U.S. History 1301
Week 1, Essay 1
Cortez Reading Essay 1
Hernando Cortez, who commanded the arrival of the expedition in Mexico, was a great
leader. He was described as a handsome, strong, skilled at arms, courageous, daring, and had a
Christopher Columbus vs. De Las Casas
Christopher Columbus vs. De Las Casas
Christopher Columbus sailed to the New World (The Americas, the west) to the islands of
Turks and Caicos, which the Indians called Gunaham but he rename
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A condence interval is constructed by using the point estimate as a base, to which we add and
, Ito-d about thla
Your answer IS correct. a
A 95% condence Interval for the population mean lmplle
An article in the National Geographic News (U.S. Racking Up Huge Sleep Debt, February
24, 2005) argues that Americans are increasingly skimping on their sleep. A researcher in a
small Midwestern town wants to estimate the mean weekday sleep time of its ad
A recent study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (The
Wall Street Journal, May 5, 2010). Suppose a random sample of 100 teen drivers is taken. Use Table 1.
Calculate the standard error for the sam
A confidence interval provides a value that, with a certain measure of confidence, is the population parameter of
For a given confidence level !
and population standard deviation !
confidence interval for the population mean is wider, the smal
True or false: If we had access to data that included the entire population, then the values of the
parameters would be known and no statistical inference would be required.
V _ I; Rood about this
Your answer IS correct.
If you have data that describes th
Selection bias occurs when the sample is mistakenly divided into strata, and random samples are drawn
from each stratum.
A simple random sample is a sample of n observations that has the same probability of being selected
from the population as any othe
The union of two events A and B, denoted by !
, does not have outcomes from both A and B.
For an experiment in which a single die is rolled, the sample space may be cfw_1, 1, 2, 3, 4, 5.
The complement of an event A, denoted by AC, within the sample s
A random variable X follows the uniform distribution with a lower limit of 750 and an upper limit of
Calculate the mean and the standard deviation of this distribution. (Round intermediate
calculation for standard deviation to 4 decimal places a
A continuous random variable is characterized by uncountable values and can
take on any value within an interval.
We are often interested in finding the probability that a continuous random
variable assumes a particular value.
The probability density
True or false:
A discrete random variable can assume an uncountable number of values.
V Your answer Is correct. [a
A discrete random variable assumes a countable number of values
For a continuous random variable X, the cumulative d
The random variable video was interesting as it highlighted the space program which has since
been retired as of 2011 in the United States. The destruction of the Challenger and its cause was
alarming when it came to the calculations whic
This video was interesting because I have always wanted to know how battery companies would
come up with their claims their product will last a certain amount of time. The battery companies
claims were more and more specific to the de
The Sampling Distributions video used a classroom of children to show how the height of the
class on a chart using population distribution. We will create a smaller sample size to determine
all sample means and create a sampling of
Pardis Sabeti started this particular video with the word normal referring to standard deviations
from the mean with the 68-95-99.7 Rule. The standard deviation is a natural yardstick for any
measurements that follow a normal distribut
1. India is the second most populous country in the world, with a population of over 1 billion people. Although
the government has offered various incentives for population control, some argue that the birth rate,
especially in rural India, is still too
A random variable is a function that assigns numerical values to the outcomes of a random
A discrete random variable X may assume an (infinitely) uncountable number of distinct values.
A continuous random variable X assumes an (infinitely)
A function that asslgns numerlcal values to the outcomes of a random experiment Is called a
V Your answer Is correct. *
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A discrete variable cannot assume an infinite number of values.
Typically, it is possible to examine every member of the population.
Both discrete and continuous variables may assume an uncountable number of values.
A continuous variable assumes any
1.) Determine whether the following probabilities are best categorized as subjective,
empirical, or classical probabilities.
a. Before flipping a fair coin, Sunil assesses that he has a 50% chance of obtaining
b. At the beginn
For an experiment in which a single die is rolled, the sample space may be
cfw_1, 1, 2, 3, 4, 5.
The probability of a union of events can be greater than 1.
Events are exhaustive if they do not share common outcomes of a sample
1. The following table shows the 10 highest-paid chief executive officers of the last decade.
a. Calculate the mean compensation for the 10 highest-paid chief executive officers.(Enter your answer
in millions rounded to 2 decimal places.)
1. It came as a big surprise when Apples touch screen iPhone 4, considered by many to be the best
smartphone ever, was found to have a problem (The New York Times, June 24, 2010). Users complained
of weak reception, and sometimes even dropped calls, when
1. What is the perfect summer trip? A National Geographic Kids survey (AAA Horizons, April
2007) asked this question to 316 children ages 8 to 14. Their responses are given in the following
a-1. Construct a relative frequency distr
A frequency distribution for qualitative data groups these data into classes
called intervals and records the total number of observations in each class.
The relative frequency of a category is calculated by dividing the category's
frequency by the tota
A knowledge of statistics provides the necessary tools to differentiate
between sound and questionable conclusions.
Statistics is the methodology of extracting unnecessary information from a
The branch of statistical studies called descripti
The terms central location or central tendency refer to the way quantitative
data tend to cluster around some middle or central value.
The mean is the middle value of a data set.
The weighted mean is relevant when some observations contribute more
LawnCo is a lawn service company which provides grounds and maintenance services to a
range of corporate customers. Customers are expected to pay on the first of each month, in
advance of receiving services. One of LawnCos corporate customers is an