A wine distributor hypothesizes that sales average 12000 per

A wine distributor hypothesizes that sales average $12,000 per month. A sample report of 10 months with a mean of $11,277 was selected. The standard deviation is $3,772. Using an alpha of 5 percent, is the distributor statistically confident? Using the alpha level and the DF (Degrees of Freedom). what is the critical-T for a 2-sided test as required in this case: A. 1.833 B. 2.228 C. 2.262 D. 6.314

Solution

The degree of freedom =n-1=10-1=9

Given a=0.05, t(0.025, df=9) =2.262 (from student t table)

Answer: C