77 Questions
A quantity of interest that can take on different values is known as a(n) _____.
variable
A set of values corresponding to a set of variables is defined as a(n) _____.
observation
The difference in a variable measured over observations (time, customers, items, etc.) is known as _____.
variation
_____ acts as a representative of the population.
A sample
The act of collecting data that are representative of the population data is called _____.
random sampling
The letter grades (A, B, C, D, F) of business analysis students are recorded by a professor. This variable’s classification _____.
is categorical data
The amount of time taken by each of 10 students in a class to complete an exam is an example of what type of data?
Quantitative data
_____ are collected from several entities at the same point in time.
Cross-sectional data
Data collected from several entities over a period of time (minutes, hours, days, etc.) are called _____.
time series data
In a(n) _____, one or more variables are identified and controlled or manipulated so that data can be obtained about how they influence the variable of interest identified first.
experimental study
The data collected from the customers in restaurants about the quality of food is an example of a(n) _____.
observational study
When working with large spreadsheets with many rows of data, it can be helpful to _____the data to better find, view, or manage subsets of data.
sort and filter
When working with data sets in Excel, _____ can be used to automatically highlight cells that meet specified requirements.
conditional formatting
A summary of data that shows the number of observations in each of several nonoverlapping bins is called a(n) _____.
frequency distribution
Which of the following gives the proportion of items in each bin?
Relative frequency
Compute the relative frequencies for the data given in the table below:
Grades | Number of students A 16 B 28 C 33 D 13 Total 90
0.18, 0.31, 0.37, 0.14
Consider the data below. What percentage of students scored grade C?
Grades | Number of students A 16 B 28 C 33 D 13 Total 90
37%
Which of the following are necessary to be determined to define the classes for a frequency distribution with quantitative data?
Number of nonoverlapping bins, width of each bin, and bin limits
The goal regarding using an appropriate number of bins is to show the _____.
variation in the data
A _____ is a graphical summary of data previously summarized in a frequency distribution.
histogram
Identify the shape of the distribution in the figure below.
Skewed right
The _____ shows the number of data items with values less than or equal to the upper class limit of each class.
cumulative frequency distribution
The _____ is a point estimate of the population mean for the variable of interest.
sample mean
Compute the mean of the following data.
56, 42, 37, 29, 45, 51, 30, 25, 34, 57
40.6
Compute the median of the following data.
32, 41, 36, 24, 29, 30, 40, 22, 25, 37
31
Compute the mode for the following data.
12, 16, 19, 10, 12, 11, 21, 12, 21, 10
12
Compute the geometric mean for the following data on growth factors of an investment for 10 years.
1.10, 0.50, 0.70, 1.21, 1.25, 1.12, 1.16, 1.11, 1.13, 1.22
1.0148
The simplest measure of variability is the _____.
range
The variance is based on the
deviation about the mean.
Use technology to compute the standard deviation for the following sample data.
32, 41, 36, 24, 29, 30, 40, 22, 25, 37
6.75
Compute the coefficient of variation for the following sample data.
32, 41, 36, 24, 29, 30, 40, 22, 25, 37
21.36%
Compute the 50th percentile for the following data.
10, 15, 17, 21, 25, 12, 16, 11, 13, 22
15.5
Compute the third quartile for the following data.
10, 15, 17, 21, 25, 12, 16, 11, 13, 22
21.25
Compute the IQR for the following data.
10, 15, 17, 21, 25, 12, 16, 11, 13, 22
9.50
A _____ determines how far a particular value is from the mean relative to the data set’s standard deviation.
z-score
For data having a bell-shaped distribution, approximately _____ percent of the data values will be within one standard deviation of the mean.
68
Any data value with a z-score less than –3 or greater than +3 is considered to be a(n) _____.
outlier
Which of the following graphs provides information on outliers and IQR of a data set?
Box plot
If the covariance between two variables is near 0, it implies that ______.
the variables are not linearly related
The correlation coefficient will always take values _____.
between –1 and +1
Scores on Ms. Bond's test have a mean of 70 and a standard deviation of 11. Michelle has a score of 48. Convert Michelle's score to a z-score. (Round to two decimal places if necessary.)
–2
Scores on Ms. Nash's test have a mean of 64 and a standard deviation of 9. Steve has a score of 52. Convert Steve's score to a z-score. (Round to two decimal places if necessary.)
–1.33
Scores on Ms. Bond's test have a mean of 70 and a standard deviation of 11. David has a score of 52 on Ms. Bond's test. Scores on Ms. Nash's test have a mean of 64 and a standard deviation of 6. Steven has a score of 52 on Ms. Nash's test. Which student has the higher standardized score?
David's standardized score is –1.64 and Steven's standardized score is –2.00. Therefore, Steven has the higher standardized score.
