If each sample from a large number of samples has the same probability of being selected then it is called: a. cluster sampling O b. Simple random sampling O c. purposive sampling O d. non-random sampling
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- Sample spaces For each of the following, list the samplespace and tell whether you think the events are equallylikely:a) Roll two dice; record the sum of the numbers.b) A family has 3 children; record each child’s sex inorder of birth. c) Toss four coins; record the number of tails.d) Toss a coin 10 times; record the length of the longestrun of heads.2. A manufacturer of window frames knows from past experience that 10 per cent of theproduction will have some type of minor defect that will require adjustment. Suppose 20window frames are selected at random:a. How many window frames would you expect to have minor defects?3)
- 4for an acceptance sampling plan with n = 25 and c = 0, find the probability of acceptinga lot that has a defect rate of 2%. what is the probability of accepting the lot if the defectrate is 6%?First-semester GPAs for a random selection of freshmen at a large university are shown: 1.9 3.2 2.8 3.0 2.5 2.7 3.1 2.7 2.0 2.8 2.1 2.4 2.0 2.9 3.8 2.7 2.8 3.2 3.5 3.8 1.9 4.0 3.0 3.4 2.7 3.3 2.0 1.9 3.0 3.8 3.9 2.7 2.2 2.8 2.9 2.1 (Assume population standard deviation = 0.62) Answer the following questions: a) Which is the sample size? b) Which is the standard error of the sample means? c) Which is the best point estimate of the mean? d) Which is the lower limit of the 95% confidence interval of the mean number of jobs? e) Which is the upper limit of the 95% confidence interval of the mean number of jobs? f) Which is the margin of error of the 95% confidence interval? B) Which is the lower limit of the 99% confidence interval of the mean number of jobs? h) Which is the upper limit of the 99% confidence interval of the mean number of jobs? 1) Which is the margin of error of the 99% confidence interval? 1) Which is the sample standard deviation? a b C d e f g h i…
- When the Bureau of Labor Statistics conducts a survey, it begins by partitioning the United States adult population into 2,0072,007 groups called primary sampling units. Assume that these primary sampling units all contain the same number of adults. If you randomly select one adult from each primary sampling unit, is the result a simple random sample. Why or why not?If groups of participants are selected to represent sub-groups in the population (e.g. such as selecting an entire class of Social Work students to be compared to a group of Sociology students), this is known as Select one: a. Cluster sampling. b. Haphazard sampling. c. Simple random sampling. d. Opportunity sampling.Five state officials are listed to the right. Lieutenant Governor (L) Secretary of State (S) Attorney General (A) Representative (R) Press Secretary (P) a. List the 10 possible samples (without replacement) of size 3 that can be obtained from the population of five officials. b. If a simple random sampling procedure is used to obtain a sample of three officials, what are the chances that it is the first sample on your list in part (a)? the second sample? the tenth sample? a. List all 10 possible samples (without replacement) of size 3. Use the letter abbreviation for each official. (Use a comma to separate answers as needed.) b. What is the chance that the first sample in your list is selected? Type an exact answer.) What is the chance that the second sample in your list is selected? Type an exact answer.) What is the chance that the tenth sample in your list is selected? (1)
- Identify the sampling method (simple random sampling, systematic sampling, convenience sampling, or stratified sampling) in the following studies a. You split the population into faculty and students and then choose a random sample from each. b. You assign each member of the population a number and choose the sample using a computer program that randomly picks numbers. c. You ask every 3rd person who walks into the store to complete a survey.1. Trixy is doing her experiment for her project. The experiment consists of counting the number of times that it rains and recording in inches the total rainfall next August in Boston, Massachusetts. Is this a random experiment? If so, find the sample space.The government of a large city needs to determine whether the city's residents will support the repair of several roads. The government decides to conduct a survey of a sample of the city's residents. Which one of the following procedures would be the most appropriate for obtaining a sample of the city's residents? O Survey a random sample of the residents who use public transportation. O Survey every tenth person to use the public restroom. O Survey the last 100 residents listed in the telephone directory. O Survey a random sample of persons within each neighborhood. C