You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "chi_square_independence_test", "description": "Performs a Chi-Square test for independence on a 2x2 contingency table.", "parameters": {"contingency_table": {"description": "A 2x2 contingency table represented as a list of lists.", "type": "List[List[int]]", "default": 0.05}, "significance_level": {"description": "The significance level for the Chi-Square test. Defaults to 0.05.", "type": "float, optional", "default": 0.05}}}]
Conduct a Chi-Square test to determine if there is a significant difference in the preference of two brands of smartphones among 50 tech enthusiasts and 50 casual users, given that 35 enthusiasts prefer Brand A and 15 prefer Brand B, while 20 casual users prefer Brand A and 30 prefer Brand B. Use a significance level of 0.01.
user
assistant
[{"name": "chi_square_independence_test", "arguments": {"contingency_table": [[35, 15], [20, 30]], "significance_level": 0.01}}]