Answer:
Use the normal distribution if the population standard deviation is known.
Use the student's t distribution when the population standard deviation is unknown.
Explanation:
A mound-shaped distribution refers to the normal distribution.
A good sample size for testing against the normal distribution should be
n >= 30.
The condition for the sample size is satisfied.
However, we are not given the population standard deviation, therefore it is assumed to be unknown.
Therefore the student's t distribution should be used.
Answer:
She earned $8.5 per hour.
Step-by-step explanation:
110.5/13=8.5
Answer: 32
Step-by-step explanation:
He picked 30, right? Ok, so, after picking the peaches, he gave 10 of them to his granny. Then he picked 12 more peaches.
30-10=20
20+12=32
Answer:
cherry
Step-by-step explanation:
its really good
He needs to find the mean of the the heights. The mean is the average.