1. Assignment for Chapter 6 (Probability) A first-grade class consists of 9 boys and 14 girls. If the teacher selects names from the class list using random sampling: a. b. What is the probability that the first student selected will be a boy? If a random sample of n = 5 students is selected and the first four selected are girls, what is the probability that the fifth student selected will be a girl? Find each of the following probabilities for a normal distribution. 2. a. p(z > 1.20) b. p(z > -0.70) C. p(z <0.85) d. p(z < -1.30) 3. A normal distribution has a mean of μ = 50 and a standard deviation of σ = 10. For each of the following scores, indicate whether the tail is to the right or left of the score and find the proportion of the distribution located in the tail. a. X = 40 b. X = 48 C. X = 65 d. X = 70 4. Assume that the average American consumer consumes 150 mg of caffeine daily. Assuming that the distribution is approximately normal with a standard deviation of σ = 75, find each of the following values. What percent of people consume more than 200 mg of caffeine a day? a. b. What percent of people consume more than 100 mg of caffeine a day? C. How much daily caffeine intake corresponds to the top 5% of the population? 5. A city averages u = 35 inches of annual precipitation. Assume that the distribution of precipitation amounts is approximately normal with a standard deviation of σ = 10 inches. For each of the following, report the z-score and state whether it represents a fairly typical year, an extremely wet year, or an extremely dry year. a. Annual precipitation of 37 inches. b. Annual precipitation of 15 inches.
1. Assignment for Chapter 6 (Probability) A first-grade class consists of 9 boys and 14 girls. If the teacher selects names from the class list using random sampling: a. b. What is the probability that the first student selected will be a boy? If a random sample of n = 5 students is selected and the first four selected are girls, what is the probability that the fifth student selected will be a girl? Find each of the following probabilities for a normal distribution. 2. a. p(z > 1.20) b. p(z > -0.70) C. p(z <0.85) d. p(z < -1.30) 3. A normal distribution has a mean of μ = 50 and a standard deviation of σ = 10. For each of the following scores, indicate whether the tail is to the right or left of the score and find the proportion of the distribution located in the tail. a. X = 40 b. X = 48 C. X = 65 d. X = 70 4. Assume that the average American consumer consumes 150 mg of caffeine daily. Assuming that the distribution is approximately normal with a standard deviation of σ = 75, find each of the following values. What percent of people consume more than 200 mg of caffeine a day? a. b. What percent of people consume more than 100 mg of caffeine a day? C. How much daily caffeine intake corresponds to the top 5% of the population? 5. A city averages u = 35 inches of annual precipitation. Assume that the distribution of precipitation amounts is approximately normal with a standard deviation of σ = 10 inches. For each of the following, report the z-score and state whether it represents a fairly typical year, an extremely wet year, or an extremely dry year. a. Annual precipitation of 37 inches. b. Annual precipitation of 15 inches.
Ciccarelli: Psychology_5 (5th Edition)
5th Edition
ISBN:9780134477961
Author:Saundra K. Ciccarelli, J. Noland White
Publisher:Saundra K. Ciccarelli, J. Noland White
Chapter1: The Science Of Psychology
Section: Chapter Questions
Problem 1TY
Related questions
Question
Uncertain how to solve
Transcribed Image Text:1.
Assignment for Chapter 6 (Probability)
A first-grade class consists of 9 boys and 14 girls. If the teacher selects names from the class list
using random sampling:
a.
b.
What is the probability that the first student selected will be a boy?
If a random sample of n = 5 students is selected and the first four selected are girls,
what is the probability that the fifth student selected will be a girl?
Find each of the following probabilities for a normal distribution.
2.
a.
p(z > 1.20)
b.
p(z > -0.70)
C.
p(z <0.85)
d.
p(z < -1.30)
3.
A normal distribution has a mean of μ = 50 and a standard deviation of σ = 10. For each of the
following scores, indicate whether the tail is to the right or left of the score and find the
proportion of the distribution located in the tail.
a.
X = 40
b.
X = 48
C.
X = 65
d.
X = 70
4.
Assume that the average American consumer consumes 150 mg of caffeine daily. Assuming that
the distribution is approximately normal with a standard deviation of σ = 75, find each of the
following values.
What percent of people consume more than 200 mg of caffeine a day?
a.
b.
What percent of people consume more than 100 mg of caffeine a day?
C.
How much daily caffeine intake corresponds to the top 5% of the population?
5.
A city averages u = 35 inches of annual precipitation. Assume that the distribution of
precipitation amounts is approximately normal with a standard deviation of σ = 10 inches. For
each of the following, report the z-score and state whether it represents a fairly typical year, an
extremely wet year, or an extremely dry year.
a.
Annual precipitation of 37 inches.
b.
Annual precipitation of 15 inches.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 5 images
Recommended textbooks for you
Ciccarelli: Psychology_5 (5th Edition)
Psychology
ISBN:
9780134477961
Author:
Saundra K. Ciccarelli, J. Noland White
Publisher:
PEARSON
Cognitive Psychology
Psychology
ISBN:
9781337408271
Author:
Goldstein, E. Bruce.
Publisher:
Cengage Learning,
Introduction to Psychology: Gateways to Mind and …
Psychology
ISBN:
9781337565691
Author:
Dennis Coon, John O. Mitterer, Tanya S. Martini
Publisher:
Cengage Learning
Ciccarelli: Psychology_5 (5th Edition)
Psychology
ISBN:
9780134477961
Author:
Saundra K. Ciccarelli, J. Noland White
Publisher:
PEARSON
Cognitive Psychology
Psychology
ISBN:
9781337408271
Author:
Goldstein, E. Bruce.
Publisher:
Cengage Learning,
Introduction to Psychology: Gateways to Mind and …
Psychology
ISBN:
9781337565691
Author:
Dennis Coon, John O. Mitterer, Tanya S. Martini
Publisher:
Cengage Learning
Psychology in Your Life (Second Edition)
Psychology
ISBN:
9780393265156
Author:
Sarah Grison, Michael Gazzaniga
Publisher:
W. W. Norton & Company
Cognitive Psychology: Connecting Mind, Research a…
Psychology
ISBN:
9781285763880
Author:
E. Bruce Goldstein
Publisher:
Cengage Learning
Theories of Personality (MindTap Course List)
Psychology
ISBN:
9781305652958
Author:
Duane P. Schultz, Sydney Ellen Schultz
Publisher:
Cengage Learning