STATISTICS AND PROBABILITY REVIEWER

     How many different samples of size n = 2 can be drawn from the population?

•        6              

• 5 

• 4  

• 3

   Which of the following sample mean appears most frequent in the sampling distribution?

• 10

• 11.5

• 12

• 12.5

     What is the lowest value of the sample mean in this sampling distribution?

• 11.5

• 12

• 12.5

• 13

What is the frequency of the sample mean 12.5?

• 0

• 1

• 2

• 3

A population consists of 1, 9, 2, 12, 8, 7, and 10. Suppose samples of size 5 are drawn from this population. This situation is an example of the sampling distribution of the sample mean for a normal population wherein population variance is            

• unknown

• known

• large

• small

Suppose the manager of a Jollibee Corp. wishes to know whether their chicken packaging machine still packs accurately after 6 months of use. The machine was rated to pack 1,500-gram pack of chicken with a standard deviation of 30 grams. The statistician tests a sample of 40 packs to test the accuracy of the machine. What example of sampling distribution of the sample mean for normal population portrays the situation?

• variance is known

• variance is unknown

• standard deviation is small

•   standard deviation is large

  Which of the following is NOT a distinguishing feature of simple random sampling?

•    Each element in the population has an equal probability of being selected

•   Random numbers selected to decide which elements are included as the sample.  

• Each element has a unique identification.

•   Samples are selected based on the subjective judgment of the researcher.

      Which of the following is NOT a type of random sampling method?

• cluster

• convenience

• simple

• systematic

     A researcher was given a random list of all graduating senior high school students. He decided to conduct a survey by asking every seventh student on the list regarding the courses that they want to take in college. What type of sampling technique he is planning to use?

• cluster

• random

• stratified

• systematic

    What do you call to the set of all people, objects, events, or ideas researchers want to investigate?

• data

• population

• sample

• statistics