CONFIDENCE INTERVAL CONCEPTS Look in the newspapers, magazines, and other news sources for results of a survey or poll that show the confidence interval, usually shows as a +/- some 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 […]

INTERPRETING NORMAL DISTRIBUTIONS Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?

DISCRETE PROBABILITY VARIABLES   For this discussion you will use technology to create a short 1-2 minute multimedia post/presentation.   Suggestions: Narrated PowerPoint, recorded video (.mp4), Screencast-O-Matic (.mp4), or a similar tool of your choice. Video can be recorded directly within a post as well, but make sure to plan out in advance what you […]

PROBABILITIES IN REAL WORLD   Look online and find an article published within the past 4 weeks that includes a reference to probabilities, means, or standard deviations.  These articles might be discussing weather events, investing outcomes, or sports performance, among many other possible topics.   Your first post should include a summary of the article […]

DESCRIPTIVE STATISTICS If you were given a large data set, such as the sales over the last year of our top 100 customers, what might you be able to do with these data? What might be the benefits of describing the data?   Alternative: Look for examples of descriptive statistics in the news or on […]

Question 1The age of every fourth person entering a department store. The selected individuals would be considered a:     Statistic     Parameter     Population   Correct!     Sample   Question 2 In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 1000 would be considered a: […]

Question 1Two variables have a negative non-linear correlation. Does the dependent variable increase or decrease as the independent variable increases?     Dependent variable decreases     Dependent variable increases     Cannot determine from information given     Dependent variable would remain the same   Question 2What does the variable ρ represent?     […]

Question 1A 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.     Ho: μ ≤ 36, Ha: μ > 36 (claim)     Ho: μ > 36, Ha: μ ≤ 36 […]

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 3.23. What is the 95% confidence interval for the amount of time spent on administrative issues?     (19.24, 24.14)     (20.71, […]

Question 1The 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?     Probability […]