kiwi Investigation Achieved Only
PROBLEM
I wonder if the median weights of male kiwi tend to be greater than the median weights of female kiwi back in the population. From my own observations, the males of most species tend to be larger or heavier than the female so I expect this to occur with kiwi too.
PLAN
I will take my random sample from NZGrapher. The sample size is 364 female and 336 male kiwi. NZGrapher will generate a dot plot and a box and whisker graph with 5 number summaries so I can analyze and make a conclusion about which gender of kiwi is heavier.
I wonder if the median weights of male kiwi tend to be greater than the median weights of female kiwi back in the population. From my own observations, the males of most species tend to be larger or heavier than the female so I expect this to occur with kiwi too.
PLAN
I will take my random sample from NZGrapher. The sample size is 364 female and 336 male kiwi. NZGrapher will generate a dot plot and a box and whisker graph with 5 number summaries so I can analyze and make a conclusion about which gender of kiwi is heavier.
DATA
ANALYSIS
Central Tendency:
The median weight for female kiwi is greater at 2.90 kg and the median weight for male kiwi is 2.25 kg, a difference of 0.65 kg. This indicates that the average female kiwi could be heavier than average male kiwi back in the population (data base sample of NZGrapher).
Spread:
The IQR (middle 50%) for female kiwi weight is 0.57 kg whereas the IQR for male kiwi weight is 0.36 kg. This indicates that there is more variation in the weights of female kiwi. Overall visually the female kiwi seem to be more spread out than the male kiwi.
From the dot plot I can see that the graph shapes for both male and female kiwi are shaped like a bell. However, the female dot plot is wider than the male dot plot. This means there is more of a variety of weights for female kiwi than the males. This also means that there is a greater range of weights for female kiwi.
The median weight for female kiwi is greater at 2.90 kg and the median weight for male kiwi is 2.25 kg, a difference of 0.65 kg. This indicates that the average female kiwi could be heavier than average male kiwi back in the population (data base sample of NZGrapher).
Spread:
The IQR (middle 50%) for female kiwi weight is 0.57 kg whereas the IQR for male kiwi weight is 0.36 kg. This indicates that there is more variation in the weights of female kiwi. Overall visually the female kiwi seem to be more spread out than the male kiwi.
From the dot plot I can see that the graph shapes for both male and female kiwi are shaped like a bell. However, the female dot plot is wider than the male dot plot. This means there is more of a variety of weights for female kiwi than the males. This also means that there is a greater range of weights for female kiwi.
CONCLUSION:
Based on looking at my sample I am reasonably confident that back in the population of all kiwi in New Zealand that the median weight of female kiwi tends to be greater than the median weight of male kiwi.