Math 221 Study guides, Class notes & Summaries

System of Equations: Consistent/Inconsistent Has a solution (or many)= Consistent No solution= inconsistent Matrices: Echelon Form Requirements 1. All nonzero rows are above zero rows 2. each leading entry of a row is in a column to the right of the leading entry of the row above it 3. all entries in a column below a leading entry are 0s Matrices: Reduced Echelon Form Requirements all 3 of Echelon Form 4. each leading entry in each nonzero row is a 1 5. each leading 1 is the only nonzer...

uestion 1 2 / 2 pts A student believes that there is a 90% probability of getting an A on the next test. This would be considered: Empirical probability Manufactured probability Subjective probability Classical probability Question 2 2 / 2 pts Given the following information, find the probability that a randomly selected student will be tall, but not very tall. Number of students who are very short: 45, short: 60, tall: 82, very tall: 21 50.5% 39.4% 10.1% 49.5%

Question 1 1 / 1 pts I met with my group and completed this Group Quiz with them. Correct! True Question 2 1 / 1 pts Which of the following variables is/are quantitative? (Mark all that apply.) The telephone number of a randomly selected business in town. The 3 most common brands of car found in the US. Correct! The number of people in a randomly selected classroom on campus. Question 3 1 / 1 pts Students in an Introductory Statistics class at BYU-Idaho were studying prices of col...

cofactor definitioncij(A) = (-1)^(i+j) det(Aij) (-1)^(i+j) is called the sign of the (i,j)-position if A has a row or column of zeros,det(A) = 0 if two distinct rows (or columns) of A are interchanged, the determinant of the resulting matrix is-detA if a row (or column) of A is multiplied by a constant u, the determinant of the resulting matrix isu(detA) if two distinct rows (or columns) of A are identical, detA =0

MATH 221 Statistics for decision making week 3 quiz chapters 1,2,& 3 (100% VERIFIED ANS)

Question 1 2 / 2 pts Let x represent the height of first graders in a class. This would be considered what type of variable: Discrete Continuous Nonsensical Lagging Question 2 2 / 2 pts Let x represent the height of corn in Oklahoma. This would be considered what type of variable: Continuous Discrete Inferential Distributed IncorrectQuestion 3 0 / 2 pts Consider the following table. Age Group Frequency 18-29 9831 30-39 7845 40-49 6869 50-59 6323 60-69 5410 70 and over 52...

MATH 221 Week 8 Quiz Question The table shows data collected on the relationship between the time spent studying per day and the time spent reading per day. The line of best fit for the data is y ˆ=0.16x+36.2. Assume the line of best fit is significant and there is a strong linear relationship between the variables. Studying (Minutes) Reading (Minutes) (a) According to the line of best fit, what would be the predicted number of minutes spent reading for someone who spent 67 minutes studying? ...

MATH 221 Statistics for decision making week 3 quiz chapters 1,2,& 3 (DeVry University)

Understand the problem-reword Devise a plan- identify subgoals, think of the best method (such as making a table or guess and check) Carry out the plan- stay organized and show all work Look back- check your work and make sure you answered the question (working backwards) Polya's problem solving method counting numbers {1,2,3...} Natural numbers includes zero {0,1,2,3...} Whole numbers includes negative numbers {-1,-2,-3,0,1,2,3...} Integers (fancy R) all numbers including decimals ...

MATH 221 Week 2 Discussion Probabilities in Real World (Summer 2023) Latest Verified Review 2023 Practice Questions and Answers for Exam Preparation, 100% Correct with Explanations, Highly Recommended, Download to Score A+ Week 2: Probabilities in Real World Three types of probabilities: 1. Classical (or theoretical) probability is used when each outcome in a sample space is equally likely to occur 2. Empirical (or statistical) probability is based on observations obtained from probability e...