4. A very large population has a mean of 180 and a standard deviation of 24. Oneday a sample of 64 observations is taken. On another day a sample of 100observations is taken. Which of the following is true?The standard error of the mean will be smaller with 64 observations.It is impossible to determine any of the above given the available information.The standard error of the mean will be larger with 64 observations.The standard error of the mean will be the same with either 64 or 100observations.

Formula : Standard error : SE = σ_x̄ = σ/√n

Answered: 4. A very large population has a mean…

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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3. If the standard deviation for a set of data is 0, which of the following must be true? a. All of the data values equal 0. b. All of the data values are negative. c. All of the data values are identical. d. None of the above must be true since standard deviation cannot be equal to 0.
. 18 For a binomiał distribution the mean is 6 and the standard deviation is V2. Write out all the terms of the binomial distribution.
QUESTION 4 4.70d: What is the requested percentage? Hint: L-08 I. 24.7% II. 56.6% III. 43.4% IV. 75.3%
3. The smallest score in a population is X=5 and the largest score is X= 10. Based on this information, you can conclude that the а. mean is greater than 10 b. standard deviation is smaller than 5 c. standard deviation is less than 6 с. d. standard deviation is greater than 6
4.
Which of the following statements is correct: A. The standard deviation of a data set can never be zero. B. A negatively skewed data set has a negative standard deviation. C. If you score 82% on an exam, your exam is in the 82nd percentile of the class. D. The standard deviation of a data set can never be negative. E. The Z-score of a data point can never be negative.
1. Find each of the requested values for a population with a mean of  = 40, and astandard deviation of  = 8A. What is the z-score corresponding to X = 52?B. What is the X value corresponding to z = - 0.50?C. If all of the scores in the population are transformed into z-scores, what will be the values for the mean and standard deviation for the complete set of z-scores?D. What is the z-score corresponding to a sample mean of M=42 for a sample of n = 4 scores?E. What is the z-scores corresponding to a sample mean of M= 42 for a sample of n = 6 scores? 2. True or false:a. All normal distributions are symmetricalb. All normal distributions have a mean of 1.0c. All normal distributions have a standard deviation of 1.0d. The total area under the curve of all normal distributions is equal to 1 3. Interpret the location, direction, and distance (near or far) of the following zscores: a. -2.00b. 1.25c. 3.50 d. -0.34 4. You are part of a trivia team and have tracked your team’s performance…
A real estate agent claims that mean household incomes in Fairfax and Arlington are equal. Draw 32 residents randomly from Fairfax neighborhood we found the average income is $82,750 with population standard deviation $2900; while from 30 Arlington residents, the average income 81,200 with with population deviation $2225. f you don't trust its claim, what is the H 0, and what is the H a ? If you support its claim, what is the H 0, and what is the H a ?
1.4 Which of the following statements is true? a. The sum of the deviations from the mean is always zero. b. The sum of the squared deviations from the mean is always zero. c. The standard deviation is always smaller than the variance. d. The distance between the first and third quartiles is twice the distance between the first and second quartiles. e. none of these
Exam 1 scores have a mean of 500and a standard deviation of 110, while exam 2 scores have a mean of 20 and a standard deviation of 3. Assuming both types of scores have distributions that are unimodal and symmetric, which is more unusual: an exam 1 score of 790 or an exam 2 score of 28? A. The exam 2 score is more unusual. B. The exam 1 score is more unusual. C. They are the same. D. It cannot be determined which exam score is more unusual
number 10
A statistician wishes to determine the difference between two population means. A sample of 18 items from Population #1 yields a mean of 205 with a standard deviation of 12. The sample of 15 items from Population #2 yields a mean of 190 with a standard deviation of 10. Assume that the values are normally distributed in each population. How many degrees of freedom are there for this test? a. 18 b. 14 c.15 d. 17

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