Amount Of $ Spent on Lunch in CHS
By: Sonakshi Chaturvedi and Tan Yan; p. 5
Question: Does the gender of a person affect how much money they will spend on food on any given day?
Hypothesis: Males in Coppell High School will spend more money on lunch than females.
Type of Investigation: Comparative
Parts of the Experiment:
Dependent variable: Amount of money spent on lunch.
Independent variable: Gender
Experimental groups: Male students and female students
Two factors held constant: Time at which the subjects have lunch (C lunch), Available food prices (CHS lunch menu prices)
Range of Average $ Spent on lunch in CHS
Based on evidence from the data table and bar graphs, it is concluded that gender does not affect how much money one will spend on lunch, and that male students did not spend more money on lunch than female students, meaning the original hypothesis was incorrect. The T-test shows that the p-value of the hypothesis is 0.056989931, meaning that it only has a 5.7% chance of being true, a much too small probability to be able to justify its validity. Both of the bar graphs depict that the average amount of money spent on lunch by males, $3.23, was less than that of females, $4.06. In addition, the error bars for both the plus or minus two standard error of the mean, $2.60 to $3.86 for males and $3.26 to $4.87 for females, and the range of data, $1.25 to $5.00 for males and $1.75 to $6.15 for females, showed quite a bit of an overlap, suggesting that there may not have been a significant difference in the true mean or range of the two groups, and the independent variable, gender, didn't have a statistically significant enough effect on the result. However, this conclusion does not come into congruence with the prevalent scientific theory today that the average male will consume more calories than the average female (Harvard Medical School; Rolls), regardless of age and/or stage of puberty (Shomaker). This discrepancy may be explained by the fact that females, starting from early adolescence, are more inclined to commit to self-dieting (Lattimore), make healthier food choices, and in greater frequency (Bere; Shelley) than males due to the social and cultural perceptions of body fitness (Rolls). This, combined with the generally higher prices of healthier foods compared to that of less healthy foods, may serve as a plausible explanation as to why male students did not spend more money on lunch than female students.
Sources of Error and Inaccuracies
Bere, Elling, Johannes Brug, and Knut-Inge Klepp. "Why do boys eat less fruit and vegetables than girls?." Public health nutrition 11.03, Mar. 2008: 321-325.
Harvard Medical School. "Good Nutrition: Should Guidelines Differ for Men and Women?" The Family Health Guide. Harvard Health Publications, Sept. 2006. Web. 06 Sept. 2015.
Lattimore, Paul J., and Jason CG Halford. "Adolescence and the diet‐dieting disparity: Healthy food choice or risky health behaviour?." British journal of health psychology 8.4 (2003): 451-463.
Martin, Jennifer. “Designing a Scientific Questionnaire” Designing a Scientific Questionnaire.pdf. n.d. Web. 8 Sept. 2015
Martin, Jennifer. “Designing a Scientific Questionnaire Online Poster” Designing a Scientific Questionnaire miniposter.pdf. n.d. Web. 8 Sept. 2015
Martin, Shelley. “Surprise! Women Eat Healthier than Men.” CMAJ: Canadian Medical Association Journal 167.8, 15 Mar. 2002: 913. Print.
Rolls, Barbara J., Ingrid C. Fedoroff, and Joanne F. Guthrie. "Gender differences in eating behavior and body weight regulation." Health Psychology 10.2 (1991): 133.
Shomaker, Lauren B et al. “Puberty and Observed Energy Intake: Boy, Can They Eat!” The American Journal of Clinical Nutrition 92.1 (2010): 123–129. PMC. Web. 6 Sept. 2015.
Weinstein, Suzanne E., David J. Shide, and Barbara J. Rolls. "Changes in food intake in response to stress in men and women: psychological factors." Appetite 28.1 (1997): 7-18.