MS1023 3.1.4 Practice
Which of the following symbols represents the mean of the sample?
/x
The ages of students in a class have been put into the frequency distribution below. Age Number of Students 18 3 19 5 20 28 21 4 What is the average age of these students?
19.83
The ages of students in a class have been put into the frequency distribution below. Age Number of Students 18 3 19 5 20 28 21 4 What is the median age of these students?
20
The ages of students in a class have been put into the frequency distribution below. Age Number of Students 18 3 19 5 20 28 21 4 What is the mode age of these students?
20
A group of students had dinner at a local restaurant. The total bill for the dinner was $414.70. Each student paid his/her equal share of the bill, which was $18.85. How many student's were at the dinner?
22
A commuter travels many miles to work each morning. She has timed this trip 5 times during the last month. The time (in minutes) required to make this trip was 34, 39, 41, 35, and 41. The mean time (in minutes) required for this trip was _______.
38
A commuter travels many miles to work each morning. She has timed this trip 5 times during the last month. The time (in minutes) required to make this trip was 34, 39, 41, 35, and 41. The mode time required for this trip was _______.
41
The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway. Speed Frequency 50-54 2 55-59 4 60-64 5 65-69 10 70-74 9 75-79 5 =35 The mean is
67
The closing stock price of MNM Corporation for the last 7 trading days is shown below. Day Stock Price 1 84 2 87 3 84 4 88 5 85 6 90 7 91 The mode is
84
A statistics student made the following grades on 7 tests: 76, 82, 92, 95, 79, 86, and 92. What is the mean grade?
86
A statistics student made the following grades on 7 tests: 76, 82, 92, 95, 79, 86, and 92. What is the median grade?
86
The middle value in an ordered array of numbers is called the mode.
False
Which of the following provides a measure of central location for the data?
Mean
Which of the following symbols represents the size of the population?
N
When should measures of location and dispersion be computed from grouped data rather than from individual data values?
Only when individual data values are unavailable
For grouped data, the midpoint of each class interval is used to represent all the values in a class interval.
True
It is inappropriate to use the mean to analyze data that are not at least interval level in measurement.
True
The most frequently occurring value in a set of data is called the mode.
True
Which of the following is not a measure of central location?
Variance
The mean of the sample
can assume any value between the highest and the lowest value in the sample.
From a population of size 500, a random sample of 50 items is selected. The mode of the sample
can be larger, smaller or equal to the mode of the population.
The median is a measure of
central location.
In computing descriptive statistics from grouped data,
data values are treated as if they occur at the midpoint of a class.
The mean of a sample
is computed by summing all the data values and dividing the sum by the number of items.
If a data set has an even number of observations, the median
is the average value of the two middle items when all items are arranged in ascending order.
The first quartile
is the same as the 25th percentile.
The measure of location which is the most likely to be influenced by extreme values in the data set is the
mean.
The most frequently occurring value of a data set is called the
mode.
In computing the mean of a sample, the value of ∑ xi is divided by
n
Which of the following symbols represents the size of the sample?
n
If two groups of numbers have the same mean, then
other measures of location need not be the same.
The pth percentile is a value such that approximately
p percent of the observations are less than the value and (100 - p) percent are more than this value.
The 75th percentile is referred to as the
third quartile.
A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a
weighted mean
From a population of size 1,000, a random sample of 100 items is selected. The mean of the sample
can be larger, smaller or equal to the mean of the population.
The most frequently occurring value of a data set is called the
mode.