Lab 1: Introduction to Science
Exercise 1: Data Interpretation
Table 4: Water Quality vs. Fish Population
Dissolved Oxygen (ppm)
0
2
4
6
8
10
12
14
16
18
Number of Fish Observed
0
1
3
10
12
13
15
10
12
13
Questions
1. What patterns do you observe based on the information in Table 4?
2. Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water.
3. What would your experimental approach be to test this hypothesis?
4. What would be the independent and dependent variables?
5. What would be your control?
6. What type of graph would be appropriate for this data set? Why?
7. Graph the data from Table 4:
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He tells his son that if he can guess the amount of money he is holding within 5% error he can have the money. The son guesses that he is holding 81 cents. The dad opens his hand and displays 90 cents. Did the son guess close enough to receive the money from his father?
2. A science teacher tells her class that their final project requires the students to measure a specific variable and determine the velocity of a car with no more than 2.5% error. Jennifer and Johnny work hard and decide the velocity of the car is 34.87 m/s. The teacher informs them that the actual velocity is 34.15 m/s. Will Jennifer and Johnny pass their final project?
3. A locomotive train is on its way from Chicago, IL to Madison, WI. The trip is said to last 3.15 hours. When the train arrives in Madison the conductor notices it actually took them 3.26 hours. The train company prides itself on always having its trains to the station within a 3% error of the expected time. Will the train company live up to its reputation on this trip?
4. A coach tells his little league players that hitting a .275 batting average, within 7% percentage error, means that they had a really great season. Seven year old Tommy ended the season hitting a .258 batting average. According to his coach, did he have a great season?
Experiment 1: Diffusion through a Liquid
Table 5: Diffusion through Corn Syrup (Data and Rates)
Dye Color
Molecular
1. Use the graph below to predict what the results will look like if the null hypothesis is
each ObScertainer. I formed a hypothesis for each one, then I took retests to make more
There were three different runs in order to have comparable data and to increase the validity of the experiment. The first run gave 39% of Sodium Bicarbonate. The second run gave 34% of Sodium Bicarbonate while the third one gave 39%, which is the same as the first run. The average percentage was 37% which is much lower than the manufacturer's percentage of 59%. The percent error came out to be -37%.
Select one (1) project from your working or educational environment that you would use the hypothesis test technique. Next, propose the hypothesis structure (e.g., the null hypothesis, data collection process, confidence interval, test statistics, reject or not reject the decision, etc.) for the business process of the selected project. Provide a rationale for your response.
The procedure for this experiment followed the steps as shown in the flow chart (Figure 1) and will be expanded upon here. The oxygen-measuring probe in the test chamber was first turned on and required 10 minutes to warm up. During this time, two empty containers had 200mL of fish water added to them and then each was weighed using a scale that was tared to zero before use. Two pairs of goldfish were then collected from the large tank #1 in the lab room using the fish net provided, and one pair was placed in each container. Then, the containers were reweighed separately and the original weights were subtracted from the new weights in order to determine each pair of goldfish’s weight. Two trials were conducted and in each trial, each goldfish pair was subjected to two conditions, first a control condition where no factors were introduced, followed by an experimental condition where they were exposed
Explain how the data collected will provide the data necessary to support or negate the hypothesis or proposition
7. Graph the data from Table 1: Water Quality vs. Fish Population (found at the beginning of this exercise). You may use Excel, then “Insert” the graph, or use another drawing program. You may also draw it neatly by hand and scan your drawing. If you choose this option, you must insert the scanned jpg image here.
2. A science teacher tells her class that their final project requires the students to measure a specific variable and determine the velocity of a car with no more than 2.50% error. Jennifer and Johnny work hard and decide the velocity of the car is 34.87 m/s. The teacher informs them that the actual velocity is 34.15 m/s. Will Jennifer and Johnny pass their final project?
2. Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water.
The scenario for this case study is that you notice that the grass around my house is brown, short, and dead. The grass around my neighbor's house is green, tall, and alive. Utilizing my understanding of the Scientific Method, my intent is to explain what the problem is to develop a hypothesis. After developing the hypothesis I will then design and perform an experiment to test my hypothesis; analyze my data and reach conclusions regarding my hypothesis. I will
The alternative hypothesis was that the metabolic rate of goldfish in ambient light verse no light, as measured by oxygen consumption, would differ. The null hypothesis was that the metabolic rate of goldfish in ambient light verse no light, as measured by oxygen consumption, would not differ. Results There was a total of 8 different trials and each trial had 2 different goldfish. Thus, the sample size was 16 goldfish.
The performance had to be forced in a bell curve like curve where high performers could be maximum of 14%; Achievers (A) min 70%; Low Achievers (L) min 7% and Unacceptable (U).
Research Design: The independent variable of this project would be if there is already money in the tip jar. Furthermore, the independent variable can also be when there is no money in the tip jar. Thus, the two levels are there is money in the tip jar (this receives larger tips) or there is no money in the tip jar (receive less tips than you would if there is money in the tip jar). As people enter the bar and go to the bar the experimenter will roll the die and determine what group the person will be assigned to, the experimental (money in the jar) or the control (no money in the jar). At the same time the research
2) Compute the standard deviation for each of the four samples. Does the assumption of .21 for the population standard deviation appear reasonable?