Chapter 1-5 practice test

Which chart shows distribution shape?

Which probability distribution is often used to model the number of occurrences over an interval (time, area, etc.)?

A study changing one factor is experimental.

A z-score tells you _____.

A set of bi-variate data shows that as x increases, y decreases. The scatter plot likely shows a _____.

Gathering census information is observational data.

For a normally distributed variable with a mean of 500 units and a sd of 50 units. What is the z-score of 575?

Best visualization for a single numeric variable?

Which of the following is an example of time series data?

If P(A) = 0.7, then the probability of the complement of A, P(A'), is _____.

A researcher alters caffeine levels in sodas.

Which decision type is primarily focused on the organization’s long-term direction and overarching objectives?

A marketing team notices a spike in website visits after a promotional email. This observation about the past is

If you flip a fair coin twice, the probability of getting exactly two heads is _____?

Which type of decision focuses on immediate execution and routine tasks within an organization?

To represent the correlation between two quantitative variables visually, the best choice is typically a(n) _____

Approximately what percentage of values lie within 1 standard deviation of the mean in a bell-shaped distribution?

What type of analytics recommends actions?

Operational decisions focus on routine tasks

Final letter grades are an example of _____.

A store has normally distributed sales with a mean of $1500 and sd of $500. What percent of sells are less than $3000?

What is the mode of the following data: 8, 10, 6, 4, 10, 7, 5, 9, 3, 10

A prescriptive model uses optimization algorithms.

Prescriptive analytics uses optimization techniques

You have data for 100 high school students’ final exam scores. Which measure would reveal the most frequent score?

Prescriptive analytics uses optimization techniques.

Which scenario illustrates Big Data?

A z-score beyond +3 is an outlier.

Which probability distribution is often used to model events in terms of success and failure?

Outlining major goals is a strategic decision.

Which of the following is a continuous random variable?

When working with numeric data, the measure that indicates how far typical values deviate from the mean is the _____.

A manager must first identify the problem.

An event that consists of all outcomes NOT in your initial event A is known as the ____

In a dataset of 100 observations, 60 of them belong to category A. The relative frequency of category A is _____.

Which phase in the decision-making process involves clarifying the exact question or concern to be addressed?

A survey of 50 students found that 30 used flashcards and 25 did not study; how many did both?

In the business analytics process, which type of analytics uses optimization and simulation to recommend actions

A manager scheduling employees is making an operational decision.

What is the median: 200, 250, 300, 400, 300, 250, 500, 450, 200, 350.

A study in which a researcher physically changes one factor to observe its effect on plant growth is a(n) _____.

Suppose a random variable X ~ Uniform(0, 10). What is the probability that X is between 2 and 5?

The simplest measure of variability is range.

A survey of 50 students found that 30 used flashcards, 25 reviewed notes, and 15 did both; how many did not study?

Which of the following statements is true about a normal distribution?

The total area under a normal (Gaussian) curve is always equal to _____.

Consider flipping a fair coin three times. The total number of possible equally likely outcomes is _____.

Which analytics explores historical data?

For a distribution that is perfectly symmetrical and bell-shaped, the mean, median, and mode are _____

A clothing store keeps track of the color of T-shirts sold (red, blue, green, black). This color variable is _____

For two events A and B, the intersection A∩B represents _____.

The total area under a normal curve is always equal to 100.

Which Excel feature quickly arranges the rows in ascending order based on the values in one column?

The ____ of two events is when either A or B occurs.

The ____ of two events is when either A and B occurs.

Operational decisions focus on routine tasks.

A student collects the heights (in inches) of 200 peers. Height is an example of what type of data?

Color of T-shirts sold is categorical data.

If a dataset is normally distributed, what percentage of values fall within 2 standard deviations of the mean

Daily stock prices over 6 months is time series data.

A measure of variability that tell the difference between the maximum and minimum values in a data set.

All of the following are possible shapes of a histogram except _____.

Which of the following best demonstrates the concept of 'Big Data'?

Which decision type focuses on immediate execution?

The sample mean estimates the population mean.

Probability can be defined as _____.

If a raw score is exactly equal to the mean, its z-score is _____

Which measure of central tendency is most affected by extreme values (outliers)?

Probability of two heads in two flips?

A random variable that can only take integer values (like 0, 1, 2, ...) is considered to be

Two events A and B are said to be independent if _____.

The probability of rolling a 4 on a fair six-sided die is _____.

Best example of Big Data?

Medium-range decisions support broader strategies.

When the correlation coefficient between two variables is close to +1, it indicates _____

Before creating any model, a manager must first clearly _____,

To display rows where 'Region' is East, use Filter.

Which approach relies on past success?

A researcher alters the amount of caffeine in sodas to see its effect on alertness. This is an example of a(n) _____

If it’s always worked before, let’s stick to it!

The sample mean is used to estimate which population parameter?

The __ law is used to find the probability of A or B occurring.

If a distribution is skewed to the left, then which of the following is generally true?

In an Excel worksheet, if you want to display only the rows where the 'Region' is “East,” which function would you use?

A store has normally distributed sales with a mean of $1500 and sd of $500. What percentage of days exceed $3000?

A store has normally distributed sales with a mean of 1500 and sd of 500. What percent of sales are within 1000 and 2000

A sample of 200 people showed that 120 prefer coffee over tea. In this context, which group represents the 'population'?

To create graph that shows the shape of a distribution using non-overlapping intervals, which chart would you choose?

Any data point with a z-score beyond +3 or –3 is typically labeled as a(n) _____.

This includes ALL possible outcomes in a probability space and is known as the _____

The _____ law is used to find the probability event A and B occur.

A store has normally distributed sales with a mean of $1500 and sd of $500. What percent of sells are less than $1000?

Descriptive analytics provides insights about the past.

Height is an example of quantitative data.

What percentage falls within 2 standard deviations?

Which decision type focuses on long-term direction?

A college professor records the final letter grades of 80 students in a course. These grades are an example of _____.

You are deciding whether to launch a new product. You outline major goals and a 5-year plan. This decision is _____.

Gathering information from the census about individuals’ home values is an example of_____.