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STA 261 Final Exam 2025: Questions and Answers, Exams of Statistics

Miami University – HamiltonStatistics

A comprehensive set of questions and answers for the sta 261 final exam, covering key concepts in statistics. It includes multiple-choice questions with correct answers, addressing topics such as descriptive and inferential statistics, sampling, distributions, hypothesis testing, and regression analysis. The document serves as a valuable study resource for students preparing for the exam.

Typology: Exams

2024/2025

Available from 02/14/2025

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STA 261 FINAL EXAM 2025 (REAL EXAM) | ALL
QUESTIONS AND CORRECT ANSWERS |
GRADED A+ | LATEST EXAM | VERIFIED
ANSWERS
The distinction between descriptive and inferential statistics is that: ---------
CORRECT ANSWER-----------------descriptive statistics describe data sets,
inferential statistics make predictions for the populations
The z-score and percentile are measures of ---------CORRECT ANSWER---
--------------relative location
The sampling frame is the ---------CORRECT ANSWER-----------------list of
all elements in a population
The percentage of data points falling at or below the upper quartile is --------
-CORRECT ANSWER-----------------75
A distribution can have more than one ---------CORRECT ANSWER-----------
------mode
In terms of sensitivity, how would it be ordered
least sensitive<sensitive<most sensitive ---------CORRECT ANSWER--------
---------median<trimmed mean<mean
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Download STA 261 Final Exam 2025: Questions and Answers and more Exams Statistics in PDF only on Docsity!

STA 261 FINAL EXAM 2025 (REAL EXAM) | ALL

QUESTIONS AND CORRECT ANSWERS |

GRADED A+ | LATEST EXAM | VERIFIED

ANSWERS

The distinction between descriptive and inferential statistics is that: --------- CORRECT ANSWER-----------------descriptive statistics describe data sets, inferential statistics make predictions for the populations The z-score and percentile are measures of ---------CORRECT ANSWER--- --------------relative location The sampling frame is the ---------CORRECT ANSWER-----------------list of all elements in a population The percentage of data points falling at or below the upper quartile is --------

  • CORRECT ANSWER----------------- 75 A distribution can have more than one ---------CORRECT ANSWER----------- ------mode In terms of sensitivity, how would it be ordered least sensitive<sensitive<most sensitive ---------CORRECT ANSWER-------- ---------median<trimmed mean<mean

Suppose that for a set of numeric data, where the numbers are not all different, the standard deviation is less than 1.0. Then it must be true that -- -------CORRECT ANSWER-----------------the variance<standard deviation Discrete variable ---------CORRECT ANSWER-----------------whole number continous variable ---------CORRECT ANSWER-----------------decimal The event, "not A" is called the __________ of "event A" ---------CORRECT ANSWER-----------------complement Given a choice of unbiased statistics, the best statistic would be the one with a sampling distribution that ---------CORRECT ANSWER----------------- has the smallest variance A good fit of the simple linear regression model would be ---------CORRECT ANSWER-----------------a relatively large r2 and a relatively small standard error Type 1 error ---------CORRECT ANSWER-----------------rejecting Ho when Ho is true Type 2 error ---------CORRECT ANSWER-----------------failing to reject Ho when Ho is false

Negative z-score ---------CORRECT ANSWER-----------------observation is below the mean Population ---------CORRECT ANSWER-----------------total set of subjects Sample ---------CORRECT ANSWER-----------------subset of the population Parameter ---------CORRECT ANSWER-----------------population Statistic ---------CORRECT ANSWER-----------------sample Categorical graphs ---------CORRECT ANSWER-----------------bar graphs and pie charts Quantitative graphs ---------CORRECT ANSWER-----------------dot plots stem and leaf plots histograms Boxplot ---------CORRECT ANSWER-----------------uses the middle 50% of data q1 to q as sample size ________

standard deviation________ ---------CORRECT ANSWER----------------- increases decreases point estimate ---------CORRECT ANSWER-----------------unbiased sampling distribution centered at the parameter small standard deviation margin of error ---------CORRECT ANSWER-----------------the precision of the estimate at the specified confidence interval x variable ---------CORRECT ANSWER-----------------explanatory y variable ---------CORRECT ANSWER-----------------response r ---------CORRECT ANSWER-----------------the effect x has based on y between - 1 and 1 r2 ---------CORRECT ANSWER-----------------the variation of y that is or is not explained by x between 0 and 1 weak r ---------CORRECT ANSWER-----------------0 and 0.

x2 homogeneity test Ho and Ha ---------CORRECT ANSWER----------------- Ho: the proportions are equal Ha: not all the proportions are equal x2 goodness of fit test Ho and Ha ---------CORRECT ANSWER----------------- Ho: the variable has the specified distribution Ha: the variable does not have the specified distribution Is mean GPA for Miami University students higher than mean GPA for students at Wright State University? ---------CORRECT ANSWER------------- ----independent samples t-test Is the proportion of males the same in Engineering, Communications and Business at Miami University? ---------CORRECT ANSWER-----------------x homogeneity test Does a mock examination increase exam scores? In a class of 30 statistics students, a mock exam was given one week prior to exam day for the second exam, where no mock exam was given prior to the first exam. The test scores were then compared. ---------CORRECT ANSWER----------------- paired t-test Do more male students than female students hold part-time jobs? --------- CORRECT ANSWER-----------------one mean t-test Are weights (lbs) of U.S. adults normally distributed? ---------CORRECT ANSWER-----------------x2 goodness of fit test

Is there an association between living on/off campus and year in school (e.g., Freshman, Sophomore)? ---------CORRECT ANSWER-----------------x independence test Is there a difference in mean exam score based on color of ink used for grading exams? ---------CORRECT ANSWER-----------------one way ANOVA What is the proportion of orange M&M's in a bag of candy? --------- CORRECT ANSWER-----------------one proportion z-test is there a linear relationship between height and weight aptitude score? ---- -----CORRECT ANSWER-----------------regression t-test In Ohio, what is the average amount spent on groceries each month per student? ---------CORRECT ANSWER-----------------two proportion z-test proportion assumptions ---------CORRECT ANSWER----------------- categorical random number of successes/failures greater than or equal to 15 mean assumptions ---------CORRECT ANSWER-----------------quantitative random population distribution is normal or greater than or equal to 30