Table 3.4 showed data on the percent of the population in a country that
uses cell phones, the variable called “cellular.” LetÂ
y =
cell-phone use andÂ
x = GDP (or Gross Domestic Product – the total value of what is produced in the country).
he SPSS output shows a scatterplot. Describe the plot in terms of (i) the variability of
cell-phone use values for nations close to 0 on GDP, (ii) identifying two nations that have less cell-phone use than you’d expect given their GDP.
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very small variability, the country with the highest GDP and the country with approximate coordinates (28, 35)
very large variability, the country with the highest GDP and the country with approximate coordinates (28, 35)
very small variability, the country with the highest GDP and the country with the second highest GDP
very large variability, the country with the highest GDP and the country with the second highest GDP
my answer is the first one
b.Give the approximateÂ
x– andÂ
y-coordinates for the nation that has highest (i) cell-phone use, (ii) GDP.
(i)
(ii)
c.) Would the correlation be positive, or negative? Explain what it means for the correlation to have this sign.
Positive, as GDP increases,
cell-phone use decreases.
Negative, as GDP increases, cell-phone use decreases.
Positive, as GDP increases,
cell-phone use increases.
Negative, as GDP increases, cell-phone use increases.
d. Suppose you considered the correlation only for those nations having GDP above 15. Would the correlation be stronger, or weaker, than for all 39 nations?
stronger
weaker
the same