A lecturer wants to take a sample of 40 students from a class of 160 to complete a survey on the module. In the past they have tried three ways: asking the first 40 students who turn up to lectures, emailing a survey to the entire class, and hope 40 respond or ask each student in lecture to toss a coin twice and select the students who get two heads. Which approach would you prefer and why, or does it matter?

Q: Four students achieve the following grades on their midterm which was out of 20 marks: 4, 4, 4, 20.…

A: The mode is 4 as its is the highest occurring frequency. So it will reflect the accuracy or more…

Q: A survey was given to a group of 10,000 students to determine whether they wanted an outdoor…

A: The union of events A and B is defined as n(A ∪ B) = n(A)  + n(B) – n(A ∩ B).

Q: A company is planning a Christmas party for their 750 employees, base on the survey responses they…

A: Given a company is planning a Christmas party for their 750 employees, base on the survey responses…

Q: From a group of 16 women and 17 men, a researcher wants to randomly select 8 women and 8 men for a…

A:

Q: .On a particularly boring transatlantic flight, one of the passengers amused himself by counting the…

A: let B: black haired Let W :  whole row n(B ∪ W) = 37n(B) =33n(W) = 6

Q: The guidance department has reported that of the senior class, 2.3% are members of Key Club, K, 8.6%…

A: Solve

Q: In a math 105 class of 32 students, a survey showed that 20 students used the ALEKS etext at least…

A:

Q: In your school, 40% of students watch TV at night. You randomly ask 5 students every day if they…

A:

Q: You are one of the participants in an upcoming interactive quiz game that consists of multiple…

A:

Q: When taking a 5 question multiple choice test, where each question has 4 possible answers, it would…

A: Given that, Number of questions in multiple choice test n=5 Probability of getting correct answer…

Q: Sally is interested in finding out if the political party affiliation of Americans who are…

A: Given that P(Democrats)=29.5%=0.295 P(Republicans)=24.6%=0.246 P(other political…

Q: The finishing times of the Men, Ages 30 - 34 group has a mean of 4313 seconds with a standard…

A: We have given that  Friends Leo and Mary both completed the Hermosa Beach Triathlon, where Leo…

Q: Your friend hides a dollar bill under one of three plastic cups. Under the other two cups is a paper…

A: Here we should find the probability if we have to switch to the other cup. Please find the solution…

Q: In triathlons, it is common for racers to be placed into age and gender groups. Friends Leo and Mary…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: What is the Z-Score for Leo's finishing time? Round to two decimal places.

A: Here, Leo completed the race in 4948 seconds,    while Mary completed the race in 5513 seconds. The…

Q: Kenneth is the Chairman of the Resident's Committee of his constituency. He wishes to find out if…

A: The process of extracting sample from the population is called a sample. The sample is the…

Q: With the rise of online shopping and the incoming 11.11 sale of Lazada and Shopee, you also set up a…

A: Given that: If a number 1 comes up, the customer wins Php500. If the number 2 comes up, the customer…

Q: A survey of a sample of 25 new cars being sold in a car store was conducted to understand which of…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: For test taking, do you retain information better writing it down with paper and pen or typing on a…

A: There are 2 groups of students. The students are given a crash course to study. One group have to…

Q: Lee is a teacher at a local high school who wanted to assess whether or not dogs physically resemble…

A: Given,  n = 16 H0: p = 0.50 Ha: P>0.50 (right tailed test)

Q: The life spans of three randomly selected tires are 34,000 miles, 36,000 miles, and 31,000 miles.…

A: Here, we are going to use z score and emphirical values to find out the values that are usual or…

Q: Sally is interested in finding out if the political party affiliation of Americans who are…

A: Given that, among all Americans who are registered to vote, 31.7% are registered Democrats and 27.6%…

Q: A personal trainer thinks her clients get better workouts and are stronger if they listen to music…

A: Concept: Hypothesis testing is the process of testing the claim being made about population

Q: In a math 105 class of 32 students, a survey showed that 20 students used the ALEKS etext at least…

A: Given,no.of students used ALEKS etext at least once=20no.of students used video at least…

Q: Mars, a candy company, makes six different classic colors of M&M's. According to the company's…

A:

Q: When taking a 8 question multiple choice test, where each question has 4 possible answers, it would…

A: When taking a 8 question multiple choice test, each question has 4 possible answers. Mean and…

Q: Raaj works at the customer service call center of a major credit card bank. Cardholders call for a…

A:

Q: A professor wanted to determine whether an online homework system improved scores on a final exam.…

A:

Q: In her last semester at SPC, Polly Hedron needs to take Statistics, Composition 2, and Ethics.…

A: Given ,  In her last semester at SPC, Polly Hedron needs to take Statistics, Composition 2, and…

Q: The intention is to form a committee consisting of 5 persons from BIM, a group of engineers and…

A: There are 10 engineers and 4 technicians. Thus, total number of individuals in the population is, n…

Q: You have a pop quiz for which you haven't studied. The multiple choice quiz has 10 questions and 3…

A: Introduction to binomial distribution: Consider a random experiment involving n independent trials,…

Q: The following day 5 more coffee samples are given to choose from. Customers are told that they can…

A:

Q: A landscaper wants to find the answer to the question "How much time do people in Raleigh, North…

A: To find which of the following option is best describe the accuracy of the result of the survey.

Q: A politician running for Senate in California claims that only 34% of Californians approve of the…

A: Concept of sampling distribution of sample proportion: Let a particular characteristic of a…

Q: In her last semester at SPC, Polly Hedron needs to take Statistics, Composition 2, and Ethics.…

A: Given that she has 13 choices for her section of Statistics, 15 choices for her section of…

Q: The complement of 4 heads in the toss of 4 coins is At least one tail, Why it cannot be "all…

A: This can be understood as the rule of hypothesis. In which the alternative hypothesis is the…

Q: You are one of the participants in an upcoming interactive quiz game that consists of multiple…

A: Suppose the combination have x correct multiple choice questions and y correct fill-in-the-blank…

Q: When taking a 8 question multiple choice test, where each question has 4 possible answers, it would…

A: Mean and standard deviation:The mean and standard deviations are calculated as follows:

Q: Maria and John have decided that once they live in a house, they want to have a pet. They go to an…

A: Given that there are total 22 dogs.  They want to select 2 dogs.  So the number of combinations of 2…

Q: a) You are one of a team assigned to find the best locations for bus stops between North Amman bus…

A:

Q: assume the test had 6 true-false questions and 8 multiple-choice questions, and that each…

A: There are 6 True-False questions.  So, each of these has 2 possible answers, so there are 26…

Q: A college biology teacher wants to know whether being tutored at the study lab will help her…

A: Here teacher wants to know whether being tutored at the study lab will her students for scoring high…

Q: A company has 12 male and 11 female employees, and needs to nominate 2 men and 2 women for the…

A: A company has 12 male and 11 female employees. company needs to nominate 2 men and 2 women for the…

Q: For this problem, assume the test had 8 true-false questions and 10 multiple-choice questions, and…

A: Given that there are 8 true or false questions and 10 multiple choice question and each multiple…

Q: Dr. Volz gave an exam with 14 questions, but students only had to answer 10 of them. Suppose the…

A: We have to use combination formula. Formula : Crn = n!r!(n-r)!

Q: Mr. Bennett, the owner of two car dealerships in Manchester, is holding a contest to see whic one…

A: Given, Mr. Bennett is the owner of two car dealerships in Manchester.  Manchester cars already(at…

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.