Toxic waste The Environmental Protection Agency took amap of a region near a former industrial waste dump andplaced a grid of 552 squares on it. They randomly selectedany 16 of those squares from which to collect soil samplesand checked each for evidence of toxic chemicals.a) What type of sampling did they use?b) Is there any sort of bias associated with this samplingprocedure?c) One researcher suggests that plots closer to the olddump site could contain more contaminants than thosefarther away. How could the sampling procedure beimproved to take this into account?

Q: 5. Find the minimum sample size n needed to estimate the population mean for the give ralues of c,…

A: a. Given information; c=0.90sd=6.8E=1 Significance level is α=1-c=1-0.90=0.10 From the standard…

Q: 1) A shopkeeper keeps a record of how many sales they make in a day. They record the number of sales…

A: Given information: Sales Frequency 0 6 1 8 2 12 3 2 4 6 5 2

Q: Discuss the method of drawing a systematic sample of size 4 when N=24

A: Given - Pop. size = N = 24 Sample size = n = 4

Q: 4. Thirty Asian Utility vehicles were tested for biodiesel fuel efficiency (in km/liter). The…

A: For the given data Find ( a ) Variance =? s.d =? (b) p50 =? (c ) p75 = ?

Q: 1) Which sample has more variability? Explain a) 1, 3, 6, 13, 14, 21 b) 1, 4, 7, 12, 13, 21

A: The mean is computed as follows:The standard deviation is computed as follows:

Q: At a university,a professor is interested in whether the size of tableware influences how much…

A: Since, we only do up to three sub parts of a problem, we'll be doing the first three sub parts only.…

Q: A conservationist measures the diameters in centimeters of 100 oak trees in a forest. The data is…

A: Given Information: The five number summary of the data is: Minimum value = 3 First Quartile Q1=16.2…

Q: a. Determine the ē, Sp, UCL and LCL for a c-chart with z= 2. (Leave no cells blank. Round up any…

A:

Q: Archeologists excavating at a Viking site in Newfoundland have determined that the age of the…

A: Mean 95% of the artifacts are between 900 and 1100 years old.

Q: Sometimes a month, managers of 1,200 retail stores place replenishment orders with the parent…

A:

Q: 2) In the year 2033, Kayla Faruq is leading emergency room doctor. Kayla is presently researching…

A: Given :  Normal distribution :  We know normal distribution follow Empirical rule : (68-95-99.7)…

Q: To assess the reliability of timber structures and related building design codes, many researchers…

A: d) From part c, there exists significant difference among three trending strengths. Hence, we use…

Q: The U.S. state of wyoming hired an education firm implement a program to help students in science,…

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

Q: Which of the following typically uses larger samples and is thus typically more statistically valid?…

A: Qualitative study typically involves non random sampling whereas quantitative study requires that…

Q: To help the development of viable fisheries in Florida for lionfish, researchers needed to evaluate…

A: To explore how total mercury concentration (THg) changes in relation to the standard length (mm) of…

Q: A: 5, 4, 6, 3, 6, 7 B: 6, 5, 7, 6, 1, 8 Which data set has the greater sample standard deviation,…

A:

Q: 3. Assume that you want to test the claim that the paired sample data come from a population. Use…

A: Given, sample size = n = 10 sample mean of difference = x¯d = -0.9 Sample standard deviation of…

Q: Prof. Gersch constructs a 95% CI for an unknown population mean. If Prof. Gersch instead wants to…

A: We have to find correct answer from given options..

Q: Jeff Parent is a statistics instructor who participates in triathlons. Listed below are times (in…

A:

Q: Solve the problem. A researcher wants to use a paired sample to determine whether the mean number of…

A: In the given problem we need to test whether there is difference between the mean number of hours…

Q: 1. Why are some quantities in 2. Explain how linear regression is used to find the equation that…

A: Introduction -  Uncertainty = ∑Xi-μ2n×n-1where , n = size of the population μ= mean

Q: Here is a data set summarized as a stem-and-leaf plot: 1. 013667999 002233455555799 07889 379 How…

A: In the stem-and-leaf plot, the data is arranged in ascending order.

Q: ppose that 97% of Monarch butterflies migrate to Mexico in winter. What is the smallest sample size…

A: Given data, 97% of Monarch butterflies migrate to Mexico in winter p=97%=0.97 What is the smallest…

Q: ld a researcher increase the efficiency of a point estimate?    a) decrease the alpha   b) increase…

A: The efficiency of a statistic is known as the degree, to which the statistic is stable from sample…

Q: 3). Suppose that a sampling frame lists all households in Tampa. Investigator would like to estimate…

A: The objective of the question is to estimate the average amount spent on food per week by all…

Q: A travel agency wants to study the yearly family travel expenses of the customers. A random sample…

A:

Q: QUESTION 1 Which of these control chart types allows constant sample size? i. C-chart i. U-chart ii.…

A: Here we want to know control charts which allows constant sample size.

Q: Q3) A sample of outer diameter measurements of plain washers is given at below table. 3.2 mm 3.3 mm…

A: It was stated that a sample of outer diameter measurements of plain washers are given. The data is…

Q: Indicate the most appropriate statistical analysis method for situations a - d below. a)…

A: Note: Since you have posted multiple independent questions in the same request, we will solve the…

Q: 10. You want to know the effects of the COVID-19 to the Filipino people and you will ask the medical…

A: here use basic of sampling method

Q: From the list below of the data being collected, identify which data would be considered variable…

A: Definition of variable:A characteristic of an individual or an item is called variable. It varies…

Q: A grade 9 class was asked how many first cousins you have. Their answer is shown below. 1 3 2 1 2 a)…

A: Given that  The data are  1,3,2,1,2,2,1,1,2,4,1,2,1,4,3,1,1,2,2,1,2,1,2,4,3,2,2,1,3,4,1,2

Q: 16. The Oceanside Apparel Company manufactures men's knit shirts. The production process requires…

A:

Q: It is known through Operation Laban Altapresyon that 15% of adults from the Province of Realeza are…

A: Chi -square test : A chi-square test is a statistical test that is used to compare observed and…

Q: b) The data in table 4b below gives the number of nonconforming bearings and seal assemblies in a…

A:

Q: A High performance Tailoring company "Shawapna" at Mirpur sampled its delivery records (in days) for…

A: First we have to calculate the mean and SD for Shawapna company and then coefficient of variation to…

Q: A fictitious survey has been conducted to examine whether a person's age influences their IQ score.…

A: The given data paired set for the age and corresponding IQ score for the two samples are as…

Q: In order to estimate the difference between the average Miles per Gallon of two  different models of…

A: Independent samples t-test is done to test the significance difference between population means.

Q: It is known through Operation Laban Altapresyon that 15% of adults from the Province of Realeza are…

A:

Q: 1. If X ~ N(200,2²), find а) Р(X < 197) b) Р(Х < 200 .5)

A: Note: According to Bartleby, expert solve only one question and maximum 3 subpart of the first…

Q: What is/are the most appropriate sample proportion/s (p) and population proportion/s (P),…

A: We have to calculate sample proportion and population proportion for given data.

Q: Suppose an instructor wants to know the average height, gender distribution, academic performance…

A: According to the answering guidelines, we can answer only three subparts of a question and the rest…

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.