The standard deviation of the population of men's collar sizes is 1.02 inches. A random sample of 12 men was selected and yielded a mean collar size of 15.50 inches.
a. Calculate the standard error of the mean.
b. Use the z test to establish whether this sample could represent the population of men's collar sizes which is known to have a mean of 15 inches.

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The Answer of The standard deviation of the population of men's collar sizes is 1.02 inches. A random sample of 12 men was selected and yielded a mean collar size of 15.50 inches.
a. Calculate the standard error of the mean.
b. Use the z test to establish whether this sample could represent the population of men's collar sizes which is known to have a mean of 15 inches.

The Standard Deviation of the Population of Men's Collar Sizes