Doctor’s Degree: Years of Study Does the average length of time to earn a doctorate differ from one field to another? Independent random samples from large graduate schools gave the following averages for length of registered time (in years) from bachelor’s degree to doctorate. Sample A was taken from the humanities field, and sample B from the social sciences field (Reference: Education Statistics, U.S.

Department of Education).

Field A 8.9 8.3 7.2 6.4 8.0 7.5 7.1 6.0 9.2 8.7 7.5 Field B 7.6 7.9 6.2 5.8 7.8 8.3 8.5 7.0 6.3 5.4 5.9 7.7 Use a 1% level of significance to test the claim that there is no difference in the distributions of time to complete a doctorate for the two fields.

AppendixLO1