Practice Exam 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

What is the correlation coefficient?

0.938

Consider a sample on the waiting times (in minutes) at the billing counter in a grocery store to be 15, 24, 18, 15, 21, 20, 15, 22, 19, 16, 15, 22, 20, 15, and 21. Compute the mean, median, and mode.

18.53 and 19 and 15

Compute the coefficient of variation for the following sample data. 32, 41, 36, 24, 29, 30, 40, 22, 25, 37

21.36%

What is the mode of the data set given below? ​ 35, 47, 65, 47, 22 ​

47

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

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

Natalie needs to compare the number of employees by job title for the last five years. Which of the following charts should Natalie use? ​

Clustered column chart

__________ are collected from several entities at the same point in time.

Cross-sectional 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

__________ refers to the technology that allows data, collected from sensors in all types of machines, to be sent over the Internet to repositories where it can be stored and analyzed.

Internet of Things

The letter grades (A, B, C, D, F) of business analysis students are recorded by a professor. This variable's classification

Is categorical data

A decision concerned with how the organization is run from day to day is known as a(n) _______________.

Operation

A mathematical model that gives the best decision, subject to the situation's constraints, is an a(n)

Optimization

_________ analytics are techniques that use models, constructed from past data, to predict the future or to ascertain the impact of one variable on another.

Predictive

__________ analytics use techniques that take input data and yield a best course of action.

Prescriptive

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 used in the pharmaceutical industry to assess the risk of introducing a new drug.

Simulations

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

The scores of a sample of students in a Math test are 20, 15, 19, 21, 22, 12, 17, 14, 24, 16 and in a Stat test are 16, 12, 19, 17, 22, 14, 20, 21, 24, 15, 13. a. Compute the mean and median scores for both the Math and the Stat tests.b. Compare the mean and median scores computed in part a. Which answer is true?

The mean and median scores for statistics are lower than that for mathematics

What is your interpretation of the relationship between income and savings?

There is a positive relationship

A better understanding of consumer behavior through analytics directly leads to

better pricing strategies

Optimization models can be used to

decide on how to invest cash received from insurance policies.

In order to manage an organization's human resource activities, such as hiring employees, tracking, and influencing employee retention, HR personnel use

descriptive and predictive analytics.

Bar charts use

horizontal bars to display the magnitude of the quantitative variable

Data-ink is the ink used in a table or chart that

is necessary to convey the meaning of the data to the audience.

In a business, the values indicating the business's current operating characteristics, such as its financial position, the inventory on hand, and customer service metrics, are typically known as

key performance indicators

A __________ is used for examining data with more than two variables, and it includes a different vertical axis for each variable.

parallel-coordinates plot

Making visual comparisons between categorical variables may be difficult in a

pie chart

A useful chart for displaying multiple variables is the

scatter chart matrix

A data __________ is trained in both computer science and statistics and knows how to effectively process and analyze large amounts of data.

scientist

To avoid problems in interpreting the differences in color in a heat map, ____________ can be added.

sparklines

Data collected from several entities over a period of time (minutes, hours, days, etc.) are called

time series data

A __________ is useful for visualizing hierarchical data along multiple dimensions.

treemap

A _____________ is a line that provides an approximation of the relationship between the variables.

trendline