Math 221 - Guides d'étude, Notes de cours & Résumés

2025 MATH 221 STATISTICS EVALUATION QUESTIONS WITH ANSWERS GRADED A+ 2025/2026 Fifty-four percent of US teens have heard of a fax machine. You randomly select 12 US teens. Find the probability that the number of these selected teens that have heard of a fax machine is exactly six (first answer listed below). Find the probability that the number is more than 8 (second answer listed below). 0.284, 0.160 0.284, 0.120 0.217, 0.280 0.217, 0.120 - 0.217, 0.120 The probability of someone orde...

2025 MATH 221 STATISTICS FINAL EXAMS QUESTIONS WITH ANSWERS GRADED A+ 2025/2026 If a confidence interval is given from 8.52 to 10.23 and the mean is known to be 9.375, what is the maximum error? 0.428 1.710 0.855 8.520 - 0.855 Which of the following is most likely to lead to a large margin of error? small mean large sample size small sample size small standard deviation - small sample size From a random sample of 41 teens, it is found that on average they spend 31.8 hours each week...

A random number generator is used to select a number from 1 to 100. What is the probability of selecting an even number? Correct Answer 0.50 What is the sample space of rolling two four-sided die? Correct Answer (1,2)(1,3)(1,4)(2,2)(2,3)(2,4)(3,4)(4,4) Consider the table below Response (number of cats owned); None One, Two, Three, Four or more Frequency; 659, 329, 52, 13, or 8 What is the probability that the next person asked has four or more cats? Correct Answer Less than 1% Consid...

What is the intersection of sets Correct Answer elements common to both A and B What is the union of sets Correct Answer all elements in A or B What is a complement of a set Correct Answer all elements given in the universal set that are not in A What is the relative complement of a set Correct Answer all elements in B that are not in A Linear function definition Correct Answer increases by a constant value of one common difference Geometric function definition Correct Answer mult...

d/dx (log b X) Correct Answer 1/ (X ln(b)) d/dx (a^x) Correct Answer a^x (ln a ) d/dx (tan x) Correct Answer sec^2x d/dx (cot x) Correct Answer -csc^2 x d/dx (csc x) Correct Answer -csc x * cot x d/dx (sec x) Correct Answer sec x * tan x d/dx (arctan x) (TEST) Correct Answer 1/(x^2 + 1) d/dx (arcsin x) (TEST) Correct Answer 1/ (sqrt (1- x^2)) d/dx (arcsec x) (TEST) Correct Answer 1/ (sqrt (x( x^2- 1))) d/dx (sinh x) (TEST) Correct Answer cosh x d/dx (cosh x) (TEST) ...

Secant Line Correct Answer The line connecting any two points on a curve. Tangent Line Correct Answer The line that best approximates a function near a point A. It's the limit of secant lines connecting points A & B as B approaches A. Squeeze Theorem Correct Answer If f(x)≤g(x)≤h(x) and if the top and bottom functions both have the same limits, we can conclude that the middle function must have the same limit. Continuity Correct Answer A function, f, is continuous at x=a if the lim...

2025 MATH 221 STATISTICS QUESTIONS WITH ANSWERS GRADED A+ 2025/2026 Determine the minimum sample size required when you want to be 95% confident that the sample mean is within two units of the population mean. Assume a population standard deviation of 4.3 in a normally distributed population. 20 22 16 18 - 18 Determine the minimum sample size required when you want to be 99% confident that the sample mean is within 0.50 units of the population mean. Assume a population standard deviat...

Math 221 Quiz Week 1 to Week 7 Combined Quizzes with complete solution

MATH 221 Week 3 Discussion Discrete Probability Variables (Summer 2023) Latest Verified Review 2023 Practice Questions and Answers for Exam Preparation, 100% Correct with Explanations, Highly Recommended, Download to Score A+ Discrete Probability Distributions