g Suppose the investigators had made a rough guess of 0.14 for the value of the sample standard deviation, s, before collecting data. What sample size would be necessary to obtain an interval width of 0.04 from a confidence level of 99% for a two-sided confidence interval

The sample size is  

Step-by-step explanation:

From the question we are told that

  The rough estimate of the standard deviation is  

   The interval width is  

Generally the margin of error is mathematically represented as

=>      

=>      

From the question we are told the confidence level is   99% , hence the level of significance is    

=>  

Generally from the normal distribution table the critical value  of   is  

Generally the sample size is mathematically represented as

=>  

=>  

step-by-step explanation:

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