A textile engineer is interested in measuring heat resistance for four different types of threads used in making fire-resistant clothing for firefighters. A random sample of 20 threads from each type was taken and subjected to hear test to determine resistance (the length of time the fibers survive before starting to burn). Explain what type of study this is and why.
Q: The Department of Natural Resources (DNR) received a complaint from recreational fishermen that a…
A: "Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at…
Q: You have been asked to collect data on the effectiveness of the EHR (electronic health record)…
A: Given information: It is required to state the data collection method for the given endeavor.
Q: .The median is 2.The mode is 3.The mean is
A:
Q: The Specific Absorption Rate (SAR) for a cell phone measures the amount of radio frequency (RF)…
A: Given: Population standard deviation σ=0.337 Sample mean of the Specific Absorption Rates (SARs) for…
Q: A marketing researcher measures 100 doctors’ reports of the number of their patients asking them…
A: Use the given information to determine the type of t-test in the given data. From the information,…
Q: A research study is being conducted to see if a new diabetes medication will be successful. The…
A:
Q: A study was conducted to determine whether automobile repair charges are higher for female customers…
A: In the given situation, the two samples are randomly selected at 20 repair shops. Here, the repair…
Q: An industrial-organizational psychologist believes that implementing a 2-hour lunch break at US…
A: As per the belief of the industrial -organizational psychologist implementation of a 2-hour lunch…
Q: for the 20 individuals
A: The rate table is given as, Ate Ate Ate Not ate Not ate Not ate Menu Total Became ill Rate %…
Q: Fifty patients with high lipoprotein and thirty patients with low lipoprotein were observed. None of…
A: Introduction: It is required to calculate the relative risk of developing ischemic stroke in eight…
Q: uring a season in order to restock the lake with the appropriate number of young fish. The ommission…
A: Given:- Below is the least-squares regression equation: In (y) = 0.76 + 0.0914x.
Q: Six river locations are selected and the zinc concentration is determined for both surface water and…
A: For the same river, we are taking data for surface water and bottom water. So, the data is not…
Q: (a) Construct a 95% confidence interval for the the mean annual gas consumption for houses with…
A: The associate with a interval estimate is called confidence interval. A range of values can be…
Q: Create a hypothetical example involving 2K design. Explain the treatments and their levels in your…
A: The 2k designs are a major set of building blocks for many experimental designs. These designs are…
Q: A rare birth defect occurs in approximately 0.5% of all cases in males. If we sample all the males…
A: Given information: The total number of males born in 2016 in a specific region is N = 200,000. It is…
Q: Question 19 A random sample of size 329 results in 148 successes. Find the margin of error for a 92%…
A: Given data,n=329x=148p=xn=148329=0.4498z-value at 92% confidence is Zc=1.75E=?
Q: If x is a random variable with Binomial distribution of n=6 and p=0.55, find: i. E(X). i. Var(X).…
A: It is given that n=6 and p=0.55.
Q: The American Academy of Pediatrics offers guidelines and recommendations for how much “screen time”…
A: Given data,No of parents n=200proportion of these parents who indicate they follow screen time…
Q: Jennifer wants to estimate the percentage of parents that use cloth diapers. She asks a randomly…
A: Solution: It is given that Jennifer wants to estimate the percentage of parents that use cloth…
Q: The accompanying table shows the percentage of people with 2 dosage of Covid vaccine administered.…
A: Given data:
Q: The ANOVA table that corresponds to this data is below. What type of tests could you conduct that…
A: Here the dependent variable is the body temperature of the adults.The three treatments are aspirin,…
Q: Classify each describtion
A: A) - Experimental the scientist wants to experiment that if the new glove is different than the old…
Q: What represents a trial of taking six shots
A: A trial is a single performance of a well-defined experiment. Hence, a trial has a well-defined set…
Q: A frequency distribution shows the sample is 90% female, which is very heterogeneous somewhat…
A: A sample is a smaller subset of data which is used by the researcher to conduct analysis and draw…
Q: Why it is important to consider power while designing an experiment?
A: A test of hypothesis consists of 2 hypotheses: the null, H0, and the alternative, H1. Power: The…
Q: A paint manufacturer wants to compare the drying times of two different colors of paint. Independent…
A: To test the hypothesis t-test Independent sample t-test will be used. State the null and alternate…
Q: What is the answer to question 15?
