A study of parental empathy for sensitivity cues and baby temperament (higher scores mean more empathy) was performed. Let x1 be a random variable that represents the score of a mother on an empathy test (as regards her baby). Let x2 be the empathy score of a father. A random sample of 34 mothers gave a sample mean of x1 = 69.04. Another random sample of 40 fathers gave x2 = 59.04. Assume that ?1 = 11.69 and ?2 = 11.59.     Let ?1 be the population mean of x1 and let ?2 be the population mean of x2. Find a 99% confidence interval for ?1 – ?2. (Round your answers to two decimal places.) lower limit upper limit

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