STAT 200 FINAL EXAMINATION, SPRING 2017 STAT 200 FINAL EXAMINATION, | Page 2

(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
3. ​ The frequency distribution below shows the distribution for IQ scores for a random sample of
1000 adults. (​ Show all work. Just the answer, without supporting work, will receive no credit.)
(a) Complete the frequency table with frequency and cumulative relative frequency. Express the
cumulative relative frequency to three decimal places.
(b) What percentage of the adults in this sample has an IQ score between 90 and 129,
inclusive?