STA220H1 Study Guide - Final Guide: Laundry Detergent, Simple Random Sample, Statistical Significance

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pinkworm736

25 Oct 2012

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STA220H1 Full Course Notes

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Sta220h term test oct 27, 2010. Aids: one sided handwritten aid sheet + non-programmable calculator. Check that you have all the consecutively numbered pages of this test, up to the last page which says end at the bottom. A standard normal table is attached at the end of this test. Best marks go to best answers, as a general rule, particularly where some explanation is requested, so try to be complete but also clear and concise; a bunch of nonsense will actually decrease your grade. Explanations should be in the context of the actual study. Be sure to proportion your time carefully among the questions and limit your time spent on any single question. The correct answer for a difficult or lengthy question may not be worth any more marks than for a simple or short one. Easy questions are just as likely to be at the end, as at the beginning of the exam.

Related Questions

Module 4 Minitab Assignment

Instructions:

Below you will find questions. Please use the provided data to complete the tasks and to answer the questions.

For the standard normal distribution, Z, find the proportion (percentage) of observations that satisfies each of the following statements. In each case, use a graph of the Normal curve and shade the area under the curve that is the answer to the question.

Values of z larger than 2.33.

Between z = −1.50 and z = 1.18.

Values of z less than 1.19.

A set of final examination grades in an introductory statistics course was found to be normally distributed with a mean of 77 and a standard deviation of 8. For each of the following produce a normal distribution plot showing the appropriate shaded area.

What percentage of students scored lower than 70 on this exam?

What percentage of students scored between 81 and 89?

What percentage of students scored higher than 90 on this exam?

What is the 80th percentile of scores?

What is the 95th percentile of scores?

sbmrgd

Carol holds a two-digit number X and wants Alice and Bob to recover the number. She gives them the following information.

Both Alice and Bob know that the number held by Carol is one of the following.

21 26
31 32 35
42 44
52 54 57
62 67

Alice knows the number of ones of X but not the number of tens.
Bob knows the number of tens of X but not the number of ones.

Alice and Bob exchange the following messages.

(a) Bob to Alice: ’You might know X’.
(b) Alice to Bob: ’I did not, but, after what you have said, I do’.

Based on the above information, please answer the following questions. For each question, please accompany your answer with a short explanation of why your believe your answer is correct. Marks will not be awarded for answers without any explanation.

(a) Based on the statement of Bob it is possible to narrow down candidates for the number of tens from the initial five possibilities down to just two. What are these two possibilities? (7 marks)
(b) Based on the ’I did not’ statement of Alice, the number of candidates for X can be narrowed down to just three. What are these candidates (6 marks)
(c) The remaining part of Alice’s statement allows to identify X precisely. What is X? (7 marks)

cerisewombat429

4. In this question, you will be shown a snippet of code. You will then be shown the output from either the compiler or the Java virtual machine and be asked what the error is and how to fix it. In each case, your answer should include the line number of the problem, a one or two sentence explanation as to why the issue occurs, and a specific fix for the problem. Your fix should mention the exact line or lines of code you'd add/change/delete. Total for this question (5 parts): (15 points) (a) Consider the following class: import java.util.Scanner; public class Hockeystandings //This method should calculate the percentage of games in which the team lost. public static double computePercentageLosses (int numwins, int numLosses) return numLosses/ (numwins + numLosses) * 100; public static void main(String[] args) { Scanner reader - new Scanner (System.in); System.out.println("Enter the number of wins for the Maple Leafs"); int numLeafwins = reader.nextInt (); System.out.println("Enter the number of losses for the Maple Leafs"); int numLeaflosses-reader.nextInt (); System.out.println("Enter the number of wins for the Canadiens"); int numCanadienswins – reader.nextInt (); System.out.println("Enter the number of losses for the Canadiens"); int numCanadienslosses = reader.nextInt (); double mapleLeafs Record - computePercentage Losses (numLeafwins, numLeaf Losses); double canadienskecord - computePercentage Losses (numCanadienswins, nuCanadienslos305): if (canadiens Record > mapleleafsRecord) { System.out.println("Of course the Leafs did worse."); else { System.out.println("Wow, that hasn't happened for a long time!"); The point of the program is to ask the user to enter numbers representing the wins and losses of the Maple Leafs and Canadiens in a season. The code compiles successfully and when you run the program, you enter the values: 2 80 40 42 into the keyboard. You expect that the program will output the message Of course the Leafs did worse since they had fewer wins. However, to your surprise, the output of the program is: Wow, that hasn't happened for a long time! Why is this the case and fix the error?

STA220H1 Study Guide - Final Guide: Laundry Detergent, Simple Random Sample, Statistical Significance

STA220H1 Full Course Notes

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