8. A random sample of 30 words from Jane Austen's Pride and Prejudice had a mean length of 4.08letters with a standard deviation of 2.40. A random sample of 30 words from Henry James's WhatMaisie Knew had a mean length of 3.85 letters with a standard deviation of 2.26. Which of thefollowing is a correct expression for the 99% confidence interval for the difference in mean wordlength for these two novels?2.40(a) (4.08-3.85) ±2.756 ( √302.40(b) (4.08-3.85) ± 2.045√302.402(c) (4.08- 3.85) ± 2.04530(d)) (4.08- 3.85) ± 2.045,(e) (4.08- 3.85) ±2.756,2.402302.402302.262.26√30++2.262302.262302.26230

Sample sizes n1=30 , n2=30 Sample means x1=4.08 , x2=3.85 Standard deviation s1=2.40 , s2=2.26

Answered: S. A random sample of 30 words from…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A psychology teacher gave an objective-type test to a class of 400 students and, after seeing the results, decided that the scores were normally distributed. The mean score was 46, and the standard deviation was 15. The teacher assigned a grade of A to all scores of 76 or over, B to scores of 61 to 75, C to scores of 31 to 60, D to scores of 16 to 30 and F to scores below 16. About how many of each grade did the teacher assign? (Round your answers to the nearest whole number. Due to rounding, values may not add to the given sum. Recall that 34% of z-scores lie between 0 and 1, 13.5% lie between 1 and 2, and 2.5% are greater than 2.) A B C D F

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