Essentials of Statistics for The Behavioral Sciences
9th Edition
ISBN: 9781337573702
Author: Frederick J Gravetter, Larry B. Wallnau, Lori-Ann B. Forzano
Publisher: Cengage Learning
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Textbook Question
Chapter 4.1, Problem 3LC
For the following scores, which of the following actions will increase the
a. Add 4 points to the score X = 3
b. Add 4 points to the score X – 7
c. Add 4 points to the score X = 10
d. Add 4 points to the score X = 15.
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Question 3
The following stem-and-leaf displays the weekly salary of employees at this firm.
Stem-and-Leaf Display
Leaf Unit = 10.0
N=x
5
3 00123
12 4 0125888
(y)
5 11234456777
z
6 13568
5
7 154
2
8 46
i.
Determine the value of x, y and z.
[3]
ii. What is the value of the median?
[2]
iii.
Find the mode of this data set.
iv.
Calculate the range
[1]
[2]
Let Y be a continuous RV with PDF
otherwise
Find the CDF, Fry), of Y .
Find an expression for pth, p € (0, 1), quantile of the distribution.
Find E(Y) and V(Y).
Find E(-2Y + 1) and V(-3Y - 2).
Find E(Y3).
Let X be a continuous RV with CDF
Find P(X < 0), P(-1 < X < 1) and P(0.5 < X).
Based on your answers to the above questions, what is the median of the distribu-tion? Why
Find the PDF, fx (x), of X.
Chapter 4 Solutions
Essentials of Statistics for The Behavioral Sciences
Ch. 4.1 - Which of the following is a consequence of...Ch. 4.1 - What is the range for the following set of scores?...Ch. 4.1 - For the following scores, which of the following...Ch. 4.2 - Which of the following sets of scores has the...Ch. 4.2 - What is the variance for the following set of...Ch. 4.2 - A set of scores ranges from a high of X = 24 to a...Ch. 4.3 - What is SS, the sum of the squared deviations, for...Ch. 4.3 - What is the standard deviation for the following...Ch. 4.3 - Prob. 3LCCh. 4.4 - Which of the following explains why it is...
Ch. 4.4 - Under what circumstances is the computational...Ch. 4.4 - Prob. 3LCCh. 4.5 - A researcher takes a sample from a population and...Ch. 4.5 - A researcher takes all of the possible samples of...Ch. 4.5 - All the possible samples of n = 3 scores are...Ch. 4.6 - If a normal-shaped population with y. 40 and o 5...Ch. 4.6 - If 5 points are added to every score in a...Ch. 4.6 - A research study obtains a mean of 12.7 and a...Ch. 4.6 - For which of the following distributions would X =...Ch. 4 - Briefly explain the goal for defining and...Ch. 4 - What is the range for the following set of scores?...Ch. 4 - In words, explain what is measured by variance and...Ch. 4 - Is it possible to obtain a negative value for...Ch. 4 - Describe the scores in a sample that has a...Ch. 4 - There are two different formulas or methods that...Ch. 4 - Calculate the mean and SS (sum of squared...Ch. 4 - For the following population of N = 9 scores: 4,...Ch. 4 - Calculate SS, variance, and standard deviation for...Ch. 4 - Calculate SS. variance, and standard deviation for...Ch. 4 - Calculate SS. variance, and standard deviation for...Ch. 4 - For the following set of scores; 6, 2, 3, 0, 4 a....Ch. 4 - Explain why the formula for sample variance is...Ch. 4 - For the following sample or n = 6 scores: 0, 11,...Ch. 4 - Calculate SS, variance, and standard deviation for...Ch. 4 - Calculate SS, variance, and standard deviation for...Ch. 4 - A population has a mean of = 50 and a standard...Ch. 4 - Solve the following problems. a. After 6 points...Ch. 4 - Compute the mean and standard deviation for the...Ch. 4 - For the following sample of n = 8 scores: 0, 1,12,...Ch. 4 - For the following population of N = 6 scores: 2,...Ch. 4 - The range is completely determined by the two...Ch. 4 - For the data in the following sample: 1, 1, 9, 1...Ch. 4 - Arden and Plomin (2006) published a study...Ch. 4 - A population has a mean of = 50 and a standard...Ch. 4 - On an exam with a mean of M = 39, you obtain a...
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- A survey of 581 citizens found that 313 of them favor a new bill introduced by the city. We want to find a 95% confidence interval for the true proportion of the population who favor the bill. What is the lower limit of the interval? Enter the result as a decimal rounded to 3 decimal digits. Your Answer:arrow_forwardLet X be a continuous RV with PDF where a > 0 and 0 > 0 are parameters. verify that f-∞ /x (x)dx = 1. Find the CDF, Fx (7), of X.arrow_forward6. [20] Let X be a continuous RV with PDF 2(1), 1≤x≤2 fx(x) = 0, otherwisearrow_forward
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