Standard deviation query

johnuk

New member
Joined
Jan 8, 2019
Messages
2
I am completely lost with standard dev and have to do it as part of a lean course for work. The question I have been set is probably very simple, but I want to know the workings to get to the answer:

a population has a mean of 51 and a standard deviation of 3.4. If repeated samples of 20 units are taken from this population, what is the likely standard dev of the sample means

0.76
3.4
0.17
2.55
 

tkhunny

Moderator
Staff member
Joined
Apr 12, 2005
Messages
10,561
I am completely lost with standard dev and have to do it as part of a lean course for work. The question I have been set is probably very simple, but I want to know the workings to get to the answer:

a population has a mean of 51 and a standard deviation of 3.4. If repeated samples of 20 units are taken from this population, what is the likely standard dev of the sample means

0.76
3.4
0.17
2.55
Sample size 20... Is there a square root in your denominator future?
 

Dr.Peterson

Elite Member
Joined
Nov 12, 2017
Messages
6,663
I am completely lost with standard dev and have to do it as part of a lean course for work. The question I have been set is probably very simple, but I want to know the workings to get to the answer:

a population has a mean of 51 and a standard deviation of 3.4. If repeated samples of 20 units are taken from this population, what is the likely standard dev of the sample means

0.76
3.4
0.17
2.55
Presumably you will have been given a formula for the standard deviation of the sample means. It involves a square root.

Please find it in your notes, try applying it, and write back, so we can give any additional help you need.
 
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