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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Statistical Concepts & Descriptive Analytics | 25% | - Data visualization: charts, graphs, dashboards - Data types, measurement scales, sampling methods - Measures of central tendency, dispersion, distribution |
| Topic 2: Predictive Analytics & Regression | 20% | - Interpreting coefficients, R-squared, significance - Simple & multiple linear regression - Forecasting & trend analysis |
| Topic 3: Decision Models & Prescriptive Analytics | 15% | - Quality & process improvement tools - Decision trees, payoff matrices, expected value - Optimization, sensitivity analysis |
| Topic 4: Foundations of Data-Driven Decision Making | 20% | - Types of analytics: descriptive, predictive, prescriptive - Ethics, privacy, and data governance - Role of data in business decisions |
| Topic 5: Probability & Statistical Inference | 20% | - Probability rules, distributions, expected value - Correlation vs. causation - Hypothesis testing, p-values, confidence intervals |
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NEW QUESTION # 95
Which graphical display is used to examine the distribution of a data set with quartiles?
Answer: B
Explanation:
Aboxplotis specifically designed to display the distribution of a dataset using quartiles. In data-driven decision making, boxplots visually summarize data through the minimum, first quartile, median, third quartile, and maximum.
Boxplots are useful for identifying spread, central tendency, skewness, and potential outliers. Scatterplots and bivariate charts analyze relationships between variables, while Pareto charts rank categorical data by frequency.
Because quartiles are the defining feature of a boxplot, the correct answer isC.
NEW QUESTION # 96
Which exam type compares one student's performance on a test to other students' performance?
Answer: D
Explanation:
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.
NEW QUESTION # 97
Which element is associated with control charts?
Answer: B
Explanation:
Control charts are a core tool in statistical process control and are used to monitor variation in a process over time. One of their defining features is the inclusion of upper and lower control limits. These limits help determine whether process variation is consistent with common-cause variation or whether unusual, assignable causes may be affecting performance. The chart typically includes a center line representing the process average, along with upper and lower limits that establish the acceptable range of variation under stable conditions. When points fall outside these limits or show nonrandom patterns, the process may require investigation. While hypothesis testing and correlation are important statistical concepts, they are not the primary identifying elements of a control chart. A reliability index may be used in certain engineering or quality contexts, but it is not the standard feature that defines control charts. Therefore, the element most directly associated with control charts is upper and lower limits, since those boundaries are central to evaluating whether a process remains in statistical control over time.
NEW QUESTION # 98
Why would a human resources department use both mean and median when doing a salary evaluation of a department?
Answer: A
Explanation:
Using both mean and median helps identifyoutliers, such as very high executive salaries that skew the average. A large difference between the two indicates uneven distribution.
Thus, the correct answer isC.
NEW QUESTION # 99
A sample of 1,020 people was asked how many minutes they exercise on a typical day. The data were plotted and determined to beskewed leftwith a mean of 44.75 minutes.
Which boxplot correctly graphs this data?
Answer: C
NEW QUESTION # 100
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