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Health care workers who use latex gloves with glove powder on a daily basis are particularly susceptible to developing a latex allergy. A sample of 40 hospital employees who were diagnosed with a latex allergy based on a skin-prick test reported on their exposure to latex gloves. The sample mean is 34.9 and the standard deviation is 10.7 for the number of latex gloves they each used per week. What is the range of the 95% confidence interval for the average number of latex gloves used per week by all health care workers with a latex allergy (difference of the lower bound and upper bound) based on this sample? Round your final answer to two decimal places as needed