The nonprofit group public agenda conducted telephone interviews with a stratified sample of parents of high school children. there were 202 black parents, 202 hispanic parents, and 201 white parents. one question asked was are the high schools in your state doing an excellent, good, fair or poor job, or don't you know enough to say? here are the survey results:

Explanation:

According to the attached diagram showing distribution of parents’ opinion in each group of parents?

Plan: Chi-Squared Test for Homogeneity of Populations ,

² = ∑(−)² / p

let α = .05 and

₀:ℎ ℎ ℎ

ₐ:ℎ ℎ ℎ s

Show: All participants were selected randomly and we’ll assume there are more than 6050 parents. All expected counts

are greater than or equal to 5.

Do: ² = 22.42 p-value = .004 with df= 8

Interpret: Because the p-value = .004 < = .05, reject 0. Evidence suggests the distributions of opinion are not the

same in each group of parents

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)

they could find out our specific needs.