The cost of spare parts per machine are normally distributed with a population standard deviation of 158 dollars and an unknown population mean. If a random sample of 23 machines is taken and results in a sample mean of 1790 dollars, find the error bound (EBM) of the confidence interval with a 98% confidence level

The 98% confidence interval is

Step-by-step explanation:

From the question we are told that

   The population standard deviation is  

    The sample size is  n  =  23

    The sample mean is  

From the question we are told the confidence level is  98% , hence the level of significance is    

=>  

Generally from the normal distribution table the critical value  of   is  

Generally the margin of error is mathematically represented as  

Generally 98% confidence interval is mathematically represented as  

1010: 3030

is it i think

b. 2 and 4

step-by-step explanation: