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Mathematics Questions and Answers March 12, 2022

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Suppose that X,Y~ iid U(0,1). Derive and sketch the density of R=Y/(Y-X) calculate and mark in your sketch the mode (M), median (m), lower quartile (q) and upper quartile (Q) of R

Post the following information for your categorical variable: A frequency distribution. An appropriate measure of variation. How variable are the data? How would you describe this data? What sort of research question would this variable help answer that might inform social change? Statistics HIGHEST YEAR OF SCHOOL COMPLETED N Valid 507 Missing O
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You will toss a coin up to three times. Refer to the tree diagram below. What is the rule of the game? Head You win. Head 0 You win. You lose. You lose. A You win when you get two Heads in a row. A You win when you get two Heads. A You win when you get two Tails in a row. A You win when you get two Tails
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Calculate the mean, median, and mode for the following sample: 2, 2, 6, 9, 10, 11, 15, 17, 18, 20.

3. (a). The cost($C) of making a cylindrical rod varies jointly as the square of it's base radius(r cm) and it's height(h cm). It cost $50 to make a cylindrical rod of base radius 2 cm and a height of 5 cm. (i). what is an equation involving Cost, radius and height of the cylindrical rod and use it to find the constant of variation. (ii). What

If your mean, median and mode are all equal, then your data is normally distributed

4. The Chancellor of the North Orange Community College District wanted to perform a study on the amount of time it takes students at Fullerton and Cypress colleges to transfer to a four-year university. As part of this study, newly transferred students from each campus were randomly selected and were asked to disclose how many years it took them

Which of the following statements is most accurate? multiple choice 1 Using 0.5 as the cutoff value, the misclassification rate of the nave Bayes model is about 31%. The nave Bayes model is 64% more accurate than the nave rule (classifying all cases into the predominant class). Using 0.5 as the cutoff value, the nave Bayes model is able to

A can of soda is labeled as containing 11 fluid ounces. The quality control manager wants to verify that the filling machine is neither over dash filling nor under dash filling the cans. Complete parts (a) through (d) below. Question content area bottom Part 1 (a) Determine the null and alternative hypotheses that would be used to determine if the

x 0 1 2 3 4 5 % 3 11 28 39 12 7 calculate expected value of x distribution calculate standard deviation of x distribution

Nutrient Intake Intake Intake Intake Day 1 Day 1 Day 2 Day 2 (amounts) (%) (amounts) (%) GENERAL Total Calories (Energy) Alcohol (g) Water (g) CARBOHYDRATES Carbs (g) Fiber (g) LIPIDS Fat, Total (g) Monounsaturated (g) Polyunsaturated (g) Saturated (g) Trans (g) Cholesterol (mg) PROTEIN Protein (g) VITAMINS B12 (Cobalamin) ug Folate (ug) Vitamin A
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solve the question Twenty adult males between the ages of 30 and 40 participated in a study to evaluate the effect of a specific health regimen involving diet and exercise on the blood cholesterol. Ten were randomly selected to be a control group, and ten others were assigned to take part in the regimen as the treatment group for a period of 6
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Some of the strengths, weaknesses, and caveats related to correlational research.

Need Hypothesis, anova, Conclusion, Recommendation, Standard deviation, P-value, Z-score and Interpretation in this data. Strongly Agree 29 Agree 55 Neutral 34 Disagree 7 Strongly Disagree 4 Sum 129 Mean 25.8 Topic: I prioritize learning rather than getting high grades

On an exam with a mean of M = 98, you obtain a score of X= 90. Would you prefer a standard deviation of s=2 or s=8?

HI, please assist me completing the assignment below. Thank you! The batting average of a baseball player is the number of "hits" divided by the number of "at-bats." Recently, a certain major league player's at-bats and corresponding hits were recorded for 200 consecutive games. The consecutive games span more than one season. Since each game is
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La meta de 6 Sigma, es llegar a un mximo de 3,4 DPMO, en-tendindose como defecto cualquier evento en que un producto o servicio no logra cumplir los requisitos del cliente. Seleccione una: a. Falso. b. Verdadero

n the ProbStatExams data, the Exam 2 average overall is about 74.45; the SD is about 23.84. Now, what is the standard deviation (to about one decimal place) of the Exam 2 scores among students that scored 100 on Exam 1? Use the RMS-error of the regression line to estimate it

