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Determine the effect of average height of males and females and whether their mean heights are more or less the same

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´╗┐BIOLOGY ? GENETICS LAB: AIM: To determine the effect of average height of males and females and whether their mean heights are more or less the same, as investigated in the Grade 11 IB students at Indus International School. BACKGROUND INFORMATION: Average height for men and women within a population varies a lot, and men, 9 times out of 10 taller than women. Majority of females reach terminalheight at a younger age than males, as puberty happens first in girls.A person's height is decided by genetic causes, research shows that height is but an inherited trait. Parents may worry that a short child is a consequence of an intrinsic health problem in the child; doctors now are able to crunch DNA trends as a fairly accurate predictor of height. The gender of the child also factors. ...read more.


DEPENDENT VARIABLE: Heights of the students involved in the experiment. CONTROLLED VARIABLE: The age, maintained between 18-21 years. VARIABLE: MEASUREMENT: SIGNIFICANCE: Independent By keeping the number constant. Dependent Using the measuring tape Will help us to determine the chronology of their heights Controlled Age Makes sure that there is not too much variation in the heights APPARATUS: 1. 10 male and 10 female Grade 11 IB students. 2. Ruler±0.1 mm 3. Measuring tape±0.76 mm PROCEDURE: 1. Gather the students taking part in the experiment. 2. Individually, ask them to remove their shoes and stand erect against a wall. 3. Keep a ruler on their head and mark the highest point. 4. Using a measuring tape, measure the height of the individual 5. Tabulate the reading 6. Repeat the procedure for 10 male as well as 10 female students 7. Create a comprehensive table tabulating their age, sex and height in centimetres. ...read more.


(173+175)/2 =174cm MODE: Mode is the number that is most frequently repeated throughout the sequence Thus, mode for this sequence = 163 Likewise, these calculations are also made for the female heights. MALE HEIGHTS: MEAN:174.92 cm MEDIAN:173 cm MODE: 163cm FEMALE HEIGHTS: MEAN: 169.55 cm MEDIAN: 176 cm MODE: 170 cm CONCLUSION AND EVALUATION: Thus the mean height of the males is more than the mean height of the females. This could be due to a number of factors, ranging from the testosterone hormone in males, to the heights of the individual?s parents and ancestors. It also depends on the diet followed as well as the activeness of the child. Thus boys being more active and sporty, are generally taller than girls. SCOPE FOR IMPROVEMENTS: 1. Increased specimens could be used for clearer data and evaluation. 2. Better equipment could be used for more accurate data. 3. A number of tests such as the t-test and chisquared test could be performed for better conclusion and evaluation. ...read more.

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