EXCEL操作参考了How to Create a Normal Probability Plot in Excel (Step-by-Step) (statology.org),图片为个人截图 所用EXCEL版本为2016
Excel instructions Normal probability plots in Minitab What is a Normal Probability Plot? When you have a set of data that you think might have a normal distribution (i.e., a bell curve), a graph of your data can help you decide whether or not your data is normal. Making a histogram...
STEP 3: Plot Normal Distribution in Excel Select theMarksrangeC5:C12. ChooseHome ➤ Editing ➤ Sort & Filter ➤ Sort Smallest to Largest. A warning dialog box will pop out. Check the circle for the second option. PressSort. It’ll return the sorted marks column. ...
Step 2:Visit thenormal probability area indexand find a picture that looks like your graph. Follow the instructions on that page to find the z-value for the graph. The z-valueisthe probability.Tip:Step 1 is technically optional, but it’salwaysa good idea to sketch a graph when you’re...
Equation 5 provides the cumulative probability of y under the distribution curve, i.e., to the left of y. Equation 6 is the inverse operation. For more details, see Excel help. On probability density plots, important probabilities are highlighted with a vertical line at the specified variable...
2: How do I create a bell curve graph in Excel? To generate a bell curve graph in Excel, first enter your data, determine the average and standard deviation, and then utilize a scatter plot to display the curve. 3: What are Z-scores, and how are they used in Excel? Z-scores are...
Read More: How to Create a Probability Distribution Graph in Excel Things to Remember Sort data before plotting the normal distribution. The mean and standard deviation must be numeric. Otherwise, the #VALUE error is displayed. The standard deviation must be greater than zero. Otherwise, the #NU...
You get ready to e-mail your report to your customer, but you happen to note the p-value on the normal probability plot. It is less than 0.05. Oh no! Your data are not normally distributed! It has to be normally distributed to determine Cpk! Your customer is not going to like this...
4. Using Computer Software (Excel) Software such as Excel makes the computation of normal probabilities even easier. The function NORMSDIST(z) returns the cumulative probability P(Z ≤ z) for a given z-score. The function NORMSINV(probability) does the opposite: it returns the z-score correspo...
If the sample data were taken from a normally distributed random variable, then the plot would be approximately linear.Examine the following probability plot. The center line is the relationship we would expect to see if the data were drawn from a perfectly normal distr...