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| Section | Objectives |
|---|---|
| Data-Driven Culture and Communication | - Ethical Considerations in Data Use - Building Data-Informed Organizations - Stakeholder Communication - Presenting Data Insights |
| Business Intelligence and Analytics | - Predictive Analytics Basics - Key Performance Indicators (KPIs) - Data Mining Concepts - Dashboards and Reporting |
| Decision-Making Frameworks | - Risk Analysis and Assessment - Rational Decision Models - Cost-Benefit Analysis - Evidence-Based Decision Making |
| Data Analysis Fundamentals | - Data Visualization Techniques - Data Quality and Cleaning - Descriptive Statistics - Data Types and Measurement Scales |
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問題 #117
What is a disadvantage of a key performance indicator (KPI)?
答案：C
解題說明：
A key performance indicator is useful because it provides a measurable way to track progress toward a goal, but one disadvantage is that it often focuses only on quantitative measures. This can be limiting because not every important aspect of organizational performance is easily captured in numerical form. For example, employee morale, trust, innovation culture, and relationship quality may be highly important but difficult to represent fully through a KPI. When managers rely too heavily on numerical indicators alone, they may overlook meaningful qualitative context or encourage behavior aimed at improving the metric rather than improving the underlying process. The other choices are less accurate. A KPI does not only indicate statistically significant change, and it does not inherently make data-driven measurement difficult. It can be used for both short-term and long-term objectives depending on design. The real weakness is that a KPI may oversimplify performance by emphasizing what can be counted rather than everything that matters. Therefore, the correct answer is that it only accounts for quantitative measures.
問題 #118
Which type of study is also known as a quasi-experimental study?
答案：A
解題說明：
A **quasi-experimental study** is commonly referred to as an **observational study** in data-driven decision making. Unlike true experiments, quasi-experimental studies do not involve random assignment of subjects to treatment and control groups. Instead, researchers observe outcomes in naturally occurring groups and attempt to draw conclusions about relationships between variables.
In observational studies, the researcher does not control the assignment of treatments. As a result, these studies are more susceptible to bias and confounding variables than randomized experiments. However, they are often necessary when controlled experimentation is impractical, unethical, or too costly. For example, studying the impact of policy changes or economic conditions typically relies on observational data.
Blind studies are a form of experimental design used to reduce bias, hypothesis testing is a statistical process rather than a study type, and content validity refers to measurement quality. None of these represent quasi- experimental designs.
In data-driven decision making, observational (quasi-experimental) studies are valuable for identifying associations and generating insights, but analysts must be cautious not to infer causality without proper controls. Therefore, the correct answer is **A**.
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問題 #119
An analyst used multiple linear regression to show how a big box store's sales (y) are predicted by the big box store's advertising expenditure in dollars (variable x1) and the advertising expenditure in dollars of a specialty store (variable x2) in the same market. The estimated regression is y = 651.57 + 92.30x1 # 26.89x2. How are advertising expenditures and sales related in this scenario?
答案：B
解題說明：
The regression equation shows how each advertising variable is related to the big box store's sales while holding the other variable constant. The coefficient for x1, the big box store's advertising, is positive 92.30.
This means that when the big box store increases its own advertising expenditure, predicted sales increase.
The coefficient for x2, the specialty store's advertising, is negative 26.89. This means that as the specialty store spends more on advertising, the big box store's predicted sales decrease. Therefore, the relationship described in option A is correct. Options C and D incorrectly reverse the meaning of the positive coefficient on the big box store's own advertising. Option B is directionally true in a general sense, but the clearest direct interpretation from the equation is the negative effect of the specialty store's advertising on big box store sales, which is exactly stated in option A. Multiple regression allows analysts to isolate these effects and interpret how changes in each predictor influence the dependent variable. Thus, the correct answer is that if the specialty store increases its advertising expenditures, it will decrease the big box store's sales.
問題 #120
An analyst used multiple linear regression to show how a big box store's sales (y) are predicted by the big box store's advertising expenditure in dollars (variable x1) and the advertising expenditure in dollars of a specialty store (variable x2) in the same market. The estimated regression is y = 651.57 + 92.30x1 # 26.89x2. How are advertising expenditures and sales related in this scenario?
答案：B
問題 #121
Which exam type compares one student's performance on a test to other students' performance?
答案：A
解題說明：
A norm-referenced test compares a student's performance to that of other students. The purpose of this type of assessment is to rank or position individuals relative to a larger group, such as peers in a class, district, or national sample. Scores on norm-referenced tests are interpreted in relation to the performance of others, often through percentiles, rankings, or standard scores. This contrasts with criterion-referenced tests, which measure whether a student has achieved specific learning objectives or mastered defined content, regardless of how other students perform. An essay test is a format, not a reference standard. An ad hoc test is not the recognized statistical or assessment category being described here. Since the question focuses on comparing one student's results to the performance of others, the correct answer is norm-referenced test. This type of comparison is commonly used in standardized testing when the goal is to evaluate relative standing rather than absolute mastery.
問題 #122
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