How many known elements exist? PL HELP PL A. about 100
B. fewer than 50
C. exactly 75
D. 1,000

When two or more atoms link together they are called .

A. a shell
B. an electron
C. a molecule
D. a cluster

Mass is .

A. the length of an atom’s nucleus
B. the center of a compound
C. another name for mixtures that go together
D. the amount of matter in an object

Quadrilateral abcd is a parallelogram with diagonals that intersect at point e. which of the following statements is true?

The quotient of 15 and a number is 1 over 3 written as an equation

You are in charge of the customer service phone line with many employees. at the end of each phone callthe customers are asked to rate their service from 1 to 5 stars, with 5 being the best. you find the averagerating for 20 randomly selected employees and decide you want to improve the ratings so you require thoseemployees to go through a new training program. you then wait a week and find the new average rating foreach employee. the average change is an increase in 1.3 stars with a standard devation of .9 stars.(a) is this data paired or not paired? (b) what are the null and alternative hypothesis being tested? (c) what is the t-statistic you would use? write the general formula and the final calculation.(d) sketch a t-distribution, label your t-statistic and the probability you would be interested in: