In Statistical Quality Control, which of the following should be treated as an attribute characteristic? I. The length of a bolt. II. The diameter of a clutch wheel. III. The proportion of subway trains that arrive on time. IV. The percent of defective units produced on a production line in a fifteen minute period. V. The weight of an engine block.

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Yesterday, george drank 1 small bottle and 2 large bottles, for a total of 1,372 grams. the day before , he drank 1 small bottle and 1 large bottle, for the total of 858 grams. how many grams does each bottle hold?