According to the the national association of realtors, it took an average of three weeks to sell a home in 2017. data for the sale of 40 randomly selected homes sold in greene county, ohio, in 2017 showed a sample mean of 3.6 weeks with a sample standard deviation of 2 weeks. conduct a hypothesis test to determine whether the number of weeks until a house sold in greene county differed from the national average in 2017. use a 5 .05 for the level of significance, and state your conclusion.