just do part b) and part c) (a) Write down the name of the sampling method for each of the following cases:(i) Every 30th product in the production line is selected for quality control.(ii) Fair representatives of staffs are selected randomly from different departments to conduct a surveyabout the gender distribution.(iii) Students are selected based on random numbers to take place in a survey about their favoritesubjects.(b) In a restaurant, the spending of a customer for lunch is known to follow a normal distribution withpopulation mean of $80 and population standard deviation of $15. Suppose each customer will get a10% off discount today. Find the median of customer spending for lunch in the restaurant after thediscount.(c) Mary is doing some research about the number of hours spent on social media per week by primaryschool kids and secondary school kids. She reads a report that mentions the standard deviation of timespent on social media by primary school kids is 2.6 hours. In another report it mentions that the varianceof time spent on social media by secondary school kids is 4.84 hours?. Which group of students, primaryschool kids or secondary school kids, has a greater variation in terms of number of hours spent on socialmedia per week?

here use basic of normal distribution and definition of variation

Answered: (b) In a restaurant, the spending of a…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 2E

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Similar questions

What is meant by the sample space of an experiment?
Identify the type of sampling technique used by the researcher in each of the following situations. 1. A teacher conducted a study in her school to determine who were better in Mathematics : the boys or the girls. 2. A researcher who is conducting a research on the effects of using calculators in teaching mathematics decided to divide her students into male and female and then selected students from each gender group.
Identify the type of sampling technique used by the researcher in each of the following situations. 1. A researcher interviewed all top 10 Grade 11 students in each of 15 randomly selected private schools in Metro Manila. 2. A teacher asked her students to fall in line. He instructed one of them to select every 5th student on the line 3. A statistician selected a sample of n = 100 high school students from a private school with 2,500 students. He selected randomly the students from each grade level.
An economist is studying the effect of education on salary and conducts a survey of 150 randomly selected workers from each of these categories: less than a high-school degree; high-school degree; more than a high-school degree. The sampling technique being employed is:
A transportation researcher is funded to estimate the proportion of automobile tires with an unsafe tread thickness in a small northern state. The researcher randomly selects one month during each of the four seasons for taking the measurements. During each of the four selected months, the researcher randomly selects 500 cars from the list of registered cars in the state and then measures the tread thickness of the four tires on each of the selected cars. What is the population of interest? What is the sampling frame? What biases if any may result from using the data from this study to obtain the estimated proportion of cars with an unsafe thread thickness?
When a researcher uses random sampling in their study, they are most likely concerned with: When a researcher uses random sampling in their study, they are most likely concerned with: a.Increasing the internal validity of the study by creating a representative sample. b. Increasing the external validity of the study by creating a representative sample. c. Increasing the external validity of the study by reducing the potential for confounding variables. d. Increasing the internal validity of the study by reducing the potential for confounding variables.
Identify the sampling techniques used, and discuss potential sources of bias (if any). Explain. Every tenth person entering a sporting goods store is asked to choose his or her favorite sport from a list of five different sports that includes a description of each. What type of sampling is used? A. Stratified sampling is used, because the population is divided into groups, and random samples are taken from each group. B. Cluster sampling is used, because the population is divided into groups, several groups are selected, and every person in those groups is contacted. C. Systematic sampling is used, because every tenth person is selected. D. Convenience sampling is used, because the researchers contact the easiest people to reach. E. Simple random sampling is used, because every sample of a given size has an equal chance of being selected. What potential sources of bias are present, if any? Select all that apply. A. The…
A quality control specialist took a 20-sized random sample from a 100-sized batch and analyzed it and adopted a double-tier sampling scheme as follows: If all units in the studied sample are accurate, the batch will be accepted. If the total number of defects in the sample is more than 2, the party will be rejected. If the number of defects in the analyzed sample is 1 or 2, the goods from the first sample are removed from the lot without returning them back to the lot.A second sample with a size of 15 is chosen. If the total number of defects in the first and second samples examined is 2 or less than 2, the party will be accepted, in the other case the party will be rejected. Using the hypergeometric distribution for acceptable quality level (AQL) 0.05 according to the given double-layer sampling plan; a. Find the probability that the batch is rejected after the first sample.b. Calculate the producer risk.
give answer to the following questions (a) In what situations the cluster sampling be preferred? Explain with suitable example. Which sampling design is used to select clusters from a population? 2(b) A population is divided into several clusters and it has been found that all the items within a cluster are alike. Which of the sampling procedure would you adopt? Give appropriate reasons for selecting such method.
What kind of sampling design is used in each of following cases? A large company surveys 100 employees by taking 2 random samples of the 10 managers and 18 samples of the 90 non-managerial employees. A concert venue offers tickets in 3 zones: orchestra, grand tier, and balcony. Tickets in the orchestra zone are most expensive, and tickets in the balcony zone are least expensive. Managers of the venue want to survey approximately 150 guests at an upcoming concert about their overall experience. They randomly select 50 tickets from each zone and invite those guests to participate in the survey. The police set up checkpoints at randomly selected road locations, then inspect every driver at those locations. The service manager at a car dealership inspects every fifth car to make sure that cars are detailed after being serviced
Of what relevance is the central limit theorem to the sampling distribution of the sample means?
Why is it necessary for a sample to be obtained randomly rather than conveniently?

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