5\. Move the cursor to the word CALCULATE with the arrow keys and press ENTER. The screen will change again to show several statistics parameters, including the mean and standard deviation. Record these two parameters to use in the z-score equation. 6\. Calculate the z-score by subtracting...
The z-score, which is also known as the standard score, is the number of standard deviations from the mean a data point is. In case you are looking for a more technical definition, then we can say that the z score is a measure of how many standard deviations there are that are above...
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Find the arithmetical mean and standard deviation of all the students’ test scores. You can do this using a computer program, a graphing calculator or simply by hand. Tocalculate standard deviation, subtract the mean from each test score to find each score's deviation. Square each deviation,...
To find your z-score, use the table below. So, if you want a 99% confidence level, you’ll need a z-score of 2.58. If you want a 95% confidence level, you’ll need a z-score of 1.96 — and so on. Essentially, your sample size is decided based on the populat...
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Step 2: Subtract your result from Step 1 from 1 and then look that area up in the middle of the z-table to get the z-score: 1– 0.025 = 0.975 z score = 1.96. Step 3: Plug the numbers into the second part of the formula and solve: z* σ / (√n) = 1.96 * 1.2/√(6) ...