Answer: d. if we do not know the population standard deviation and must use the sample standard deviation.
Step-by-step explanation:
We use t-distribution is quite similar to distribution of z-score .
The interpretation of t-scores and z-scores are same.
T- distribution is used when the data is not accurately normal and when the population standard deviation is unknown.
In the absence of population standard deviation , we use the standard deviation of the sample.
So , We use a t distribution for inference about a population mean instead of the standard Normal distribution if we do not know the population standard deviation and must use the sample standard deviation.
Hence, the correct option is : d. if we do not know the population standard deviation and must use the sample standard deviation.
6y = 4x + 5
y = 2/3x + 5/6
gradient = 2/3
Answer:
$8.74
Step-by-step explanation:
If tina paid with a $20 bill and the cost of the game was $11.26 than we would subtract 11.26 from 20 to get the answer of $8.74 money she gets back
If the animal does not have 4 paws, then it is not a cat
