MATH 221 Statistics for Decision-Making

MATH 221 Week 8 Discussion |Devry UniversityWeek 8: Reflective Learning & TeachingHi, class! First, I would like tothank youfor all your hard work and postings in the threads. I know that I have a tendency to be a bit of a tougher grader than you may be accustomed too, and that I can often be "nitpicky" in my comments, BUT, it is all done with the mindset that I feel it is my job as an educator to not only teach you math concepts, but

MATH 221 Week 7 Quiz 2 | Devry UniversityWeek 7: Quiz Question 1 (CO 6) The coefficient of determination is represented by what notation? · r2 · r · ρ · β Question 2 (CO 6) Two variables have a positive linear correlation. Does the independent variable increase or decrease as the dependent variable increases? · Independent variable increases · Independent variable would remain the same · Canno

MATH 221 Week 7 Quiz 1 | Devry UniversityQuestion 1 Two variables have a positive linear correlation. Does the dependent variable increase or decrease as the independent variable increases? 7DA. Linear, non-linear, positive and negative correlations (Links to an external site.) (PDF) · Dependent variable decreases · Dependent variable would remain the same · Dependent variable increases · Cannot determine from informa

MATH 221 Week 7 Discussion |Devry University1. Describe the difference between a simple and a multiple regression. Then include an example of each from your own experiences. 2. Determine the regression equation using values you create for x and y for at least 10 pairs of data. Show the regression equation, correlation coefficient, and coefficient of determination. Then switch the x and y values for each data point. Based on that, again show

MATH 221 Week 6 Quiz 2 | Devry UniversityWeek 6: Homework Question 1 A consumer analyst reports that the mean life of a certain type of alkaline battery is no more than 36 months. Write the null and alternative hypotheses and note which is the claim. 6DA. Theory and basics of writing hypotheses (Links to an external site.) (DOCX) · Ho: μ = 36, Ha: μ > 36 (claim) · Ho: μ = 36 (claim), Ha: μ > 36 · Ho: μ > 36, H

MATH 221 Week 6 Quiz 1 | Devry UniversityWeek 6: Quiz Question 1 (CO 5) A company claims that its heaters last at most 5 years. Write the null and alternative hypotheses and note which is the claim. · Ho: μ = 5 (claim), Ha: μ ≥ 5 · Ho: μ = 5 (claim), Ha: μ > 5 · Ho: μ = 5, Ha: μ > 5 (claim) · Ho: μ > 5 (claim), Ha: μ ≤ 5 Question 2 (CO 5) An executive claims that her employees spend no more than 2.5

MATH 221 Week 6 Discussion |Devry UniversityA random sample of 100 medical school applicants at a university has a mean total score of 502 on the MCAT. According to a report, the mean total score for the school’s applicants is more than 499. Assume the population standard deviation is 10.6. Answer the following questions:What would the null and alternate hypotheses be? Which one would be the claim?What kind of test is this, left tailed, right

MATH 221 Week 5 Quiz 2 | Devry UniversityQuestion 1(CO 4) From a random sample of 55 businesses, it is found that the mean time that employees spend on personal issues each week is 5.8 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues? · (5.71, 5.89) · (5.73, 5.87) · (5.74, 5.90) · (5.72, 5.88)Question 2(CO 4) If a confidence interval is given from 8.52 to

MATH 221 Week 5 Quiz 1 | Devry University Question 1 From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 21.69 with a population standard deviation of 3.54. What is the 95% confidence interval for the amount of time spent on administrative issues? 5VA. Confidence intervals with population standard deviation (Links to an external site.) (1:42) 5DA. Concept an

MATH 221 Week 5 Discussion |Devry University1. Look in the newspapers, magazines, or other news sources for results of a survey or poll that show the confidence interval, usually as a +/- amount. Describe the survey or poll and then describe the interval shown. How does knowing the interval, rather than just the main result impact your view of the results?2. Calculate the 90% and 95% confidence intervals of the following data set assuming t