Empirical rule - Study guides, Class notes & Summaries
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STA 2381- Statistics Exam | Questions with Correct Verified Answers
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T/F: Every estimator has a sampling distribution that is identical to the distribution of the 
population of interest - ANSWER False 
T/F: Chebychev's Theorem is used to help understand the concept of a standard deviation and 
applies to any random variable - ANSWER True 
T/F: The empirical rule is used to help understand the concept of the location of a population 
and applies only to symmetric unimodal continuous random variables - ANSWER False
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WGU C995 Exam Questions & Answers Accurate 100%
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quantitative data - Answer Quantitative data consists of data values that are numbers, representing quantities that can be counted or measured. 
 
The Empirical Rule - Answer According to The Empirical Rule, approximately 68% of the data points in a dataset will be within 1 standard deviation of the mean. 95% of all values are within 2 standard deviations of the mean. 
 
Normal distribution - Answer In a normal distribution data is symmetrical, so the mean, median, and mode are all equal. 
 
mea...
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BUS 302L – Statistics Questions and Answer | Latest Update 2024/2025
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Which is the following is correct? 
a. The probability of a type I error is β. 
b. The probability of a type II error is (1 - β). 
c. The probability of a type II error is α. 
d. The probability of a type I error is (1 - α). 
e. none of the above 
 ~~> e. none of the above 
A manufacturer of contact lenses is studying the curvature of the lenses it 
sells. In particular, the last 500 
lenses sold had an average curvature of 0.5. The population is 
2 | P a g e | © copyright 2024/2025 | G...
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PSYC 2301: Exam 1 Review Questions & Answers(GRADED A+)
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Kinds of Information - ANSWERBelief vs Knowledge: 
- Belief -- propositions unsupported by facts 
- Knowledge -- propositions supported by facts 
Opinion vs fact: 
- Opinion -- inherently involves interpretation 
- Facts -- involves an objective, real observation 
 
Sources of Information: Intuition - ANSWERIntuition is a source of belief, not information 
- Sometimes involves a hard-to-track-down source of a feeling 
- Sometimes involves anecdote 
- Sometimes involves a mistaken analogy ...
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RESEARCH METHODS MIDTERM - MCPHS SPRING QUESTIONS & ANSWERS VERIFIED 100% CORRECT!!
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null hypothesis (H0) - the statistical hypothesis tested by the statistical procedure; usually a 
hypothesis of no difference or no relationship 
Interquartile Range (IQR) - the difference between the first and third quartiles (middle 50% of 
observations) 
dichotomous measure - describes the presence or absence of an attribute (ex smoker/nonsmoker) 
nominal data - categories that vary with no natural order (ex blood types) 
ordinal data - categories with natural order but without clear units (e...
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Straighterline Business Stats Questions and Answers 100% Pass
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Straighterline Business Stats Questions 
 
and Answers 100% Pass 
 
A marketing class of 50 students evaluated the instructor using the following scale: superior, 
good, average, poor, and inferior. The descriptive summary showed the following survey results: 
2% superior, 8% good, 45% average, 45% poor, and 0% inferior. Most students rated the 
instructor as poor or average. 
 
The general process of gathering, organizing, summarizing, analyzing, and interpreting data is 
called ____________. S...
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C207 The mean of 100 bank customers waiting times for teller service is 5.8 minutes with a
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C207 The mean of 100 bank customers waiting times for teller service is 5.8 minutes with a C207 The mean of 100 bank customers waiting times for teller service is 5.8 minutes with a standard deviation of 1.5. What time range would represent a 95.4% probability customer waiting time? To find the time range that represents a 95.4% probability customer waiting time, we can use the concept of standard deviation and the empirical rule (also known as the 68-95-99.7 rule). The empirical rule state...
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WGU C215 Operations Management PVDC Final EXAM Questions With Correct Solutions All Verified By An Expert A+ Graded
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Which definition is used for quality, evaluates how well a product performs its intended function? - ANS Fitness for use 
 
14 points for quality improvement - ANS Which total quality management (TQM) process was developed to stress management's responsibility for quality? 
 
ISO 9000 - ANS Set of international standards on quality management and quality assurance, critical to international business 
-TQM process consists of 13 published standards and guidelines 
-Like when joint commissi...
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MATH 225N Week 6 Statistics Questions and Answers 2023/2024 Rated A+.
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MATH 225N Week 6 Statistics Questions and Answers 2023/2024 Rated A+. 
Question 1 
A statistics professor recently graded final exams for students in her introductory statistics 
course. In a review of her grading, she found the mean score out of 100 points was a x¯=77, 
with a margin of error of 10. 
Construct a confidence interval for the mean score (out of 100 points) on the final exam. 
Answer: (67, 87) 
Question 2 
A random sample of adults were asked whether they prefer reading an e-book ...
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MATH 225N Week 6 Statistics Questions and Answers 2023/2024 Rated A+.
- Exam (elaborations) • 24 pages • 2023
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MATH 225N Week 6 Statistics Questions and Answers 2023/2024 Rated A+. 
Question 1 
A statistics professor recently graded final exams for students in her introductory statistics 
course. In a review of her grading, she found the mean score out of 100 points was a x¯=77, 
with a margin of error of 10. 
Construct a confidence interval for the mean score (out of 100 points) on the final exam. 
Answer: (67, 87) 
Question 2 
A random sample of adults were asked whether they prefer reading an e-book ...
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