If it is the same experiment attached to link, you would need only 1 trial each unless you want to retry if there is more grain or shape distribution. There is no requirement for how many time in repeating experiment since it is observation experiment not measuring experiment.
If , in the course of your experiment, you run repeated trials with differing results, it is necessary to ensure that only one variable is changing for each experiment. Recheck the data collected for errors.
If you are meaning how many apps you can run with the app store up the answer is as many as you want/have. However if you mean how many apps you can run inside the store the answer is none because there is no trials in the app store just screen shots.
One can find clinic trials being run by the Government from websites like Clinical Trials, NCCAM, CTC, CISCRP, Moga, NHS, Cern-Foundation and Mesorfa.
Sand carting is big trucks that deliver sand to our beaches so we don't run out of sand.
Trial
It is an experiment you run before the main one in order to figure out if your experiment does what it is supposed to do, which is render a result which addresses the question at hand. It is often very important to run a preliminary because often things can go run in an experiment which causes very important resources to be thrown out.
Sand cats can run very quickly. They can run up at 25 miles per hour for about 400 meters when needed.
nah
The type of sand you run on influences the difficulty of the workout -- if you are a beginner, you should run on damper sand, but if you have more experience or if that is too easy for you, run on looser, dry sand for a better workout.
Everything except what you're measuring. EXAMPLE: In a biological experiment using specially treated cells the experiment is run with the cells; this is the experiment. Then the experiment is run again with the same cells WITHOUT the special treatment; this is the control.
The sand worms normally cannot be harmed unless you place a bomb on the floor of the sand, after doing this run to a part of the floor that isn't sand and the worm should eat the bomb and be destroyed in one hit.
To eliminate confounding variables, or variables that were not controlled and damaged the validity of the experiment by affecting the dependent and independent variable, the experimenter should plan ahead. They should run many checks before actually running an experiment.