Complete Question
The complete question is shown on the first uploaded image
Answer:
The 95% confidence interval is
This means that there is 95% chance that the true population mean is within this interval
Step-by-step explanation:
From the question we are told that
The sample size is n = 30
The sample mean is
The population standard deviation is
Given that the confidence level is 95% then the level of confidence is evaluate as
Next we obtain the critical value of from the normal distribution table , the values is
Generally the margin of error is mathematically represented as
substituting values
The 95% confidence interval is mathematically represented as
substituting values
