A software developer wants to know how many new computer games people buy each year. Assume a previous study found the variance to be 1.44. She thinks the mean is 6 computer games per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.15 at the 99% level of confidence

The sample size is  

Step-by-step explanation:

From the question we are told that

   The population  variance  is  

   The mean is  

     The margin of error is  E =  0.15

Generally the standard deviation 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

=>

=>  

answer: .75 km

step-by-step explanation:

the answer is b.)

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