Concept explainers
(a)
Height of the density curve.
(a)

Answer to Problem 43E
Height of the density curve is 0.25.
Explanation of Solution
Given information:
The distribution has been modeled according to uniform distribution on the interval
Such that
And
Calculations:
With uniform distribution, the density curve is reciprocal to the difference of the boundaries.
On the interval between the boundaries,
With
Thus, the height of the density curve is 0.25.
(b)
Percentage of time that the light flashes more than 3.75 seconds after the subject clicks “Start”.
(b)

Answer to Problem 43E
31.75% of the time that the light flashes more than 3.75 seconds.
Explanation of Solution
Given information:
Time until light flashes,
Calculations:
The area underneath the density curve between
Note that
Area underneath the density curve will be the rectangle.
With
Width,
And
Height,
Then
Therefore,
31.25% of the time that the light flashes more than 3.75 seconds after the subject clicks “Start”.
(c)
38th percentile of the distribution to be calculated and interpreted.
(c)

Answer to Problem 43E
38th percentile of the distribution is 2.52 seconds.
Explanation of Solution
Given information:
The distribution has been modeled according to uniform distribution on the interval
Such that
And
Calculations:
According to the property for the 38th percentile, 38% of the data values should be smaller than the 38th percentile.
Let
xbe the 38th percentile.
The area underneath the density curve between 1 and x , will be the probability that the time is between the lower boundary and x .
Note that
Area underneath the density curve will be the rectangle.
With
Width,
And
Height,
Then
We know that
xis the 70th percentile.
Then
The probability has to be equal to 38% or 0.38.
Add 0.25 to both sides.
Divide the above equation by 0.1.
That becomes
Therefore,
The 38thpercentile of the distribution will be 2.52 seconds, which means that for 38% of the time, the subjects have to click the button in less than 2.52 seconds.
Chapter 2 Solutions
EBK PRACTICE OF STAT.F/AP EXAM,UPDATED
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