ECO 391 EXAM 1 questions and
answers graded A+
Suppose the data have a bell-shaped distribution with a mean 35 of and a standard deviation of
7. Use the empirical rule to determine the percentage of data within of the following range: 21
to 49 - correct answer ✔✔approx. 95%
Suppose the data have a bell-shaped distribution with a mean 35 of and a standard deviation of
7. Use the empirical rule to determine the percentage of data within of the following range: 14
to 56 - correct answer ✔✔almost all
Suppose the data have a bell-shaped distribution with a mean 35 of and a standard deviation of
7. Use the empirical rule to determine the percentage of data within of the following range: -
correct answer ✔✔approx. 68%
Generally, which of the following is the least appropriate measure of central tendency for a data
set that contains outliers? - correct answer ✔✔mean
An important measure of location for categorical data is the _____. - correct answer ✔✔mode
A numerical measure, such as a mean, computed from a population is known as a _____ -
correct answer ✔✔population parameter
The mean of a sample is _____. - correct answer ✔✔computed by summing all the data values
and dividing the sum by the number of items
The variance of a sample or a population cannot be _____ - correct answer ✔✔negative
, The measure of central location most often reported for annual income and property value data
is the _____ - correct answer ✔✔median
A numerical measure computed from a sample, such as sample mean, is known as a _____. -
correct answer ✔✔sample statistic
Which of the following is NOT a measure of location? - correct answer ✔✔variance
The sample variance _____. - correct answer ✔✔could be smaller, equal to, or larger than the
true value of the population variance
Which of the following symbols represents the size of a population? - correct answer ✔✔N
In 2000, the average hours of television watched weekly in a household was 5 with a standard
deviation of 1.43. In 2002, average hours of television watched weekly in a household was 8
with a standard deviation of 3.12. Which of the following statements is correct? - correct
answer ✔✔The number of hours is more variable in the year 2002.
The variance of a sample of 81 observations is 64. The standard deviation of the sample is which
of the following? - correct answer ✔✔8
The measure of variability easiest to compute, but seldom used as the only measure, is the
_____ - correct answer ✔✔range
The level of significance in hypothesis testing is the probability of _____. - correct answer
✔✔rejecting a true null hypothesis
In the past, 75% of the tourists who visited Chattanooga went to see Rock City. The
management of Rock City recently undertook an extensive promotional campaign. They are
interested in determining whether the promotional campaign actually INCREASED the
answers graded A+
Suppose the data have a bell-shaped distribution with a mean 35 of and a standard deviation of
7. Use the empirical rule to determine the percentage of data within of the following range: 21
to 49 - correct answer ✔✔approx. 95%
Suppose the data have a bell-shaped distribution with a mean 35 of and a standard deviation of
7. Use the empirical rule to determine the percentage of data within of the following range: 14
to 56 - correct answer ✔✔almost all
Suppose the data have a bell-shaped distribution with a mean 35 of and a standard deviation of
7. Use the empirical rule to determine the percentage of data within of the following range: -
correct answer ✔✔approx. 68%
Generally, which of the following is the least appropriate measure of central tendency for a data
set that contains outliers? - correct answer ✔✔mean
An important measure of location for categorical data is the _____. - correct answer ✔✔mode
A numerical measure, such as a mean, computed from a population is known as a _____ -
correct answer ✔✔population parameter
The mean of a sample is _____. - correct answer ✔✔computed by summing all the data values
and dividing the sum by the number of items
The variance of a sample or a population cannot be _____ - correct answer ✔✔negative
, The measure of central location most often reported for annual income and property value data
is the _____ - correct answer ✔✔median
A numerical measure computed from a sample, such as sample mean, is known as a _____. -
correct answer ✔✔sample statistic
Which of the following is NOT a measure of location? - correct answer ✔✔variance
The sample variance _____. - correct answer ✔✔could be smaller, equal to, or larger than the
true value of the population variance
Which of the following symbols represents the size of a population? - correct answer ✔✔N
In 2000, the average hours of television watched weekly in a household was 5 with a standard
deviation of 1.43. In 2002, average hours of television watched weekly in a household was 8
with a standard deviation of 3.12. Which of the following statements is correct? - correct
answer ✔✔The number of hours is more variable in the year 2002.
The variance of a sample of 81 observations is 64. The standard deviation of the sample is which
of the following? - correct answer ✔✔8
The measure of variability easiest to compute, but seldom used as the only measure, is the
_____ - correct answer ✔✔range
The level of significance in hypothesis testing is the probability of _____. - correct answer
✔✔rejecting a true null hypothesis
In the past, 75% of the tourists who visited Chattanooga went to see Rock City. The
management of Rock City recently undertook an extensive promotional campaign. They are
interested in determining whether the promotional campaign actually INCREASED the
