Question

Use only the information in the following table for the next few questions.  The following statistics represent samples of copper wire submitted by two companies for tensile strength testing (psi).

Statistic                                                      Company A          Company B

Arithmetic Mean                                       500                         600

Median                                                       500                        500

Mode                                                           500                       300

Standard Deviation                                   40                          20

Mean Absolute Deviation                         32                        16

Quartile Deviation                                     25                         14

Range                                                       240                         120

Sample Size                                          100                           80

(A) The middle 95% of the wires from Company A tested between _____ and _____.  Record ONLY the lower limit as a whole number.

(B) The middle 50 percent of the wires of Company A tested between _____ and _____.  Record ONLY the lower limit as a whole number.

(C) Which company's distribution has the larger dispersion (answer either 'A' or 'B')?

(D) The variance for Company A is _____?

Answer 1