Answer:
The 90% confidence interval for the population standard deviation waiting time for an oil change is (3.9, 6.3).
Step-by-step explanation:
The (1 - <em>α</em>)% confidence interval for the population standard deviation is:

The information provided is:
<em>n</em> = 26
<em>s</em> = 4.8 minutes
Confidence level = 90%
Compute the critical values of Chi-square as follows:


*Use a Chi-square table.
Compute the 90% confidence interval for the population standard deviation waiting time for an oil change as follows:


Thus, the 90% confidence interval for the population standard deviation waiting time for an oil change is (3.9, 6.3).
Answer:
-8
Step-by-step explanation:
just do the promble backwards
3.5 times 2 = 6
6-8=-2
-2 times 4 = -8
or solve for x
x/ 4 + 8 /2=3.5
Answer:
(-3,-5)
Step-by-step explanation:
because it as the information triangle y
Answer:
This isn't in second gradee- x-x
Step-by-step explanation: