Math
posted by Tracy .
If the population standard deviation is 8, how
large a sample is necessary to have a standard error
that is:
a. less than 4 points?
b. less than 2 points?
c. less than 1 point?

SEm = standard error of the mean
SEm = SD/√n
Insert values and solve.
Respond to this Question
Similar Questions

Statisitics:Standard Deviation of Population and o
Standard Deviation of Population and of a Sample The weight of newborn children in the United States vary according to the normal distribution with mean 7.7 pounds and standard deviation 1.68 pounds. The government classifies a newborn … 
statistics
what are the mean and standard deviation of a sampling distribution consisting of samples of size 16? 
Statistics
For a population with a standard deviation of 10, how mlarge a sample is necessary to have a standard error that is less than or equal to 5 points? 
math
If the true population standard deviation was known to be 3.0, then approximately what minimum sample size would you need in a simple random sample if you want a 95% confidence interval for the mean to have a margin of error of .5 … 
math
Can I gt some help on these questions! 1.Research subjects that are divided up based on gender, age, etc. to be compared to people of the same group is what type of design experiment? 
math
1. Consider the following scenario: A random sample obtained from a population has a mean of µ=100 and a standard deviation of σ = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points … 
Stastics
If the population standard deviation is Ợ=8, how large a sample is necessary to have a standard error that is a. Less than 4 points? 
Statistics
In an essay of 250500 words, thoroughly address the following items and respond to the related questions: 1.Define the term standard deviation. Why is it important to know the standard deviation for a given sample? 
Stats
A random sample obtained from a population has a mean of µ=100 and a standard deviation of ó = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and … 
Stats
A random sample obtained from a population has a mean of µ=100 and a standard deviation of ó = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and …