Choose the best answer. Justify for full credit. (a) A study was conducted at a
ID: 3232573 • Letter: C
Question
Choose the best answer. Justify for full credit.
(a) A study was conducted at a local college to analyze the average GPA of students graduated from UMUC in 2016. 100 students graduated from UMUC in 2016 were randomly selected, and the average GPA for the group is 3.5. The value 3.5 is a
(i) statistic
(ii) parameter
(iii) cannot be determined
(b) The hotel ratings are usually on a scale from 0 star to 5 stars. The level of this measurement is
(i) interval
(ii) nominal
(iii) ordinal
(iv) ratio
(c) The quality control department of a semiconductor manufacturing company tests every 100th product from the assembly line. This type of sampling is called:
(i) cluster
(ii) convenience
(iii) systematic
(iv) stratified
Explanation / Answer
a. When it is a group' average its a sample average. For a sample its a statistic. For a population its a parameter
Answer is (i)statistic
b.Its ordinal range. ranks and ordinal are just the same.
c. Systematic sampling is a type of probability sampling method in which sample members from a larger population are selected according to a random starting point and a fixed periodic interval. This interval, called the sampling interval, is calculated by dividing the population size by the desired sample size.
So, here is we are systematically picking in interval of 100 people. and hence answer is iii)systematic