Answer: z score = 0.00714
Step-by-step explanation: the value of test statistics is gotten using the standard normal distribution table.
Z= 2.45 has area to the left (z<2.45) and area to the right (z>2.45).
Level of significance α is the probability of committing a type 1 error. The area under the distribution is known as the rejection region and it is the area towards the right of the distribution.
The table I'm using is towards the left of the distribution.
But z>2.45 + z<2.45 = 1
z> 2.45 = 1 - z<2.45
But z < 2.45 = 0.99286
z > 2.45 = 1 - 0.99286
z >2.45 = 0.00714
Hence the test statistics that would produce the least type 1 error is 0.00714
Answer: No, it does not appear to be normal.
A normal distribution has very specific characteristics:
- it is bell-shaped: it starts at a low value, then it increases to a maximum value, then it decreases to a low value again;
- it is symmetric;
- it is single-peaked.
The data table is not complete, but it is enough to give an answer.
Let's see how the frequencies change: we have 2, 0, 4, 12,...
The frequencies start from a low value, but at first, they decrease to a lower value right before increasing to a maximum value.
We don't know how they change after the maximum value, but from the first part of the curve, we can see that it is not bell-shaped, because it decreases before increasing. Probably, it won't be symmetric either.
Hence, we can say that using a strict interpretation of the relevant criteria the frequency distribution does not appear to be normal.
Answer:
awan ko sayo magsagot ka ng sarili mo
