MS 150 Statistics Fall 2001 Quiz 03

relationshipsq03.gif (3386 bytes)

For the above six graphs circle the correct word applicable to that graph in each column:

Shape of correlation Amount of correlation If linear, the correlation sign is...
A none | linear | non-linear none | moderate | high not linear | positive | negative
B none | linear | non-linear none | moderate | high not linear | positive | negative
C none | linear | non-linear none | moderate | high not linear | positive | negative
D none | linear | non-linear none | moderate | high not linear | positive | negative
E none | linear | non-linear none | moderate | high not linear | positive | negative
F none | linear | non-linear none | moderate | high not linear | positive | negative

For the following data, determine the slope and intercept of the line that best fits the data:

x y
0 0
20 3
33 6
55 10
  1. Slope = _______________

  2. Y-intercept = _________________

  3. If x = 40, then y = ________________

 

Statistic or Parameter Symbol Equations Excel
Square root =SQRT(number)
Sample size n =COUNT(data)
Minimum =MIN(data)
Maximum =MAX(data)
Median =MEDIAN(data)
Mode =MODE(data)
Sample mean xbar.gif (842 bytes) Sx/n =AVERAGE(data)
Population mean m SX/N
x P(x)
n p (binomial)
=AVERAGE(data)
Sample standard deviation s
sx
sxn-1
sampstdev.gif (1072 bytes) =STDEV(data)
Population standard deviation s
s
x
sxn
probabilitypopstdev.gif (1053 bytes)
npq.gif (927 bytes) (binomial)
=STDEVP(data)
Sample variance (sx) =VAR(data)
Population variance s =VARP(data)
Sample Coefficient of Variation CV 100(sx/xbar.gif (842 bytes)) =100*STDEV(data)/AVERAGE(data)
Slope b =SLOPE(y data, x data)
Intercept a =INTERCEPT(y data, x data)
Correlation r =CORREL(y data, x data)
Coefficient of Determination r =(CORREL(y data, x data))^2

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