Polly did an experiment with marbles in a glass bowl to show the movement of particles in solids, liquids, and gases. the experimental set-up is shown below: a glass bowl is shown with four marbles inside it. what should polly do to represent the particles of a solid? pack the bowl with marbles and then tap it gently. add two more marbles to the bowl and then shake it slowly. take out two marbles from the bowl and then shake it vigorously. add water to the bowl so that the marbles start sliding past one another.

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Adirect relationship can be represented by: a curve a pie chart