how the data is displayed in these different types of graph. In a histogram, the height of the bar indicates the frequency. However, the bars must touch to indicate that there are no data in the data set that that are missing from the histogram. In a frequency polygon, also known as a line graph, each point...

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