Statistics math 221 Study guides, Class notes & Summaries

Question 1 2 / 2 pts (CO 1) A survey of 128 DeVry statistics students found that 83% read the announcements each week. What is the population and what is the sample? Population: DeVry statistics students; Sample: the 83% that read the announcements weekly Population: all statistics students reading announcements weekly; Sample: the 128 DeVry statistics students Population: all statistics students; Sample: 128 DeVry statistics students Correct! Population: DeVr...

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...

STATISTICS MATH 221 FINAL EXAM REVIEW QUESTIONS SOLUTIONS GUIDE (WITH PROF. HEARD’S COMMENTS IN BLUE) 1. Explain the difference between a population and a sample. In which of these is it important to distinguish between the two in order to use the correct formula? mean; median; mode; range; quartiles; variance; standard deviation. Solution: A sample is a subset of a population. A population consists of every member of a particular group of interest. The variance and the standard de...

Math 221 Statistics Exam With Complete Solution...

Question 1 2 / 2 pts The average age of all employees at a local store would be considered a: Homework Help: 1DA. Population/parameter/sample/statistic/inferential/descriptive (Links to an external site.) (DOCX) Correct! Parameter Statistic Sample Population Question 2 2 / 2 pts In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 1000 would be considered a: Homework Help: 1DA. Population/parameter/sample/statistic/inferen...

Question 1 0 / 2 pts The length of time a person takes to decide which shoes to purchase is normally distributed with a mean of 8.54 minutes and a standard deviation of 1.91. Find the probability that a randomly selected individual will take less than 6 minutes to select a shoe purchase. Is this outcome unusual? Homework Help: 4VA. Calculating normal probabilities (Links to an external site.) (2:18) 4DA. Description of normal distribution, area, and probabilities, definition of unusual even...

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

Math 221 Statistics Exam Questions With Complete Solution 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 3.23. What is the 95% confidence interval for the amount of time spent on administrative issues? A. (19.24, 24.14) B. (21.78, 22.60) C. (20.86, 22.52) D. (20.71, 22.67) - CORRECT ANSWERS C. (20.86, 22.52) If a confidence interval is given ...

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