The following data represent the growth of a population of fruit flies over a 6-week period. Test the following models by plotting an appropriate set of data. Estimate the parameters of the following models.
Given to test the following models by plotting the appropriate set of data;
| | 7 | 14 | 21 | 28 | 35 | 42 |
| | 8 | 41 | 133 | 250 | 280 | 297 |
(a)
The objective is to test the given the model
by plotting the graphs
now consider the table as,
| | 7 | 14 | 21 | 28 | 35 | 42 |
| | 8 | 41 | 133 | 250 | 280 | 297 |
The model states that
is proportional to
.
Now follow these steps to draw the graph and obtain the model function:
Step 1: First insert the data in the excel sheet.
Step 2: Now select the data insert and click on the insert button from the toolbar located on the top of the sheet and click on the scatter plot.
Step 3: Now right click on any point shown in the scatter plot that we get from step 3 and choose add trendline.
Step 4: Now tick on the linear graph and display equation which shows the equation as,
Therefore, the parameter is 
(b)
The objective is to test given model
by plotting graph and
It can be seen that
is proportional to 
Now take logarithm on both sides and get;

Now make a table containing value of P,
and
as;
| P | log P | t |
| 8 | 0.90 | 7 |
| 41 | 1.61 | 14 |
| 133 | 2.12 | 21 |
| 250 | 2.40 | 28 |
| 280 | 2.45 | 35 |
| 297 | 2.47 | 42 |
Now follow step shown below to draw graph from the table and to get the model function.
Step 1: First insert the data in the excel sheet.
Step 2: Now select the data insert and click on the insert button from the toolbar located on the top of the sheet and click on the scatter plot.
Step 3: Now right click on any point shown in the scatter plot that we get from step 3 and choose add trendline.
Step 4: Now tick on the logarithmic graph and display equation and the equation will be display as,

Therefore, the parameter is 