Statistics For The Behavioral And Social Sciences: A Brief Course, Books A La Carte (6th Edition) (what's New In Psychology)
6th Edition
ISBN: 9780205989065
Author: Arthur Aron Ph.D., Elliot J. Coups Ph.d., Elaine N. Aron Ph.D.
Publisher: PEARSON
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Chapter 6, Problem 5.6HD
(a)
To determine
Mention the conclusion about effect size for a significant result if the study had a very large
(b)
To determine
Mention the conclusion about effect size for a significant result if the study had a very small sample size.
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3. [15] The joint PDF of RVS X and Y is given by
fx.x(x,y) = {
x) = { c(x +
{
c(x+y³),
0,
0≤x≤ 1,0≤ y ≤1
otherwise
where c is a constant.
(a) Find the value of c.
(b) Find P(0 ≤ X ≤,
Need help please
7. [10] Suppose that Xi, i = 1,..., 5, are independent normal random variables, where
X1, X2 and X3 have the same distribution N(1, 2) and X4 and X5 have the same
distribution N(-1, 1). Let
(a) Find V(X5 - X3).
1
= √(x1 + x2) — — (Xx3 + x4 + X5).
(b) Find the distribution of Y.
(c) Find Cov(X2 - X1, Y).
-
Chapter 6 Solutions
Statistics For The Behavioral And Social Sciences: A Brief Course, Books A La Carte (6th Edition) (what's New In Psychology)
Ch. 6 - Prob. 1.1HDCh. 6 - (a) What is a Type I error? (b) Why is it...Ch. 6 - (a) What is a Type II error? (b) Why is it...Ch. 6 - If you set a lenient alpha level (say .25), what...Ch. 6 - If you set an extreme alpha level (say .001), what...Ch. 6 - What does effect size add to just knowing whether...Ch. 6 - Why do researchers usually use a standardized...Ch. 6 - Write the formula for effect size in the situation...Ch. 6 - On a standard test, the population is known to...Ch. 6 - (a) Why are effect size conventions useful? (b)...
Ch. 6 - Prob. 2.6HDCh. 6 - Prob. 3.1HDCh. 6 - Prob. 3.2HDCh. 6 - Prob. 3.3HDCh. 6 - Name three approaches that researchers typically...Ch. 6 - Prob. 4.1HDCh. 6 - Prob. 4.2HDCh. 6 - Prob. 4.3HDCh. 6 - Prob. 4.4HDCh. 6 - Prob. 4.5HDCh. 6 - Prob. 5.1HDCh. 6 - Prob. 5.2HDCh. 6 - Prob. 5.3HDCh. 6 - Prob. 5.4HDCh. 6 - Prob. 5.5HDCh. 6 - Prob. 5.6HDCh. 6 - When a result is not significant, what can you...Ch. 6 - Prob. 6.1HDCh. 6 - Define alpha and beta.
Ch. 6 - For each of the following studies, make a chart of...Ch. 6 - In a completed study, there is a known population...Ch. 6 - In a planned study, there is a known population...Ch. 6 - Prob. 5PPCh. 6 - Here is information about several possible...Ch. 6 - You read a study in which the result is...Ch. 6 - Prob. 8PPCh. 6 - How does each of the following affect the power of...Ch. 6 - Prob. 10PPCh. 6 - For each of the following studies, make a chart of...Ch. 6 - In a completed study, there is a known population...Ch. 6 - In a planned study, there is a known population...Ch. 6 - In a planned study, there is a known population...Ch. 6 - Here is information about several possible...Ch. 6 -
You read a study that just barely fails to be...Ch. 6 -
19. In the Decision Errors, Effect Size, and...Ch. 6 -
Caspi and colleagues (1997) analyzed results from...Ch. 6 -
Tsang and colleagues (2009) conducted a review to...Ch. 6 - You are planning a study that you compute as...
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- 1. [10] Suppose that X ~N(-2, 4). Let Y = 3X-1. (a) Find the distribution of Y. Show your work. (b) Find P(-8< Y < 15) by using the CDF, (2), of the standard normal distribu- tion. (c) Find the 0.05th right-tail percentage point (i.e., the 0.95th quantile) of the distri- bution of Y.arrow_forward6. [10] Let X, Y and Z be random variables. Suppose that E(X) = E(Y) = 1, E(Z) = 2, V(X) = 1, V(Y) = V(Z) = 4, Cov(X,Y) = -1, Cov(X, Z) = 0.5, and Cov(Y, Z) = -2. 2 (a) Find V(XY+2Z). (b) Find Cov(-x+2Y+Z, -Y-2Z).arrow_forward1. [10] Suppose that X ~N(-2, 4). Let Y = 3X-1. (a) Find the distribution of Y. Show your work. (b) Find P(-8< Y < 15) by using the CDF, (2), of the standard normal distribu- tion. (c) Find the 0.05th right-tail percentage point (i.e., the 0.95th quantile) of the distri- bution of Y.arrow_forward
- == 4. [10] Let X be a RV. Suppose that E[X(X-1)] = 3 and E(X) = 2. (a) Find E[(4-2X)²]. (b) Find V(-3x+1).arrow_forward2. [15] Let X and Y be two discrete RVs whose joint PMF is given by the following table: y Px,y(x, y) -1 1 3 0 0.1 0.04 0.02 I 2 0.08 0.2 0.06 4 0.06 0.14 0.30 (a) Find P(X ≥ 2, Y < 1). (b) Find P(X ≤Y - 1). (c) Find the marginal PMFs of X and Y. (d) Are X and Y independent? Explain (e) Find E(XY) and Cov(X, Y).arrow_forward32. Consider a normally distributed population with mean μ = 80 and standard deviation σ = 14. a. Construct the centerline and the upper and lower control limits for the chart if samples of size 5 are used. b. Repeat the analysis with samples of size 10. 2080 101 c. Discuss the effect of the sample size on the control limits.arrow_forward
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- Suppose the random variable X is normally distributed with mean 80 and standard deviation 16. Find following probabilities. Find ‘b’ such that P(X ≥ b) = 0.975. Find the probability using a normal distribution table AND using ti-83 calculator. SHOW ALL STEPS PLEASE.arrow_forwardSuppose the random variable X is normally distributed with mean 80 and standard deviation 16. Find following probabilities. Equation: P(85 ≤ X ≤ 102). Find the probability using a normal distribution table AND using ti-83 calculator. SHOW ALL STEPS PLEASE.arrow_forwardData set is Bachelor Degree's Conferred by Race and Ethnicity.arrow_forward
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