lauramercier
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Report Thread starter 7 years ago
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Hi!

How would I work this out?

A population is normal with mean 20 and standard deviation 5.
A random sample of size 10 is taken:



  • What is the standard error (STEM) of Image ?
  • How many standard errors (STEMs) away is 28 from the mean?
  • Using normal distribution tables, what is Pr( Image ≥ 28 )? (We can use normal tables because the sampling distribution of the mean (i.e. how the sample means are distributed) is a normal distribution if the population has a normal distribution)

I'm so confused :confused::confused::confused::confused:
Big love to whoever can help me
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lauramercier
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PLEEEEASE HELP MEEEE - I'll be so grateful
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Andy98
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The standard error of a sample of sample sizeImage is the sample's standard deviation divided by Image. It therefore estimates the standard deviation of the sample mean based on the population mean. The standard error of an estimate may also be defined as the square root of the estimated error variance Image of the quantity,
http://mathworld.wolfram.com/NormalDistribution.html for more info click that link - I've got no clue what it means but it might help (and it looked the least confusing)
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