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THIRD TIME POSTING THIS QUESTION! DO NOT ANSWER IF YOU ARE UNSKILLED IN THIS AREA!!!! Consider...

THIRD TIME POSTING THIS QUESTION! DO NOT ANSWER IF YOU ARE UNSKILLED IN THIS AREA!!!!

Consider the following sample data with mean and standard deviation of 18.1 and 7.4, respectively. (You may find it useful to reference the appropriate table: chi-square table or F table)

Class Frequency
Less than 10 33
10 up to 20 88
20 up to 30 69
30 or more 13
n = 203

b-1. Calculate the value of the test statistic. (Round the z value to 2 decimal places, all other intermediate values to at least 4 decimal places and final answer to 3 decimal places.)
Test statistic
Math   Statistics-And-Probability   
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Answer #1

Solution:

We have to find the expected frequencies first.

We are given that:

Now, using the normal distribution the expected frequencies are:

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