Does the hypothesis 'Based on our 1992 survey, we estimated lead times for two different   standard  lead times that represent performance for a typical product in the supplier's selection and  shortest  lead times that indicate a supplier's best practice.' logically conflict with the premise 'We did not carry out any surveys in 1992.'
Based on our 1992 survey, we estimated lead times for two different   standard  lead times that represent performance for a typical product in the supplier's selection and  shortest  lead times that indicate a supplier's best practice.###We did not carry out any surveys in 1992.