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QUESTION 2
Qualitative
adule
Part H
A common convention in social science is to set the alpha level at .05 and to reject the null hypothesis if the observed significance level is less
than the alpha level, p <.05. Which of the following is correct?
a. Ifp=,041, reject the null hypothesis
ob. if p = .074, reject the null hypothesis
oc. If p-.000, do not reject the null hypothesis
od if p = 952, reject the null hypothesis
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QUESTION 3
5
LEARNING
5
RNING
S
LEARNING
S
ERS
SCUSSION
Part H
A confidence interval is a range of population values estimated from the results of a sample. From a random sample of 100 graduate students at
Walden, suppose you calculate the average age to be 37 plus or minus 11, which would make the lower limit of the confidence interval 26 lie. 37
- 11 = 26) and the upper limit 48 (i. e., 37 + 11 = 48). If this was a 95% confidence interval, which of the following is correct?
O a. There is a 5% probability that the true average age of Walden graduate students is between 26 and 48
b.95% of all Walden graduate students are between 26 and 48 years of age
OC. The true average age of Walden graduate students could be less than 26 or greater than 48
od. A 99% confidence interval would be narrower, for example between 32 and 42
CATION &
SS
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the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)