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# IB Genetic Lab

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Introduction

Genetics Lab Purpose The purpose of this experiment is to investigate the relationship between the length of arm span in centimeters, measured from the tip of the middle finger on the left hand to the tip of the middle finger on the right hand, and height in centimeters, measured from the bottom of the female's feet to the top of her head, of females from age 5 to 50 using a measuring tape. Hypothesis The length of the arm span measured in centimeters will equal or will be similar to the height measured in centimeters in females of any age. This will mean that there will be no significant difference between the two means of length of arm span and height. The arm span is often used to predict the height of males and females, and previous studies have been done to illustrate that there is an association between arm span measurement and height in all groups.1 Hence the length of arm span and height in females from age 5 to 50 will be similar or the same. Variables The independent variables are the phenotype; arm span of females of age 5 to 50 in centimeters, which is measured from the tip of the middle finger on the left hand to the tip of the middle finger on the right hand, and height of females of age 5 to 50 in centimeters, which is measured from the bottom of the female's feet to the top of her head. ...read more.

Middle

(� 0.1cm) Range of values (� 0.1cm) Standard deviation (s) t-value (t) Degrees of freedom (df) Critical value for P = 0.05 Arm-span 32 160.0 185.0 - 110.0 17.6 6.9 x 10-2 62 2.308 height 32 159.0 182.0 -112.0 16.9 Figure 2: The mean length of arm-span and height of females from age 5 to 50 in centimeters collected from personal surveys Conclusion When comparing the two means, 160.0cm and 159.0cm, as shown in Table 2 and Figure 2, there are no significant difference between the two means as hypothesized. This is supported by the fact that the t-value, which is 6.9 x 10-2, is smaller than the critical value at p=0.05, which is 2.308, as displayed in Table 1. Table 2 and Figure 2 that display the mean length of arm span and height, which are 160.0cm, and 159.0cm, respectively, indicate that the two values only differ by 1.0cm, which clearly demonstrate that there is no significant difference between the two data. Also in Figure 2, the two bars, which represent the mean length of arm span and height of females from age 5 to 50, barely depict any significant differences. This supports the hypothesis, which was that the length of arm span will be similar. The recorded values of arms span and height in Table 1 also support the hypothesis, for example, 170.0cm measured for the arm-length, which is very close to the value of 170.1cm recorded for height. ...read more.

Conclusion

measuring tape more accurately, and to ensure that the number on the measuring tape is parallel to the top of the head, and also ensuring that no extra height has been added with hair. This will improve the collection of accurate data in the investigation. Student's t-Test: Results The results of an unpaired t-test performed at 21:14 on 3-JUN-2008 t= 0.695E-01 sdev= 17.3 degrees of freedom = 62 The probability of this result, assuming the null hypothesis, is 0.945 Group A: Number of items= 32 110. 126. 129. 132. 134. 145. 148. 154. 155. 155. 155. 157. 162. 162. 164. 164. 166. 168. 168. 168. 169. 169. 169. 170. 170. 170. 171. 172. 180. 181. 182. 184. Mean = 160. 95% confidence interval for Mean: 153.5 thru 165.7 Standard Deviation = 17.6 Hi = 184. Low = 110. Median = 165. Average Absolute Deviation from Median = 12.7 Group B: Number of items= 32 112. 127. 129. 133. 134. 144. 153. 153. 154. 154. 155. 157. 160. 160. 161. 163. 163. 167. 167. 168. 168. 169. 169. 170. 170. 170. 171. 173. 180. 180. 181. 182. Mean = 159. 95% confidence interval for Mean: 153.2 thru 165.4 Standard Deviation = 16.9 Hi = 182. Low = 112. Median = 163. Average Absolute Deviation from Median = 12.4 1 "PubMed", NCBI, http://www.ncbi.nlm.nih.gov/pubmed/8793422. 2 "PubMed", NCBI, http://www.ncbi.nlm.nih.gov/pubmed/8793422. ?? ?? ?? ?? ...read more.

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