A researcher who wanted to understand whether there was a significant difference between the average grades of the students from 3 different courses obtained the following data (Same number of samples was taken). a) In the table containing the data for variance analysis, “?” Find the data indicated by the sign and the number of samples. b) Test whether there is a significant difference between the means at the 5% significance level.

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A: Approach to solving the question:  Detailed explanation: Examples: Key references:

Q: Suppose a population has three values 13, 17 and 24. What is its variance?

A: Given: n=3 The mean of the data is obtained as below: Mean=∑xn=13+17+243=543=18 The mean is 18.

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Q: Q. 14 What is the difference between sample mean and population mean?

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Q: What formula is used to calculate the sample variance?

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Q: 2. How is the sample size related to the deviation?

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Q: What is the likely media when the mean is 9 the sample variance is 7.31 and the skew is 1.04

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