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Bsad Ch 1

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Submitted By batmandevil
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CH 1: Supplementary exercises 2, 3, 7, 8, 13, 14, 19, 20, 25 (pgs 25-32).

2.

a. There are 10 elements in this data set.

b. There are 5 variables in this data set.

c. Categorical Variables = Operating system and CPU manufacturer
Quantitative variables = Cost ($), Display size (inches) and Battery life (hours).

d.
Variable Type of measurement
Operating system Nominal
CPU Manufacturer Nominal
Cost Interval Scale
Display Interval Scale
Battery Interval Scale

3.
a. Average cost = (599+299+499+860+668+899+530+590+525+360) / 10 = 5829/10 = $ 582.9

b. Average cost of tablets with windows operating system, = (599+860+668+899+590)/5
= 3616/5
=$723.20

Average cost of tablets with Android operating system,
= (299+530+525+360) /4
= $428.50

So, the cost of a tablet with windows is about 1.7 times more expensive than an Android.

c. Percentage of tablets using CPU manufactured by TI OMAP = (2/10)*100 = 20%

d. Percentage of tablets using Android operating system = (4/10)*100 = 40%

7.
a. The data collected by Kroger in this example are Categorical.

b. Nominal measurement scale has been used.

8.
a. The sample size for this poll is 762.

b. The data are categorical.

c. It make more sense to use percentage in this kind of survey.

d. Number of individual saying Yes = 67% of 762 = 511

13.
a. The variable of interest is federal spending.

b. The data are quantitative.

c. The data are time series.

d. The federal spending increases between 2004-2009 and after this period between 2009 and 2012, the result are almost stable or decreasing and increasing a little bit but nothing really relevant.

14.

a.

b.

The graph above shows that the Hertz with large number of services and Dollar with least in 2007. But in 2009 Avis slightly exceeds the number of services than that of

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