One of the items on a student survey for an introductory sta…

One of the items on a student survey for an introductory statistics course was “Rate your intelligence on a scale of 1 to 5.” Here is the distribution of this variable for the students in the class. Intelligence Rating (X) Proportion or p(X) 1 0 2 .1 3 .2 4 .3 5 .4   A.) What is the average intelligence rating for the students? (In other words, what is the expected value, E(X)?) [a]   B.) What is the standard deviation, SD(X)? [b] Retype your answer [c]   Note: If needed, type your answer to three decimal places.

A Quinnipiac University poll conducted from Jan 28 to Feb 1,…

A Quinnipiac University poll conducted from Jan 28 to Feb 1, 2021 asked 1075 Americans, “Do you think that the coronavirus pandemic in the United States is a crisis, a problem but not a crisis, or not a problem at all?” 68% said “a crisis”. (Use at least 3 decimal places once the 0’s stop in your computations for this problem, but still enter your final answers to 3 decimals.) If you were to find a 95% confidence interval for the proportion of all Americans who thought it was a crisis, would you use a z-value (Z) or a t-value (T)? [a] What would its numerical value be? [b]   Find a 90% confidence interval for the proportion of all Americans who would also say “a crisis”. [c] [d] or ( [e] , [f] )

    Suppose a 3-step experiment is comprised of Event 1 fol…

    Suppose a 3-step experiment is comprised of Event 1 followed by Event 2 followed by Event 2 again. The outcomes for each step are independent of each other. Use the information in the graphical displays to determine the various probabilities. (Hint: You may want to start by filling out the tree diagram) (Additional Hint for non-native English speakers: The letters A, E, I, O, or U are considered vowels.)   What is the probability of obtaining exactly two vowels?

A 64-year-old man is referred to your clinic with ischemic r…

A 64-year-old man is referred to your clinic with ischemic rest pain of the left leg and a nonhealing ulcer of his right great toe.  His femoral pulses are nonpalpable bilaterally.  He does not have diabetes. His renal function is normal.  Which of the following is the most appropriate way to assess his vascular anatomy prior to revascularization?