The standard deviation is lower for each group than it is for the groups combined.
Given
and
(say).
Then,

From the above 3 equations,

From the equations, we get

Since
, the negative value is rejected.

Answer:
yes
no
no
Step-by-step explanation:
Answer:
See explanation
Step-by-step explanation:
Selected theme park admission prices has the lower standard deviation.
Specific home stereo system's distribution is more spread out since the ratio between the standard deviation and the mean is greater compared to that of selected theme park admission prices.
specific home stereo system: 3.99/59=0.0676.
selected theme park admission prices: 4/1499=0.002668
0.0676>0.002668