# Question

Manufacturing specifications are often based on the results of samples taken from satisfactory pilot runs. The following data resulted from just such a situation, in which eight pilot batches were completed and sampled. The resulting particle sizes are in angstroms (where 1 Å = 10_8 cm):

3923 3807 3786 3710 4010 4230 4226 4133

a. Find the sample mean.

b. Find the sample standard deviation.

c. Assuming that particle size has an approximately normal distribution, determine the manufacturing specification that bounds 95% of the particle sizes (that is, find the 95% interval, ± 2s).

3923 3807 3786 3710 4010 4230 4226 4133

a. Find the sample mean.

b. Find the sample standard deviation.

c. Assuming that particle size has an approximately normal distribution, determine the manufacturing specification that bounds 95% of the particle sizes (that is, find the 95% interval, ± 2s).

## Answer to relevant Questions

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 ...Make up a set of 18 data (think of them as exam scores) so that the sample meets each of these sets of criteria: a. Mean is 75, and standard deviation is 10. b. Mean is 75, maximum is 98, minimum is 40, and standard ...Delco Products, a division of General Motors, produces commutators designed to be 18.810 mm in overall length. (A commutator is a device used in the electrical system of an automobile.) The following sample of 35 commutator ...The U.S. Census Bureau posted the following 2006 Report on America’s Families and Living Arrangements for all races. No. in Household Percentage 1............ 27% 2............ 33% 3............ 17% 4............ ...The speeds of 55 cars were measured by a radar device on a city street: a. Classify these data into a grouped frequency distribution by using class boundaries 12–18, 18–24, . . . , 48–54. b. Find the class width. c. ...Post your question

0