Statistics math 221 - Study guides, Class notes & Summaries

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 Test 1 Questions And Answers With Complete Solution Statistics - CORRECT ANSWERS The scientific discipline that provides methods to help us make sense of data Population - CORRECT ANSWERS The entire collection of individuals or measurements about which information is desired Sample - CORRECT ANSWERS A part of the population selected for study Descriptive Statistics - CORRECT ANSWERS Th...

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 2 / 2 pts According to company records, the probability that a washing machine will break in the first year is 4%. This would be considered: Homework Help: 2DA. Definition of probabilities and classical, empirical, subjective probabilities (Links to an external site.) (DOCX) Subjective probability Manufactured probability Correct! Empirical probability Classical probability Question 2 2 / 2 pts Given the following information, find the pr...

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...

Statistics - ANSWER-The scientific discipline that provides methods to help us make sense of data Population - ANSWER-The entire collection of individuals or measurements about which information is desired Sample - ANSWER-A part of the population selected for study Descriptive Statistics - ANSWER-The branch of statistics that includes numerical, graphical, and tabular methods for organizing and summarizing data Inferential Statistics - ANSWER-The branch of statistics that includes me...

MATH 225N Week 7 Assignment- Developing Hypothesis and understanding Possible Conclusion for Proportions Identify the null and alternative hypotheses for an experiment with one population proportion Question Devin is a researcher for a pharmaceutical company testing whether a new prescription pain medication causes patients to develop nausea. The medication would have to be scrapped if more than 6% of patients who take the medication develop nausea on a regular basis. Devin randomly selected 461...

MATH 225N Week 7 Assignment- Developing Hypothesis and understanding Possible Conclusion for Proportions Identify the null and alternative hypotheses for an experiment with one population proportion Question Devin is a researcher for a pharmaceutical company testing whether a new prescription pain medication causes patients to develop nausea. The medication would have to be scrapped if more than 6% of patients who take the medication develop nausea on a regular basis. Devin randomly selected 461...

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) - ANSWER-C. (20.86, 22.52) If a confidence interval is given from 45.82 up to 55.90 and the mean is known to be 50.86, what is the margin of error? 2.52...

Question 1 1 / 1 pts I met with my group and completed this Group Quiz with them. True False Ques 1 / 1 pts tion 2 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. The number of people in a randomly selected classroom on campus. Ques 1 / 1 pts tion 3 Students in an Introductory Statistics class at BYU-Idaho were studying prices of cold cereal at groc...