Reference no: EM1320589

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

City	Hotel	Cars
S. Francisco	205	47
LA	179	41
Seattle	185	49
Phoenix	210	38
Denver	128	32
Dallas	145	48
Houston	177	49
Minn.	117	41
Chicago	221	56
St. Louis	159	41
New Orleans	205	50
Detroit	128	32
Cleveland	165	34
Atlanta	180	46
Orlando	198	41
Miami	158	41
Pittsburg	132	39
Boston	283	67
New York	269	69
Wash. D.C.	204	40

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