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": "mean_confidence_interval", "description": "Calculates the confidence interval for a sample mean.", "parameters": {"std_dev": {"description": "The standard deviation of the sample.", "type": "float", "default": 0.95}, "sample_size": {"description": "The size of the sample.", "type": "int", "default": 0.95}, "mean": {"description": "The mean of the sample.", "type": "float"}, "confidence": {"description": "The desired confidence level. Default is 0.95.", "type": "float, optional"}}}]
For a study, I need to know the 98% confidence interval for a sample mean of 75 from a group of 150 with a standard deviation of 8. Can you help?
user
assistant
[{"name": "mean_confidence_interval", "arguments": {"std_dev": 8, "sample_size": 150, "mean": 75, "confidence": 0.98}}]