Answer:
A sample of 17 must be selected.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Z-table as such z has a p-value of 
.
That is z with a pvalue of 
, so Z = 2.054.
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
The standard deviation from a previous study is 4 hours.
This means that 
How large a sample must be selected if he wants to be 96% confident of finding whether the true mean differs from the sample mean by 2 hours?
A sample of n is required.
n is found for M = 2. So
Simplifying both sides by 2:
Rounding up:
A sample of 17 must be selected.
Answer:
(a)3.15,(b)10.1,(c)5.0,(d)6.00,(e)21.8,(f)3.1
Answer:
27 gallons
Step-by-step explanation:
Our equation is: 
What do we need to find: x
We need to first find x, so lets find x first.
=> 
=> 
=> x = 27
Lets go back to our equation.
We are going to simplify this before solving this. We are going to get:
=> 18 = 18
Therefore, we found x and we checked that our x value is correct. Now, we need to find how many gallons can the container can hold.
[a = gallons can the container hold]
=> x = a
Basically that means the container can hold 27 gallons of water.
Please give me brainliest if this is helpful ;D
