Yet there is considerable opposition to the use of genetically modified plants for food production and other uses. Genetic engineering offers a time-saving method for producing larger, higher-quality crops with less effort and expense. You are a tomato farmer whose crops are threatened by a persistent species of beetle. 2  Each year, you spend large sums of money for pesticides to protect your crops.
To calculate the variance follow these steps: 1  Work out the Mean (the simple average of the numbers). 2  Then for each number: subtract the Mean and square the result (the squared difference). 3  Then work out the average of those squared differences.
1 You can also use the Excel formula wizard to choose the standard deviation formula. 2  Click on Insert in the Formula bar. 3  Then, select Statistical and select STDEV.. 4  Type in your data range in the box that pops up.ress Enter.  Your standard deviation for your sample should appear in the box. 1  You can also use the Excel formula wizard to choose the standard deviation formula. 2  Click on Insert in the Formula bar.