If the p-value indicates a lack of a statistical difference: •Does this indicate that the null hypothesis has been confirmed? Explain your answer, taking into account sample sizes, experimental design (e.g., wet vs.dry specimens), and possible confounding factors. Null Hypothesis: There is no significant difference in the Paramecium species used for the dry mount and the wet mount. Wet Paramecium Length Mean: 151.67 Dry Paramecium Length Mean: 168.68 Wet Paramecium Length Standard Deviation: 29.00304244 Dry Paramecium Length Standard Deviation: 34.06864416 p value: 0.110295704 Since the p value of 0.110295704 is greater than 0.05, therefore we conclude that there is a lack of a statistical difference. This does not mean that the null hypothesis has been guaranteed to be correct, but that there is a possibility that it could be and that there is no significant difference between the two variables of the length of the paramecium of the wet mount and that of the dry mount. We have to take into account various confounding variables that could have affected our results, such as having difficulty in measuring the size of the wet paramecium, or the difference in test tubes and environments for the paramecium. The sample size was moderately large, and from this, we infer that the two paramecium preparations could belong to the same species. (4)INDIVIDUAL: Discuss the demonstration material.(a.)Submit several digital images and/or sketches of specimens you observed in the lab. See specimen 1, 2, 3, 4 and 5 attached. (b.)Based on your own observations in the lab, which external and internal cellular structures do the organisms appear share? Which cellular structures appear unique? (c.)Relate any cellular functions/processes you observed by discussing what you know about these – how they work, what molecules might be involved, etc .
Group Members: _____ _______________ _____________________________Exercise_______Date: ___________ LI ______________________ Unique __________ Day: __________ Room: _______ Lab Start Time ________ Exercise 1 Page 5 of 8 In Elodea, the cell wall is important because it supports the cell and gives it mechanical strength. The cell wall prevents the cell membrane from bursting in a hypotonic medium. It also controls the rate and direction of cell growth and regulates cell volume. Chloroplasts carry out photosynthesis and make food or the cell. The cellular membrane in these organisms helps to separate the interior components of the cell from the exterior. It is partially permeable therefore it only lets in some molecules and not others. The food vacuoles of the cells store food, water and waste. These are taken up by endocytosis and released by exocytosis.
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- Spring '08
- Standard Deviation, Null hypothesis, Statistical hypothesis testing, Statistical significance