You measure 20 dogs' weights, and find they have a mean weight of 44 ounces. Assume the population standard deviation is 2.6 ounces. Based on this, what is the maximal margin of error associated with...

You measure 20 dogs' weights, and find they have a mean weight of 44 ounces. Assume the population standard deviation is 2.6 ounces. Based on this, what is the maximal margin of error associated with a 90% confidence interval for the true population mean dog weight.