Suppose a random sample of 18 uber drivers was taken, and the average age Xof these drivers was found to be 27.5 years. Construct a 99% confidence interval for the mean age () of all drivers.

Assume that the age of drivers is normally distributed with a population standard deviation () of 2.3 years.

1)The standard error (SE) ofX is

2)The critical value (CV) used for a 99% interval estimate is

3)The 99% confidence interval estimate of is

4)The company claims that average age of drivers is 26.9 years.In light of the sample evidence and at the 1% level of significance, is it justified ?

5)If we decrease the confidence level (1-) from 0.99 to 0.95, the margin of error (ME) of the confidence interval estimate will

please show step by step, equations . dumbproof it to the best of your ability