Chemistry
Chemistry, 16.07.2019 07:00, Jasten

Which activity might to increase the validity of this experiment? 1) repeating the experiment several times 2) using two different types of euglena in each tank 3) using the same concentration of nitrate solution in each tank 4) placing the euglena tank in darkness

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Biology, 17.07.2019 06:28, johnsonkia873
Abiology class is conducting an experiment to determine how soil ph may affect the germination of pine seedlings. three pine seeds are placed in a pot of soil with a ph of 6.5, and three pine seeds are placed in a pot of soil with a ph of 4.0. after one week, the students count the number of seeds which have germinated and determine the mass of each pine sprout. which of these is the best way to improve the accuracy and validity of the data in this experiment? a) repeat the experiment with other types of seeds b) repeat the experiment using soils of different ph c) increase the sample size by using additional pots and seeds d) increase the number of independent variables in the experiment
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Physics, 31.07.2019 02:20, tiap1011
Juanita has done her experiment twenty times, and has gotten the same result every time. what would be the best thing for her to do to increase the validity of her results? a. throw out her results and start over. b. do the experiment twenty more times. c. ask a peer to do the experiment a few times. d. change her variables and do a different experiment.
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Biology, 23.10.2019 18:20, DM3449
An experiment was carried out to answer the question “does the ph of water affect the growth of radish plants? ” two groups of ten radish plants were set up. one group was watered with water having a ph of 3.0, and the other group was watered with water having a ph of 7.0. both groups of plants received the same amount and intensity of light, the same amount of water, and they were grown in the same type of soil. the heights of the radish plants were measured every 2 days for a period of 2 weeks. -- which sentence is a possible hypothesis that was tested in this experiment? (1) does the ph of water affect the growth of radish plants? (2) will the amount of water alter the heights of the radish plants? (3) the temperature of the water will affect the heights of the radish plants. (4) the ph of the water will affect the heights of the radish plants. -- what was the dependent variable in this experiment? (1) heights of the plants (3) temperature of the water (2) ph of the water (4) type of soil -- which activity might to increase the validity of this experiment? (1) repeating the experiment several times (2) using two different types of radish seeds in each group (3) using the same ph for both groups of plants (4) placing one set of plants in sunlight and one in darkness
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