Level of significance

Calculate Spearman’s coefficient of ranks correlation from the following data:

Suppose that a day’s production schedule calls for 9000 items. Three machines A, B and C each with a daily production capacity of 4000 have the probability that an item is defective on them as 1, 2 and 4 percent respectively. On a given day 4000 items were produced on A, 4000 on B and 1000 on C. One item is selected at random and found defective. What is the probability that it was produced on either A or B?

Degree of freedom

Normal Distribution

Comment on the statement “Statistics is the science and art of handling aggregate of facts – observing, enumerating, recording, classifying and other wise systematically treating them.

Two types of batteries are tested for their length of life and the following data are obtained: