Answer:
Step-by-step explanation:
Tthe population is normally distributed and the sample size is 
.
Since the population standard deviation 
is unknown and the sample standard deviation 
, must replace it, the t distribution must be used for the confidence interval.
Hence with degrees of freedom of 21, 
.(Read from the t distribution table)
The 98% confidence interval can be constructed using the formula:
.
From the question the sample mean is 
dollars and the sample standard deviation is 
dollars.
We substitute the values into the formula to get
Therefore, we can be 98% confident that the population mean is between is between 19.22 and 44.78 dollars.
Answer:
Step-by-step explanation:
the 4 one
Answer:
Yes
Step-by-step explanation:
Scientific notation is a way of writing very large or very small numbers. A number is written in scientific notation when a number between 1 and 10 is multiplied by a power of 10. For example, 650,000,000 can be written in scientific notation as 6.5 ✕ 10^8. and that is something Very similar.
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B. 113.04
we know this by using the area method A=(pie)r^2
you add 6 into the r so (pie)6^2 wich equals 113.04
