7.5 Central Limit Theorem (Cookie Recipes)

Central Limit Theorem (Cookie Recipes)

GivenX = length of time (in days) that a cookie recipe lasted at the Olmstead Homestead. (Assume that each of the different recipes makes the same quantity of cookies.)

Calculate the following:

1. μ_x = _______
2. σ_x = _______

Collect the DataUse a random number generator to randomly select four samples of size n = 5 from the given population. Record your samples in Table 7.5. Then, for each sample, calculate the mean to the nearest tenth. Record them in the spaces provided. Record the sample means for the rest of the class.

1. Complete the following table:

   	Sample 1	Sample 2	Sample 3	Sample 4	Sample means from other groups:
   Means:	$\overline{x}$ = ____	$\overline{x}$ = ____	$\overline{x}$ = ____	$\overline{x}$ = ____

   Table 7.5
2. Calculate the following:
   1. $\overline{x}$ = _______
   2. s_{$\overline{x}$} = _______
3. Again, use a random number generator to randomly select four samples from the population. This time, make the samples of size n = 10. Record the samples in Table 7.6. As before, for each sample, calculate the mean to the nearest tenth. Record them in the spaces provided. Record the sample means for the rest of the class.

   	Sample 1	Sample 2	Sample 3	Sample 4	Sample means from other groups
   Means:	$\overline{x}$ = ____	$\overline{x}$ = ____	$\overline{x}$ = ____	$\overline{x}$ = ____

   Table 7.6
4. Calculate the following:
   1. $\overline{x}$ = ______
   2. s_{$\overline{x}$} = ______
5. For the original population, construct a histogram. Make intervals with a bar width of one day. Sketch the graph using a ruler and pencil. Scale the axes.
   

   Figure 7.13
6. Draw a smooth curve through the tops of the bars of the histogram. Use one to two complete sentences to describe the general shape of the curve.