A: Null Hypothesis (H0): The mean reading skills of children diagnosed with dyslexia before using the…
Q: A population consist of numbers 3,6,9,12, and 20 and the sample size n=3 (apply the 8 steps ,upload…
A: Population Numbers are 3 6 9 12 20 From the given population samples are prepared with size 3…
Q: A randomized experiment measured weight gain (in grams) of makes rats under six diets varying by…
A: Introduction: The study consists of two factors: source of protein at three levels- beef, cereal,…
Q: Over a nine-month period, OutdoorGearLab tested hardshell jackets designed for ice climbing,…
A: 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 Now first we will arrange the given data in increasing order as 4, 5,…
Q: The table below shows the results from the specific gravity (S.G.) test performed in a soil…
A: SG=25 20 samples of sand To find:- The number of samples have S.G. less than 2.65. Specific…
Q: A special close-tolerance retaining was manufactured for the space shuttle space craft. The machine…
A: given data P(defective) = p = 0.08sample size(n) = 8 ringsx = no. of defective ringsP(x=X) =…
Q: expensive). The toy was priced the same at all retail stores. Compute the percentage of variance…
A:
Q: A college student is interested in whether presoaking time has an effect on cleanliness of clothing.…
A: 1 A) Compute the grand mean using the formula: x¯=∑ix¯ik Where, x¯i is the mean of the ith group and…
Q: The council leaders of a small town would like to determine the average number of people living in…
A: The objective of the question is to identify the type of sampling method used by the council leaders…
Q: Total plasma volume is important in determining the required plasma component in blood replacement…
A: (b) Identify the conditions that are necessary for the calculations. The correct option is…
Q: An automobile dealer conducted a test to determine if the time in minutes needed to complete a minor…
A: Given data: Computerized Electronic Compact 51 42 Intermediate 55 43 Full-sized 62 47…
Q: Please show all working manually
A: 2) Let us find ** first. Now ** = Row total of observed values for Small size = 45+23+16+32+52 = 168…
Q: A statistical program is recommended. The National Football League (NFL) records a variety of…
A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…
Q: Determine the number of samples you will choose from a population of 5,200 considering that you…
A: Given: Population size N=5200 Margin of error e=5% Then to find sample size n=??
Q: The potential of using solar panels constructed above national highways to generate energy was…
A: The data shows the amount of energy supplied to the country's grid by the solar panels above the two…
Q: The background concentration of a chemical in soil was measured on ten random specimens of soil from…
A: This question aims to determine the cleanup target concentration of a chemical in soil, based on 10…
Q: (c) We want to test if there is a (positive) reduction in annual gas consumption provided by the…
A: For testing the assumed claim that two population means (i.e., "the true mean annual gas consumption…
Q: A group of doctors published an article in the New England Journal of Medicine. In the article they…
A: Solution: Given information: n1= 367 Sample size of assigned to surgery n2= 364 Sample size of…
A textile engineer is interested in measuring heat resistance for four different types of threads used in making fire-resistant clothing for firefighters. A random sample of 20 threads from each type was taken and subjected to hear test to determine resistance (the length of time the fibers survive before starting to burn). Explain what type of study this is and why.
Step by step
Solved in 2 steps
- A state fisheries commission wants to estimate the number of bass caught in a given lake during a season in order to restock the lake with the appropriate number of young fish. The commission could get a fairly accurate assessment of the seasonal catch by extensive “netting sweeps" of the lake before and after a season, but this technique is much too expensive to be done routinely. Therefore, the commission samples a number of lakes and record the seasonal catch (thousands of bass per square mile of lake area) and size of lake (square miles). A simple linear regression was performed and the following R output obtained. Estimate Std. Error t value Pr(>|t|) (Intercept) 2.5463 0.4427 5.7513 0.0000 size 0.0667 0.3672 0.1818 0.8578 If a scatterplot showed a non-linear relationship between the response and explanatory variables, what should be done? O Nothing. Continue the analysis as is. Stop the analysis. Perform a natural log transformation on the response variable first. O Perform a…he data on the number of chocolate chips per bag for 42 bags of Chips Ahoy! cookies were obtained by the students in an introductory statistics class at the United States Air Force Academy in response to the Chips Ahoy! 1,000 Chips Challenge sponsored by Nabisco, the makers of Chips Ahoy! Use the data collected by the students to answer the following questions and to conduct the analyses required in each part. They found ¯xx¯ = 1261.6 and s = 117.6 a. Determine a 95% confidence interval for the mean number of chips per bag for all bags of Chips Ahoy! cookies. ≤μ≤≤μ≤ b. Interpret your result in words. c. Can you conclude that the average bag of Chips Ahoy! Cookies contain at least 1000 chocolate chips? yes noShow the impact of sample size on power?
