PRACTICE!Identify the sampling method used in the following.1. The analyst needs a sample of size 50 from a population of 200. To do this, herandomly assigned numbers 1-200 to each element of the population then chose every 4th element tobe part of his sample.2. The students in senior high school are divided according to their strand, STEM,ABM, HUMSS, etc. The principal wants to do a study on the effectiveness of a certain medium ofinstruction. So, he randomly selected 5 students from each strand and administered the same exam tothe selected students.3. As part of the foundation day program, the school decided to give away 5computers to 5 lucky students. So, they held a raffle draw to select the winners.4. To verify the result of a recent election, the national board of canvassers randomlychose precincts and manually check and tally every ballot in those selected precincts.ENGAGEMENT:Determine whether the underlined numerical value is a parameter or a statistic. Write your answer onthe space provided.1. The average salary of all rank-and-file employees of a certain company is P15 500.2. In a recent study, the average height of 100 of the total 550 students is 150 cm.3. The average grade in Math by ten students at a certain school is 98.4. The average life span in the Philippines is 75 years old5. Sixty out of 100 contestants got an average score of 80.6. The lowest price of onion in a certain market is P45 per kilo.7. The average daily allowance of the selected 10 students of the class is P75.8. A recent survey of the Guidance and Counseling office indicated that the averagetravel time of 100 of its 1 000 students is 45 minutes.

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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...

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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 99% 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.) B- Assume that a prior survey suggests that about 38% of air passengers prefer an aisle seat. n = (Round up to the nearest integer.)
A vaccine to prevent a severe virus was given to children within the first year of life as part of a drug study. The study reported that of the 3456bchildren randomly assigned the vaccine, 58 got the virus. Of the 1606 children randomly assigned the placebo, 46 got the virus. a. Find the sample percentage of children who caught the virus in each group. Is the sample percentage lower for the vaccine group, as investigators hoped? b. Determine whether the vaccine is effective in reducing the chance of catching the virus, using a significance level of 0.01.The first few steps of the hypothesis-testing procedure are given. Complete the procedure.
Knowing that you need a sample pool of 536 students to ultimately get about 250 students in your sample, you are in position to draw a systematic sample from the student directory at your university. Further, 5,000 students are listed in the directory. What is the sampling interval?
Sony wants to administer a satisfaction survey to its current customers. Using their customer database, the company randomly selects 90 customers and asks them about their level of satisfaction with the company. What type of sampling is used? O A. Systematic O B. Stratified O C. Convenience O D. Simple random O E. Cluster
Using the same question from #3 A survey is done to find out the favorite movies of 500 children. The children are categorized into male and female, and a sample of 50 children is chosen. Answer the following question: If the number of female children is 300, what is the sample size of each stratum? a male sample: 40 and female sample: 10 b male sample; 25 and female sample: 25 c male sample: 30 and female sample: 20 d male sample: 20 and female sample: 30
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 5.5 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. (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 38% of air passengers prefer an aisle seat. (Round up to the nearest integer.)
Determine which Sample Type is used in the following scenarios. President Biden want to survey the nation about their incomes. He contacts the IRS and has them put everyone who filed taxes last year into a data base. He then groups tax filers based on their filing status, Single, Married filing separate, and married filing jointly. He then selects 5000 people from each group using a random generator to survey.
In 1942, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 440 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 418 indicated that they were total abstainers. Complete parts (a) and (b) below. (a) Determine the sample proportion for each sample. and respectively. The proportions of the adults who took the 1942 survey and the recent survey who were total abstainers are (Round to three decimal places as needed.)
A choral conductor has 1885 singers in her choir, some of them are professional singers. The conductor wants to estimate what percentage of singers are professional, but can't ask all 1885, so she instead asks 630 singers in front and finds 17 who are professionals. (a) Identify the sample.A. 17/1885B. 630C. singers who were askedD. None of the above. (b) Identify the populationA. percentage of entire singers who are professionalB. entire singersC. 17/1885D. None of the above. (c) What specific type of bias does this scenario demonstrate?A. Voluntary response samplingB. Convenience SamplingC. It is representative of the population.D. None of the above. (d) Identify the parameterA. range of values in which 95% values fallB. percentage of entire singers who are professionalC. 17D. None of the above.
To evaluate the current status of physical activity in university students at BU, a student in Business surveyed students from their class by randomly selecting 12 rows and collecting data one 2 people from each of the selected rows. The question asked: "How many hours per week do you exercise?" What is the sample? O Students in Business at BU. O The 24 surveyed students. O Students at BU Everyone at BU. ONone of the above.

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