Means and Standard Deviations

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vonirv

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Hello, I am trying to work out the following information:

Concrete cubes tested by crushing in compression at 28 days for two different sites, A&B.

The following crushing strengths (in MN/m2) were obtained:

Site A: 43.4 46.2 41.1 38.5 46.2 45.6 42.7 48.6 44.1 41.6
Site B: 44.6 46.2 42.2 40.4 47.4 46.3 44.7 48.5 45.3 42.8

I need to compare the means and standard deviations, how can I work them out please?
 
Mean is the same as the average. You add up the results and divide by the number of numbers.

Standard Derivation--what is the formula for that?
 
vonirv said:
Hello, I am trying to work out the following information:

Concrete cubes tested by crushing in compression at 28 days for two different sites, A&B.

The following crushing strengths (in MN/m2) were obtained:

Site A: 43.4 46.2 41.1 38.5 46.2 45.6 42.7 48.6 44.1 41.6
Site B: 44.6 46.2 42.2 40.4 47.4 46.3 44.7 48.5 45.3 42.8

I need to compare the means and standard deviations, how can I work them out please?
Click to expand...
Are you allowed to use spreadsheets like MS-Excel?

Those have ready-made functions for those calculations.

Some hand-held calculators can do those operations.
 
Jomo said:
Mean is the same as the average. You add up the results and divide by the number of numbers.

Standard Derivation--what is the formula for that?
Click to expand...
1590651866907.png hi, thanks for the reply, this is what we have been advised to use.....
 
Subhotosh Khan said:
Are you allowed to use spreadsheets like MS-Excel?

Those have ready-made functions for those calculations.

Some hand-held calculators can do those operations.
Click to expand...
Hi, thank you for your reply, we have been told to use whatever we need to understand the equations, and I am trying anything to help me understand which is the only goal of learning, I trust this explaination helps.
 
vonirv said:
Hi, thank you for your reply, we have been told to use whatever we need to understand the equations, and I am trying anything to help me understand which is the only goal of learning, I trust this explanation helps.
Click to expand...
So you are expected to use the equations response #4.

Exactly where are you stuck? Do you understand those symbols used in those equations? For example, what does Σ mean?
 
I've worked it all out now, thank you very much to you all for your time and support, stay safe!
 
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