Answer:
D. Confidence interval decreases.
Step-by-step explanation:
Central Limit Theorem
The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean
and standard deviation
, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean
and standard deviation
.
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean
and standard deviation 
When sample size increases:
The standard deviation of the sample mean is:

That is, it is inversely proportional to the sample size, so if the sample size incerases, the standard deviation decreases, and so does the confidence interval.
This means that the correct answer is given by option D.
Answer:
$47.50
Step-by-step explanation:
530-150=380
380/8=47.50
Answer:
Step-by-step explanation:
G
Answer:
If your money earns a 5 percent interest rate, it will triple in 23 years (115 divided by 5 equals 23).
Step-by-step explanation:
Answer:
y= $1.50x
Step-by-step explanation:
Each bagel is $1.50,therefore for each family member(x) the amount increaes by the same rate