Math 221 week - Study guides, Class notes & Summaries

MATH 221 Week 1 Homework: Statistics for Decision-Making A recent survey of the alumni of a university indicated that the average salary of 10,000 of its 200,000 graduates was $130,000. The $130, 000 would be considered a: Population Parameter Correct! Statistic Sample Question 2 2 / 2 pts A survey of 1050 students was taken from a university with 19,500 students. The 19,500 would be considered a: Parameter Sample Correct! Population Statistic Question 3 2 / 2 pts Inferential statistics is when ...

Question: The age of every fourth person entering a department store. The selected individuals would be considered a: Question: The chances of winning the Maryland lottery are one chance in twenty-tw o million. The probability would … an example of: Question: The milligrams of tar in 30 cigarettes would … : Question: Marriage status (married, single, etc.) of the faculty at a university would … : Question: Sixteen students are randomly … from each grade level at a high school and asked a...

(MATH 221 Week 6 Quiz) Question: (CO 5) A company claims that its heaters last more than 5 years. Write the null and alternative hypotheses and note which is the claim. Question: (CO 5) An executive claims that her employees spend no more than 2.5 hours each week in meetings. Write the null and alternative hypotheses and note which is the claim. Question: (CO 5) In hypothesis testing, a key element in the structure of the hypotheses is that the null hypothesis has the Question: (CO 5) A landscap...

Joseph and Kandy when we develop a confidence interval (CI) we are computing a range of values that’s likely to include a population value with a certain degree of confidence. It is an interval that tells us that the population means lies between an upper and lower interval. What are commonly … confidence intervals? (Responses to the question above) Show Less

(CO 5) A company claims that its heaters last more than 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 Correct Answer Ho: μ ≤ 5, Ha: μ < 5 (claim) (CO 5) An executive claims that her employees spend no less than 2.5 hours each week in meetings. Write the null and alternative hypotheses and note which is the claim. Ho: μ ≤ 2.5 (claim), Ha: μ > 2.5 Correct Answer ...

Statistical Concepts: Confidence Intervals Data Simulation Normal Probabilities Short Answer Writing Assignment All answers should be complete sentences. We need to find the confidence int erval for the SLEEP variable. To do this, we need to find the mean and standard deviation with the Week 1 spreadsheet. Then we can the Week 5 spreadsheet to find the confidence interval. First, find the mean and standard deviation by copying the SLEEP variable and pasting it into the Week 1 spreadsheet. Write ...

Question 1 2 / 2 pts (CO6) 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? (5.74, 5.90) (5.73, 5.87) (5.72, 5.88) Correct! (5.71, 5.89) Question 2 0 / 2 pts (CO6) If a confidence interval is given from 8.54 to 10.21 and the mean is known to be 9.375, what is the maximum erro...

Describe the difference between bar charts, histograms, Pareto charts, including how they are … and in what situations are each most effectively … ? Given the following data points, describe the steps to create a histogram with 5 classes. Show Less

Question 1 0 / 2 pts (CO 1) A survey of 385 people who like wild sweaters found that 74% had a wild holiday sweater. What is the population and what is the sample? Population: people who like wild sweaters: Sample: the 385 people who had a wild holiday sweater Population: people who like sweaters; Sample: the 74% that had a wild holiday sweater Population: people who like wild sweaters; Sample: the 385 people who like wild sweaters Population: people who like wild sweaters; Sample: the ...