# Question

Delco Products, a division of General Motors, produces a bracket that is used as part of a power doorlock assembly. The length of this bracket is constantly being monitored. A sample of 30 power door brackets had the following lengths (in millimeters):

a. Without doing any calculations, what would you estimate for the sample mean?

b. Construct an ungrouped frequency distribution.

c. Draw a histogram of this frequency distribution.

d. Use the frequency distribution and calculate the sample mean and standard deviation.

e. Determine the limits of the ± 3s. interval and mark this interval on the histogram.

f. The product specification limits are 11.7–12.3. Does the sample indicate that production is within these requirements? Justify your answer.

a. Without doing any calculations, what would you estimate for the sample mean?

b. Construct an ungrouped frequency distribution.

c. Draw a histogram of this frequency distribution.

d. Use the frequency distribution and calculate the sample mean and standard deviation.

e. Determine the limits of the ± 3s. interval and mark this interval on the histogram.

f. The product specification limits are 11.7–12.3. Does the sample indicate that production is within these requirements? Justify your answer.

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