# I need my weekly assignment completed. It goes along with a online book that I can provide access to.

Answer the following

questions in a word processing document and upload to the assignment.

1. Explain what probability is and how you calculate it.

2. Why is random sampling important in statistics?

3. Explain sampling error. Why is it a problem in research?

4. What is the region of rejection, and how do we use it?

5. You have a sample with a mean of 46 and a standard deviation of 8.

What is the probability of randomly selecting:

a) a score above 64?

b) a score between 40 and 50?

6. The population from the sample in problem 5 was randomly drawn has a Âµ of 51 and o_{x} of 14. What

is the probability of obtaining a random sample of 25 scores with a mean

a) below 46?

b) below 46 or above 56?

(You will need to use the *z*-table for questions 5 and 6.)

7. What is the difference

between using both tails versus one tail of the sampling distribution in terms

of the region of rejection and the critical value?

8. We obtain xÌ
= 46.8 (with N = 15). This sample may represent the population where Âµ = 50 (o_{x} = 11). Using the .05 criterion and the *lower *tail only of the sampling distribution:

a) what is our critical value?

b) Is the sample in the region of rejection? How do you know?

c) What should be conclude about the sample and why?

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