Chapter 1 & 2
When the park ranger at Yellowstone National Park reports the average length of time that visitors spend in the park, he is using: Numerical Measures Graphical Tools Statistical Charts Histograms or Bar Charts
Numerical Measures
What is frequency?
The amount of times something happened in a certain category I.e: Scores: 1,1,2,2,2,2,3,4,4,5,5,5,5,5 Score 1: Frequency 2 Score 2: Frequency 4 Score 3: Frequency 1 Score 4: Frequency 2 Score 5: Frequency 5
Histograms cannot have gaps between the bars, whereas bar charts can have gaps. True or False?
True
If a scatter diagram shows points that are reasonably aligned and are sloping downward from left to right, this implies that there is a negative linear relationship between the two variables. True or False?
True
On a survey, amount of education is recorded as some high school, high school graduate, some college, college graduate, etc. This is an example of ordinal data. True or False?
True
Recording vehicle type as sedan, minivan, pick-up truck, etc. is an example of qualitative data. True or False?
True
Sales data measured each week for the past twenty weeks are examples of time-series data. True or False?
True
Simple random sampling involves selecting members of the population in such as way that all members are equally likely to be chosen. True or False?
True
To show the relationship between amount of rainfall and the number of car accidents, the best type of graph to use is a scatter diagram. True or False?
True
When students are asked to list their age and the percentage of their college expenses that they pay for themselves, the type of data being collected is quantitative. True or False?
True
When using the Histogram tool in Excel to construct a frequency distribution and histogram, the bins represent the upper class limits. True or False?
True
Which of the following is an example of graphs used to describe data? Histograms Bar charts Both A and B are correct None of the above
Both A and B are correct
How do you find the Relative Frequency?
(frequency)/(total)
To show how the price of a stock has changed over the last 3 months, the best type of chart to use is: A histogram A line chart A bar chart A pie chart
A line chart
What is a frequency distribution?
A summary of a set of data that displays the number of observations in each of the distribution's distinct categories or classes
A common rule of thumb for determining how many classes to use when developing a frequency distribution with classes is: Between 5 and 20 classes Equal to 0.25 times the number of data values At least 10 classes No fewer than 6 classes
Between 5 and 20 classes
The use of charts and graphs is an example of: Inferential Statistics Descriptive Statistics Hypothesis Testing Estimation
Descriptive Statistics
A bar chart is most likely used to display which of the following? A continuous variable A nominal level variable An ordinal level variable Either B or C
Either B or C
A cell phone service provider has 14,000 customers. Recently, the sales department selected a random sample of 400 customer accounts and recorded the number of minutes of long distance time used during the previous billing period. The data for this variable is considered to be nominal since the values are based on sample data. True or False?
False
A histogram can be constructed for data that are either quantitative or qualitative. True or False?
False
An open-end question requires respondents to choose from a short list of choices True or False?
False
Cross-sectional data is a set of data values observed at successive points in time. True or False?
False
Data collected on marital status (married, divorced, single, other) would be an ordinal level variable. True or False?
False
Descriptive statistics allow a decision maker to reach a conclusion about a population based on a subset from the population. True or False?
False
In a scatter plot the points should always be connected with a line. True or False?
False
Nominal data is the highest level of data. True or False?
False
Possibly the most frequently used nonstatistical sampling procedure is the simple random sample. True or False?
False
The difference between interval data and ratio data is that interval data has a natural zero. True or False?
False
The sales data for a company measured weekly for the past year would be considered cross-sectional data since the sales values are computed from the entire company. True or False?
False
When a histogram is constructed for discrete numerical data, there should be spaces between the bars of the histogram. True or False?
False
When a marketing manager surveys a few of the customers for the purpose of drawing a conclusion about the entire list of customers, she is applying: Quantitative Models Descriptive Statistics Numerical Measures Inferential Statistics
Inferential Statistics
A histogram is most commonly used to analyze which of the following? Time-Series Data Ordinal Data Quantitative Data Nominal Level Data
Quantitative Data
A light bulb manufacturer wants to advertise the average life of its light bulbs so it tests a subset of light bulbs. This is an example of inferential statistics. True or False?
True
A major insurance company believes that for drivers between 16 years of age and 60 years of age, the number of accidents per year tends to decrease as age increases. If this is the case, a scatter diagram should show a negative relationship between the two variables. True or False?
True
A scatter diagram can show whether a pair of variables has a strong or weak relationship, and also whether it is linear or curved. True or False?
True
A short survey with closed-end questions is likely to have a better response rate than a long survey with open-ended questions. True or False?
True
A variable that has all the properties of an interval variable, but also has a true zero, is a ratio level variable. True or False?
True
A variable, i.e., the length of time it takes for an employee to complete an assembly procedure at an automotive plant, is a ratio level variable. True or False?
True
After developing a frequency distribution for a quantitative variable, a histogram can be developed with the horizontal axis representing the values of the variable and the vertical axis representing the frequency of occurrence in each class or group. True or False?
True
An accountant has recently prepared a report for a client that contains a variety of graphs and charts. In doing so, she has used descriptive statistical methods. True or False?
True
At the end of the school term, students are asked to rate the course and instructor by indicating on a scale of 1-5 how well they liked the course. The data generated from this question are examples of ordinal data. True or False?
True
Bar charts can typically be formed with the bars vertical or horizontal without adversely affecting the interpretation. True or False?
True
Flavors of ice cream (chocolate, vanilla, strawberry, etc.) are an example of nominal data. True or False?
True