- In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. Upon ascertainment of all lung cancer deaths, the investigator obtained the following data: Number of Individuals Lung Cancer Deaths Smokers 24,500 15 Nonsmokers 10,500 2 Calculate the risk difference per 100,000 per year. Round to the tenth decimaSeveral methods of estimating the number of seeds in soil samples have been developed by ecologists. An article gave the accompanying data on the number of seeds detected by the direct method and by the stratified method for 27 soil specimens. Specimen Direct Stratified 1 21 6 2 32 38 3 0 6 4 60 58 5 20 52 6 61 61 7 40 26 8 6 6 9 12 6 10 92 100 11 1 0 12 66 58 13 78 66 14 21 52 Specimen Direct Stratified 15 32 26 16 0 0 17 38 38 18 18 12 19 92 92 20 1 12 21 40 46 22 21 21 23 0 0 24 6 12 25 12 40 26 18 12 27 40 78 Do the data provide sufficient evidence to conclude that the mean number of seeds detected differs for the two methods? Test the relevant hypotheses using ? = 0.05. (Use ?direct − ?stratified.) Find the test statistic. (Round your answer to two decimal places.) t = Find the df. (Round your answer down to the nearest whole number.) df = Use technology to find the P-value. (Round your answer to four…A consumer group wanted to determine if there was a difference in customer perceptions about prices for a specific type of toy depending on where the toy was purchased. In the local area there are three main retailers: W-Mart, Tag, and URToy. For each retailer, the consumer group randomly selected 5 customers, and asked them to rate how expensive they thought the toy was on a 1-to-10 scale (1= not expensive, to 10 = very expensive). The toy was priced the same at all retail stores. 1. What kind of statistical test should be used to test the consumer group's research goal, assuming that the researcher wanted to use the 1-to-10 scale as a numerical interval measure? A. Repeated-measures t-test B. One-way Independent Measures ANOVA C. Repeated-measures ANOVA D. Independent-measures t-test 2. State the hypothesis that aims to test the consumer group’s research goal (i.e., what is H0 and HA).
- In a study conducted in Italy, 10 patients with hypertriglyceridemia were placed on a low-fat, high-carbohydrate diet. Before the start of the diet, cholesterol and triglyceride measurements were recorded for each subject. Patient Cholesterol Level (mmol/l) Triglyceride level (mmol/l) 1 5.12 2.30 2 6.18 2.54 3 6.77 2.95 4 6.65 3.77 5 6.36 4.18 6 5.90 5.31 7 5.48 5.53 8 6.02 8.83 9 10.34 9.48 10 8.51 14.20 a. Construct a two-way scatter plot for these data. b. Use STATA to calculate Pearson’s Correlation Coefficient for these data. c. Test, α = 0.05, whether or not the population correlation, ρ, equals 0.You may need to use the appropriate technology to answer this question. An automobile dealer conducted a test to determine if the time in minutes needed to complete a minor engine tune-up depends on whether a computerized engine analyzer or an electronic analyzer is used. Because tune-up time varies among compact, intermediate, and full-sized cars, the three types of cars were used as blocks in the experiment. The data obtained follow. Analyzer Computerized Electronic Compact 50 41 Car Intermediate 54 44 Full-sized 64 47 Use a = 0.05 to test for any significant differences. State the null and alternative hypotheses. O Ho: MCompact = "Intermediate = HFull-sized H: "Compact * "Intermediate * "Full-sized O Ho: "Compact * "Intermediate * HFull-sized H: "Compact "Intermediate = "Full-sized O Ho: Computerized = HElectronic H: "Computerized * HElectronic O Ho: "Computerized = HElectronic = "Compact = Intermediate = Full-sized H: Not all the population means are equal. O Ho: HComputerized *…what is the population of focus? a reasearch is being done to determine canopy spread of a type of MATURE tree in a given location. the location has 40,000 of these and the mature trees are estimated at 10feet tall. the research collected spread from 1000 random mature trees.