04 May HOW MANY OBSERVATIONS ARE IN THIS DATA SET (NUMERAL)?
What is the variable for this data set (use words)?
b) How many observations are in this data set (numeral)?
c) How many elements does this data set contain (numeral)?
2. Indicate which of the following variables are quantitative and which are qualitative.
Note: Spell quantitative and qualitative in lower case letters.
a) The amount of time a student spent studying for an exam
b) The amount of rain last year in 30 cities
c) The arrival status of an airline flight (early, on time, late, canceled) at an airport
d) A person’s blood type
e) The amount of gasoline put into a car at a gas station
3. A local gas station collected data from the day’s receipts, recording the gallons of gasoline each customer purchased. The following table lists the frequency distribution of the gallons of gas purchased by all customers on this one day at this gas station.
Gallons of Gas
Number of Customers
4 to less than 8
78
8 to less than 12
49
12 to less than 16
81
16 to less than 20
117
20 to less than 24
13
a) How many customers were served on this day at this gas station?
b) Find the class midpoints. Do all of the classes have the same width? If so, what is this width? If not, what are the different class widths?
c) What percentage of the customers purchased between 4 and 12 gallons? (do not include % sign. Round numerical value to one decimal place)
4. The following data give the one-way commuting times (in minutes) from home to work for a random sample of 50 workers.
23
17
34
26
18
33
46
42
12
37
44
15
22
19
28
32
18
39
40
48
16
11
9
24
18
26
31
7
30
15
18
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