stats exam 1
For the past week, a company's common stock closed with the following prices: $61.5, $62, $61.25, $60.875, and $61.5. What was the price range?
$1.125
Here is a sample distribution of hourly earnings in Paul's Cookie Factory. Hourly Earning$6 up to $9$9 up to $12$12 up to $15Frequency164210 The limits of the class with the smallest frequency are
$12.00 and up to $15.00.
The following are the weekly amounts of welfare payments made by the federal government to a sample of six families: $139, $136, $130, $136, $147, and $136. What is the range?
$17
The net incomes (in $millions) of a sample of steel fabricators are $86, $67, $86, and $85. What is the modal net income?
$86
Percentiles divide a distribution into _____________.
100 equal parts
A sample of single persons receiving Social Security payments revealed these monthly benefits: $826, $699, $1,087, $880, $839, and $965. How many observations are below the median?
3
Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: Days AbsentNumber of Employees0 up to 3603 up to 6316 up to 9149 up to 12612 up to 152 How many employees were absent for 3 up to 6 days?
31
Quartiles divide a distribution into ___________.
4 equal parts
Refer to the following frequency distribution of days absent during a calendar year by employees of a manufacturing company: Days AbsentNumber of Employees0 up to 3143 up to 6496 up to 9589 up to 122812 up to 156 How many employees were absent for 3 up to 6 days?
49
Refer to the following breakdown of responses to a survey of "Are you concerned about being tracked while connected to the Internet?" ResponseFrequencyVery concerned140Somewhat concerned40No concern20 What type of chart should be used to show relative class frequencies?
A pie chart
When data are collected using a qualitative, nominal variable, what is true about a frequency table that summarizes the data?
A pie chart can be used to summarize the data.
A student was interested in the cigarette-smoking habits of college students and collected data from an unbiased random sample of students. The data are summarized in the following table. What type of chart would best represent the data from this frequency table?
Bar chart
The performance of personal and business investments is measured as a percentage called "return on investment." What type of variable is "return on investment"?
Continuous
The sum of the deviations of each data value from this measure of central location will always be zero.
Mean
For any data set, which measures of central location have only one value?
Mean and median
Which of the following is true?
No matter what your career, you need a knowledge of statistics to understand the world.
Respondents were asked "Do you now earn more than or less than you did five years ago?" what is this level of measurement?
Nominal
Shoe style is an example of what level of measurement?
Nominal
The Equal Employment Opportunity Act requires employers to classify their employees by gender and national origin. Which level of measurement is this?
Nominal
Which of the following is NOT an example of discrete data?
Number of miles between New York City and Chicago.
A bank asks customers to evaluate its drive through service as good, average, or poor. Which level of measurement is this classification?
Ordinal
A small sample of computer operators shows monthly incomes of $1,950, $1,775, $2,060, $1,840, $1,795, $1,890, $1,925, and $1,810. What are these ungrouped numbers called?
Raw data
The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called?
Statistics
When TV advertisements report that "2 out of 3" dentists surveyed indicated they would recommend Brand X toothpaste to their patients," an informed consumer may question the conclusion because?
The advertisement does not include the total number of dentists surveyed.
Which of the following is true about the correlation coefficient based on the graph below of variables X and Y?
The correlation coefficient will be close to zero.
Which of the following statements about histograms are true?
The heights of the bars represent class frequencies.
Which of the following is an example of a qualitative variable?
The industry category that a company is in
For a data set with an odd number of observations that have been sorted from smallest to largest values, where is the median located?
The observation in the middle
What is the relationship among the mean, median, and mode in a symmetric distribution?
They are all equal.
When data are collected using a quantitative, ratio variable, what is true about a frequency distribution that summarizes the data?
Upper and lower class limits must be calculated.
A dot plot is best applied when _____________________.
a single variable is summarized
A contingency table would be used to summarize data such as ________.
company employees by gender and organizational title
The Inclusive Method
determines different locations for the first and third quartiles than the Exclusive Method.
In a frequency distribution, the number of observations in a class is called the class
frequency.
Consider two populations with the same mean. Since they have the same mean, then
none of these are correct.
The following graph is a ___________.
scatter diagram
To locate the percentile for a given observation in a data set, the data must be ___________.
sorted and listed from the minimum to the maximum values
f the variance of the "number of daily parking tickets" issued is 100, the standard deviation is defined as the _______.
square root of the variance of the "number of daily parking tickets"
A dot plot shows ____________.
the general shape of a distribution
The 67th percentile is _______
the value below which 67% of the observations occur