The College Board originally scaled SAT scores so that the scores for each section were approximately normally distributed with a mean of 500 and a standard deviation of 100. Assuming scores follow a bell-shaped distribution, use the empirical rule to find the percentage of students who scored greater than 700.
2.5%
TheCollegeBoardoriginallyscaledSATscoressothatthescoresforeachsectionwereapproximatelynormallydistributedwith a meanof500and a standarddeviationof100.Assuming scores follow a bell-shapeddistribution,usetheempiricalruletofindthepercentageofstudentswhoscoredlessthan400.
16%
The College Board reported that the mean Math Level 2 SAT subject test score was 686 with a standard deviation of 96. Assuming scores followa bell-shapeddistribution, usetheempiricalrule tofindthepercentageofstudentswhoscoredlessthan494.
2.5%
Compute the relative frequency for students who earned an A shown in the table of grades below. Grades | Number of Students A 10 B 31 C 36 D 6 | 83
0.12
Compute the relative frequency for students who earned a C shown in the table of grades below. Grades | Number of Students A 10 B 31 C 36 D 6 | 83
0.43
Below is a histogram for the number of days that it took Wyche Accounting to perform audits in the last quarter of last year. What is the relative frequency of the 21-24 bin?
0.25
Below is a histogram for the number of days that it took Wyche Accounting to perform audits in the last quarter of last year. What is the frequency of the 25-28 bin?
1
What is the total relative frequency? 20XX Contest Sales
Salesman | Frequency | Relative Frequency Frances Clonts 15 0.05 Sarah Leigh 184 0.62 Devon Pride 37 John Townes 62 0.21 Total 298
1
Below is a histogram for the number of days that it took Wyche Accounting to perform audits in the last quarter of last year. What is the bin size for the histogram?
4
Select the histogram that is moderately skewed right.
B
Which graph represents a negative linear relationship between x and y?
C
Below is the data for the number of days that it took Wyche Accounting to perform audits in the last quarter of last year.
56, 42, 37, 29, 45, 51, 30, 25, 34, 57
What is the median number of days that it took Wyche Accounting to perform audits in the last quarter of last year?
39.5
What is the mode of the data set given below?
35, 47, 65, 47, 22
47
A sample of 13 adult males’ heights are listed below.
70, 72, 71, 70, 69, 73, 69, 68, 70, 71, 67, 71, 74
Find the range of the data.
7
James’s manager asked him to sort the last names in the following list in descending order. What does this mean?
The last names must be sorted from Z to A.
You have been asked to reorganize the Excel table below into order of sales using the Sales column. Which option will allow you to do this quickly?
Use the Sort function to organize the data into order of sales.
Which Excel command will return all modes when more than one mode exists?
MODE.MULT
In a survey of patients in a local hospital, 62.42% of the respondents indicated that the health care providers needed to spend more time with each patient. Who makes up the population?
All patients in a local hospital
In a survey of patients in a local hospital, 62.42% of the respondents indicated that the health care providers needed to spend more time with each patient. Who makes up the sample?
All survey respondents
A manager of a fast food restaurant wants the drive-thru employee to ask every fifth customer if he or she is satisfied with the service. Who makes up the population?
All customers who use the drive-thru window of this fast food restaurant
A manager of a fast food restaurant wants the drive-thru employee to ask every fifth customer if he or she is satisfied with the service. Who makes up the sample?
All survey respondents
Which of the following relationships would have a negative correlation coefficient?
Supply and demand
The distribution of hourly sales for a local family owned store is normally distributed with a mean of $225 per hour and a standard deviation of $75 per hour. Which of the following intervals contains the middle 95% of hourly sales?
$75 to $375
Data sets commonly include observations with missing values for one or more variables. In some cases missing data naturally occur; these are called _____.
legitimately missing data
_____ is the process of removing variables from the analysis without losing crucial information.
Dimension reduction
A student willing to participate in a debate competition is required to fill out a registration form. State whether each of the following information about the participant provides categorical or quantitative data.
What is your birth month?
Categorical
A student willing to participate in a debate competition is required to fill out a registration form. State whether each of the following information about the participant provides categorical or quantitative data.
Have you participated in any debate competition previously?
Categorical
A student willing to participate in a debate competition is required to fill out a registration form. State whether each of the following information about the participant provides categorical or quantitative data. how many debate competitions have you participated so far?
Quantitative
A student willing to participate in a debate competition is required to fill out a registration form. State whether each of the following information about the participant provides categorical or quantitative data. Have you won any of the competitions?
Categorical
What is(are) the mode(s) of the following data set?
35, 42, 65, 42, 22
42
You would __________ a table if you wanted to display only data that match specific criteria.
filter
The Excel function STANDARDIZE can be used to calculate ____________.
z-scores
The difference between the largest and the smallest data values is the __________.
range
The ___________ measures the variability of the middle 50% of a data set.
IQR
Test your understanding of key terms and concepts in data analysis with this quiz. Identify the correct terminology related to variables, data collection, and classification.
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