You have joined a major producer of soap. A sample of 40 boxes of soap were weighed and you found that the sample standard deviation was 1.05 pounds. Having no other information use this standard deviation for your estimate of the population standard deviation. Suppose you wish to sample enough boxes of soap to be within 0.20 pounds of the true mean of the population weight of the boxes of soap. You can assume a normal distribution for the weight of the boxes of soap. What sample size is needed