A random sample of 103 full-grown lobsters had a mean weight of 22 ounces and a standard
deviation of 3.8 ounces. Construct a 98% confidence interval for the population mean µ.

21 oz

Question

A random sample of 103 full-grown lobsters had a mean weight of 22 ounces and a standard
deviation of 3.8 ounces. Construct a 98% confidence interval for the population mean µ.

 21 oz < µ < 24 oz 
 21 oz < µ < 23 oz 
 22 oz < µ < 24 oz
 20 oz < µ < 22 oz

mathmale · Answer

Tips:  You'll need to find (or look up) the "z-critical value" for a 98% confidence interval.  What is the formula for the "margin of error?"  It includes the "z-critical value."  What is the sample size, n?

tomfoolery1 · Answer

i got 2.33

mathmale · Answer

The formula for the confidence interval in question looks like this:|dw:1464020208889:dw|