Q1) Following data signify the daily average hotel cost and rental car cost for 20 U.S. cities in a week in October 2006.

a) Place data for hotel cost and rental car cost into ordered arrays.

b) Set up stem and leaf displays for each of these data sets.

c) Compare two sets of data. Does ordered array or stem-and-leaf display give more information? Describe in detail.

d) Around what value, if any, are hotel cost and rental car cost concentrated? Describe in detail.

a) Within distribution of scores, measures of dispersion give an indication of:

i) The number of cases which are unsatisfactory

ii) Variety

iii) The size of the sample

iv) The adequacy of the selection criteria for the sample

b) As distribution of scores becomes more variable, value of standard deviation

i) decreases

ii) stays the same

iii) increases

iv) becomes unpredictable

c) A sampling technique which permits you to make sure proportional representativeness in a sample is:

i) Representative sampling

ii) Stratified sampling

iii) Systematic sampling

iv) Simple sampling