A population is estimated to have a standard deviation of 9. We want to estimate the population mean within 2, with a 99% level of confidence. How large a sample is required? (Round up your answer to the next whole number.)

The sample required is  

Step-by-step explanation:

From the question we are told that

     The  standard deviation is  

      The margin of error is

Given that the confidence level is  99%  then the level of  significance is mathematically evaluated as

Next we will obtain the critical value   from the normal distribution table(reference  math dot armstrong dot edu) , the value is  

The  sample size is mathematically represented as

substituting values

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answer: hey there,

the answer you are looking for is a..

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