Pearson eText Business Statistics: First Course -- Instant Access (Pearson+)
8th Edition
ISBN: 9780136880974
Author: David Levine, David Stephan
Publisher: PEARSON+
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A particularly virulent form of human-adapted mad cow disease sweeps across the world transforming most of the world into ravenous zombies. The zombie population obeys the law of uninhibited growth. A small group of survivors find an uninfected haven. On the first day in the safe haven, 15 people ate contaminated hamburger and turned into zombies. Ten days later, there are 300 zombies. What is the size of the zombie population after 16 days? Use A(t)=A0e^kt, where t represents the number of days that have passed since the first zombies appeared. Show your work.
A team of UMD students have invented an inhalable drug that
they think will help people breathe better during hard exercise.
They test the drug on 3 volunteers (A, B, and C) by measuring
their levels of arterial oxygen before receiving the drug (their
base level) and then after 5 and 10 minutes have elapsed,
respectively. The results are listed in the table.
Oxygen level [mmHg] A B C
base level
847076
after 5 minutes
85 74 81
after 10 minutes
90 75 98
We want to see how the drug work (better or worse) when
compared to the base level. Compute the 90% two-sided
confidence intervals for the mean difference between the base
level and after 5 minutes.
X1b
Xub
X 1b
-5.1783
Xub
11.8450
Compute the 90% two-sided confidence intervals for the mean
difference between the base level and after 10 minutes.
-1.94
? Xx 0%
23.94
? × 0%
? × 0%
X 0%
The "cold start ignition time" of an automobile engine is being investigated by a gasoline manufacturer. Two
gasoline formulations were made and the following times, in seconds, were obtained for the same test
vehicle.
Formulation 1: 1.75
1.92
2.62
2.35
3.09
3.15
2.53
3.40
1.91
Formulation 2: 1.83
1.99
3.13
3.29
2.65
2.87
2.46
1.89
3.35
a. Calculate the mean for each formulation.
b. Which of the two formulations has a more varied set of data? What is your statistical basis for this?
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