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A pharmaceutical company wants to know whether an
Chapter 1, Problem 35SE(choose chapter or problem)
A pharmaceutical company wants to know whether an experimental drug has an effect on
systolic blood pressure. Fifteen randomly selected subjects were given the drug and, after
sufficient time for the drug to have an impact, their systolic blood pressures were recorded.
The data appear below:
172 |
140 |
123 |
130 |
115 |
148 |
108 |
129 |
137 |
161 |
123 |
152 |
133 |
128 |
142 |
a Approximate the value of s using the range approximation.
b Calculate the values of \(\bar{y}\) and s for the 15 blood pressure readings.
c Use Tchebysheff’s theorem (Exercise 1.32) to find values a and b such that at least 75%
of the blood pressure measurements lie between a and b.
d Did Tchebysheff’s theorem work? That is, use the data to find the actual percent of blood
pressure readings that are between the values a and b you found in part (c). Is this actual
percentage greater than 75%?
Equation Transcription:
Text Transcription:
y bar
Questions & Answers
QUESTION:
A pharmaceutical company wants to know whether an experimental drug has an effect on
systolic blood pressure. Fifteen randomly selected subjects were given the drug and, after
sufficient time for the drug to have an impact, their systolic blood pressures were recorded.
The data appear below:
172 |
140 |
123 |
130 |
115 |
148 |
108 |
129 |
137 |
161 |
123 |
152 |
133 |
128 |
142 |
a Approximate the value of s using the range approximation.
b Calculate the values of \(\bar{y}\) and s for the 15 blood pressure readings.
c Use Tchebysheff’s theorem (Exercise 1.32) to find values a and b such that at least 75%
of the blood pressure measurements lie between a and b.
d Did Tchebysheff’s theorem work? That is, use the data to find the actual percent of blood
pressure readings that are between the values a and b you found in part (c). Is this actual
percentage greater than 75%?
Equation Transcription:
Text Transcription:
y bar
ANSWER: