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?

Q: If a hurricane was headed your way, would you evacuate? The headline of a press release states,…

A: Sample size = n = 4625 Sample proportion = p̂ = 0.32

Q: nple of size 9, degrees of freedom is equal to

A: The degrees of freedom can be calculated as:  DF = n-1 Here, n = sample size

Q: entering your work cafeteria and are approached by an individual to participate in their study by…

A: Given that  You are entering your work cafeteria and are approached by an individual to participate…

Q: 1. N = 10, 000 and e = 1% %3D 2. N = 15, 000 and e = 5% 3. N = 30, 000 and e = 10% %3D

A: Given : N : Population size e : Margin of error 1. N = 10,000 and e = 1% = 0.01 2. N = 15,000 and e…

Q: The drinking water supplies in an area were tested for levels of chloramine and reported the average…

A: Solution: Let X be the chloramine concentration. The given data is 2.80, 3.57, 4.08, 4.13, 3.77,…

Q: Consider the following: at Bernhardt College, 200 (of the 3,000) students were polled and asked how…

A: From the given information, At Bernhardt College, 200 (of the 3,000) students were polled and asked…

Q: Assuming a sample size of​ 1,000 for this​ poll, construct a 90​% confidence interval for the true…

A: It is given that Sample size n = 1000 Sample proportion = 0.62 The critical value of z at 90%…

Q: Find the required sample size, n, if c=0.89, E=0.05, and  is unknown.

A: Solution: Given, c=0.89 E=0.05 Proportion is unknown. The critical value for zα/2 =1.598 using Excel…

Q: A vaccine to prevent a severe virus was given to children within the first year of life as part of a…

A: a.It is given that x1=57, x2= 49, n1=3,294, n2= 1,648. .

Q: plants in his garden into 10 regions.  He counts the number of sunflowers produced in just one of…

A: We have given that,  Farmer Josh separates his sunflower plants in his garden into 10 regions.  He…

Q: Part i) The proportion of the 126 people who are living below the poverty line, 25/126, is a: A.…

A: Here given , A government official is in charge of allocating social programs throughout the city of…

Q: which is the best sampling method for qualitative research, with a target population of 30?

A: Introduction There are 2 types of sampling method: Probability sampling method Non-probability…

Q: Please do STEP 2 only. STEPS IN THE SAMPLING PROCESS: Define the population from which the sample…

A: 2. A pop. frame is a list of units in the target pop..

Q: Identify which type of sampling is used: random, systematic, convenience, stratified, or cluster. To…

A: Given that To determine the customer opinion of their check in service American airlines randomly…

Q: You are approached by the Department of Labour to conduct a study to determine women farmers’…

A: Given information: The investigator is specially interested to conduct a study to determine women…

Q: Consider the following sets of sample data: A: 136, 99, 118, 134, 120, 130, 131, 135, 115, 118, 118,…

A: Coefficient of Variation : It is a typical measure of variation, which measures the relative…

Q: Health insurance benefits vary by the size of the company (the Henry J. Kaiser Family Foundation…

A: a:For the given data, the chi-square test for association is appropriate.Null Hypothesis:H0: The…

Q: 4. Find the first quartile for the following data set:                               4, 8, 14, 5,…

A:

Q: Calculate the mode of the following sample data set: 8 10 7 14 53 22 5 5 5 22

A: Given data is 8,10,7,14,53,22,5,5,5,22

Q: Construct the sampling distribution of the sample mean for the following population and with the…

A:

Q: Online gamers are divided into different age groups. A random sample from each group is selected and…

A: From the given information we want to know method of sampling.

Q: A veterinary epidemiologist wishes to investigate the use of antibiotics on cattle farms in a city.…

A: 4 types of sampling 1: simple random sampling  * Random selection from population to make sample.…

Q: Why does this a situation call for a matched-pairs analysis?

A: Test is that whether there is difference between the measurements.

Q: In conducting a statistical study about the number of hours full-time students work at Miramar…

A:

Q: You are doing research on students and you are interested in looking at the differences among…

A: Given that, The collected 100 response from each class. i.e. 100 freshmen, 100 sophomores, 100…

Q: If the sample size is n=16 what is likely true about the shape of the population?

A: Solution:  Central limit theorem: The central limit theorem state that as the sample size increases…

Q: In 1945, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you…

A: Let, X1= number of abstainer in the previous test n1= total sample size of the past test p1^ =…

Q: During an examination of equal length of cloths, the following are the number of defects observed:…

A:

Q: In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests."…

A: Given information: Sample of 200 buses and find that 20 buses fail the safety inspection. Let us…

Q: A government official is in charge of allocating social programs throughout the city of Vancouver.…

A: Solution-: Let, X- Number of an annual income that is below the poverty line. Given: n=129,X=24 We…

Q: Find the characteristics of each sampling tests: Z test, T test, F test and Chi-square test…

A: Statistical inference is an essential tool for making conclusions about populations based on sample…

Q: 1950, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on…

A: In 1950, Total adults n1=1100                       x1=374 In recent year…

Q: ter screens were randomly selected from a large collection of computer screens in a company’s…

A: A sample is a part of the population, which is selected from the population and if the sample is…

Q: who live within 20 miles of the coast in high hurricane risk counties of eight southern states. In…

A: It is given that sample size (n) is 4,625 and p hat value is 1-0.32 = 0.68.

Q: According to the Federal Trade Commission report on consumer fraud and identity theft, 23% of all…

A: a) Statistic: The statistical measure that describes the features of the sample that is taken from…

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.