Directions: Identify which type of sampling is used: random, stratified random, cluster, systematic, or convenience. _____________________1. A psychologist selects 5 boys and 5 girls from each of Special Science classes. _____________________2. When he made an important announcement, he based conclusion on 5,000 responses from 50,000 questionnaires to students. _____________________3. The game show organizer writes the name of each contestant on a separate card, shuffles the cards, and draws 6 names. _____________________4. Globe selects every 50th cellphone from the assembly line an conduct a thorough test of quality

Directions: Identify which type of sampling is used: random, stratified random, cluster, systematic, or convenience. ___________1. A psychologist selects 5 boys and 5 girls from each of Special Science classes. _2. When he made an important announcement, he based conclusion on 5,000 responses from 50,000 questionnaires to students. _3. The game show organizer writes the name of each contestant on a separate card, shuffles the cards, and draws 6 names. ___________4. Globe selects every 50th cellphone from the assembly line an conduct a thorough test of quality

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Similar questions

creat a sample distribution for the sample mean from the following population if we take sample sizes of three population: 40,45,50,55,60 note: there are 10 possible samples of size 3
Inferential statistics is so named because it allows us to examine a sample and make inferences about ____________________ A. another sample.B. an element of the sample.C. the population from which the sample was taken.D. none of the above.
You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume you want to be 90% confident that the sample percentage is within 2.5 percentage points of the true population percentage. Completed parts a and b below. A.) assume that nothing is known about the percentage of passengers who prefer aisle seats. N= ____ (round up to the nearest integer) B.) assume that a prior survey suggest that about 35% of air passengers prefer an aisle seat. N=____ (round up to the nearest integer)
Complete parts (a) through (e) for the population data below. 2, 4, 6 d. For each of the possible sample sizes, find the probability that the sample mean will equal the population mean. n Probability 1 1 3 2 3 3 1 (Type integers or simplified fractions.) e. For each of the possible sample sizes, find the probability that the sampling error made in estimating the population mean by the sample mean will be 0.5 or less (in magnitude), that is, that the absolute value of the difference between the sample mean and the population mean is at most 0.5. n 1 2 3 Probability (Type integers or simplified fractions.)
After 120 rolls of the die the following data was produced. What test would you use to determine whether the die is fair or not. Face Value 1 2 3 4 5 6 Occurances 20 19 21 30 10 20 Name of Test _____________________________________________
Tq
In looking at the results of a standardized exam, 72% of those taking the test choose the correct answer on the first question. Answer the following for 400 test takers who are to be randomly chosen. After taking the sample and administering the test, 320 of the test takers answer the first question correctly. The sample proportion is ____________________. Find the mean and variance for the distribution of sample proportions from samples of size n = 400. Mean: __________________ Variance: ___________________ The probability is ____________________ for taking another random sample of size n = 400 test takers and more than 75% of them getting the correct answer on this question.
You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 90% confident that the sample percentage is within 1.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. n= (Round up to the nearest integer.) nter corr
part a and b
7
- Attendance and Grades Read the following on attendance and grades, and answer the questions in the discussion board. A study conducted at Manatee Community College revealed that students who attended class 95 to 100% of the time usually received an A in the class. Students who attended class 80 to 90% of the time usually received a B or C in the class. Students who attended class less than 80% of the time usually received a D or an F or eventually withdrew from the class. Based on this information, attendance and grades are related. The more you attend class, the more likely you will receive a higher grade. If you improve your attendance, your grades will probably improve. Many factors affect your grade in a course. One factor that you have considerable control over is attendance. You can increase your opportunities for learning by attending class more often. a. What are the variables under study? b. Are descriptive, inferential, or both types of statistics used? c. What is the…
i need the answer quickly