2.2 Use case 2: A consumer organization tested two paper shredders, the Piranha and the Crocodile, designed for home use. Each of 10 randomly selected volunteers shredded 100 sheets of paper with the Piranha, and then another sample of 10 randomly selected volunteers each shredded 100 sheets with the Crocodile. The Piranha took an average of 203 seconds to shred 100 sheets with a standard deviation of 6 seconds. The Crocodile took an average of 187 seconds to shred 100 sheets with a standard deviation of 5 seconds. Assume that the shredding times for both machines are approximately normally distributed with equal but unknown standard deviations. a. Construct a 99% confidence interval for the difference between the two population means. b. Using a 1% significance level, can you conclude that the mean time taken by the Piranha to shred 100 sheets is higher than that for the Crocodile? c. What would your decision be in part b if the probability of making a Type I error were zero? Explain.

2.2 Use case 2: A consumer organization tested two paper shredders, the Piranha and the Crocodile, designed for home use. Each of 10 randomly selected volunteers shredded 100 sheets of paper with the Piranha, and then another sample of 10 randomly selected volunteers each shredded 100 sheets with the Crocodile. The Piranha took an average of 203 seconds to shred 100 sheets with a standard deviation of 6 seconds. The Crocodile took an average of 187 seconds to shred 100 sheets with a standard deviation of 5 seconds. Assume that the shredding times for both machines are approximately normally distributed with equal but unknown standard deviations. a. Construct a 99% confidence interval for the difference between the two population means. b. Using a 1% significance level, can you conclude that the mean time taken by the Piranha to shred 100 sheets is higher than that for the Crocodile? c. What would your decision be in part b if the probability of making a Type I error were zero? Explain.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

I need the answer as soon as possible
Which of the following statement(s) is/are correct about recursion? Group of answer choices A.indication of good use of recursion: difficulty to trace down the sequence of recursive calls B.gives cleaner code but has high cost C.never be used as substitute for a simple ‘for’ loop D.bad idea to use it to evaluate simple mathematical functions. E.All of the above
Why do we need to consider consequences of a type I error when we're selecting an alpha value?
PLEASE TYPE ONLY**** 25 horses - we need to find the fastest 3 in correct order 1st,2nd and 3deach race consists of 5 horses - how many races you need , explain solution.
Midterm Practice Problems 1. Use recursion to write a function count_ones that returns how many Is there are in a number n when represented in decimal (base 10). For example, 1231 has two 1s. You can assume that n is nonnegative and at most 9 digits long. Do not use global (or static) variables. In main perform at least three tests of count_ones and use assert to check that the returned value is correct. Your function should have the following prototype: // count_ones (n) returns the number of is in the decimal representation of n // requires: 0 <= n < 10^9 int count_ones (int n);
How do you do 9)??
could you please help me in this question and thank you so much
What do parentheses do in mathematical equations? a. Ensure addition functions are performed before subtraction functions b. Ensure multiplication functions are performed before division functions c. Ensure multiplication functions are performed before addition functions d. Ensure that whatever operation is inside the parentheses is performed first
Here is a python 3 question that is asking for prime numbers its a _name_maid function. How do we go about it?