# Question

Refer to Exercise 19. There you selected a simple random sample of 49 units from a large shipment and found that the sample average breaking strength was 814 pounds. Assuming that the standard deviation of the breaking strengths for the population of units in the shipment is known to be 35 pounds, calculate the
a. Standard error of the sampling distribution of the sample mean that could be used here to estimate the population mean breaking strength.
b. Margin of error in a 95% confidence interval estimate of the mean breaking strength for all the units in the shipment.

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