3. (From text) The metro train arrives at the station near your home every quarter hour starting at 6:00 am. You walk into the station every morning between 7:10 and 7:30 am, with the time in this interval being a random variable with given PDF. Let X be the elapsed time, in minutes, between 7:10 and the time of you arrival. Let Y be the time that
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Question 4: Germination Data Revisited In this question we go back to germination data, like in the lab. Lots of what you'll need was covered in the lab examples, but there are also some fairly challenging parts to this question. If you are struggling and short of time, you may decide to skip some of the more challenging parts towards the end, and

The most important variable in a two level two factor DOE is the one with the greatest change visible on the main effects plot when the factor is changed between two levels

Answer the below questions (5) based on the tables (statistics) provided below, preferably in paragraphs. Interpret the results of the statistical analysis (do you reject the null; do you accept the null?). Explain in lay terms what rejecting/accepting the null means in your case. Look at the means of each group. Is this what you expected the
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can you please the solution, can you also provide me the explanation. \f\f
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Statistics regarding student and staff demographics indicate which of the following? A. Students and staff are typically similar in respect to cultural and linguistic background. B. Most staff and administrators are experts in cultural competency. C. Students and staff are typically not similar in terms of cultural and linguistic background. D.

Can you help me solve problem #1 venient, use technology. Option 1: Find the critical value(s), identify the rejection region(s), and find the appropriate standardized test statistic. Option 2: Find the appropriate standardized test statistic and the P-value. (d) Decide whether to reject or fail to reject the null hypothesis. (e) Interpret the
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A researcher counts how many seconds each bystander takes to stop and help a stranger struggling to pick up a heavy box. The data demonstrated varying amounts of time but showed 12 seconds and 16 seconds equally as much in the data (6 times each). All the rest occurred less times than those. That means the data are... histogram

A ________________ is the statistic that describes the strength of a relationship

In a large university, 15% of the students are female. If a random sample of twenty students is selected, b.what is the probability that the sample will contain no female students? c.what is the probability that the sample will contain exactly twenty female students? I know that nCr=4845 combinations, how can I calculate from here?

Ashok Chemicals Company manufactures two chemicals A and B which is sold to the manufacturers of soaps and detergents. On the basis of the next month's demand, the management has decided that the total production for chemicals A and B should be at least 350 Kg. Moreover, a major customer's order for 125 Kg of product A must also be supplied.

question shows below: Let X ~ Unif[-1, 1]. What is EX9? OO 1/10 2/10 None of the other answers are correct O 1
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What is the domain of f ( x ) = 2 l o g 5 ( 4 x ) ?

Principle 2: When the confidence intervals in two different populations do not overlap, it is reasonable to conclude that the two populations are different. 1. Profitable Upgrade? Your company must charge $100 for a software upgrade to make a profit on its development.You must find out if your customers are willing to pay this much.A random sample

A researcher found that students who took a research methods course watched more TED talks than those who had not taken a research methods course. In order to evaluate the practical significance of these results, at minimum you would need ______

Grouped bar charts are also called clustered bar charts. a. True b. False

Does it pay to ask for a raise? A national survey of heads of households showed the percentage of those who asked for a raise and the percentage who got one. According to the survey, of the women interviewed, 26% had asked for a raise, and of those women who had asked for a raise, 45% received the raise. If a woman is selected at random from the

answer a and b please x - ux t= x - ux Formulas: Z = Sx Vn R2 f = k - 1 1 - R2 n - k a. Suppose a Tesla dealer in Placentia, CA is trying to calculate the probability of his car sale for next week. The dealer knows that the sale of car is normally distributed with mean sale 86 and variance (population variance) 36. What is the probability that the
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If body P illustrated on the drawing below has an angle f equal to 30 degrees, the rotation matrix will be

Evaluate Z Z Z E y^2 dV where E is the solid hemisphere x^2 + y^2 + z^2 4 and y 0. (set up but do not evaluate)

Bought only the expected items Bought more items than expected Row Totals Had a shopping list 0.43 0.17 0.60 Did not have a shopping list 0.22 0.18 0.40 Column Totals 0.65 0.35 1.00 If a customer purchased used a shopping list, what is the likelihood that the customer purchased only the expected items

Hi! Please help me solve this statistics problem thank you! A state legislator wishes to survey residents of her district to see what proportion of the electorate is aware of her position on using state funds to pay for abortions. (Round your answers up to the nearest integer.) (a) What sample size is necessary if the 95% CI forp is to have a
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An inference to the best explanation will rely on: An inference to the best explanation will rely on: Unobserved facts A close correlation between two events A hypothesis based on observed facts An analogy derived from relevant similarities

Over the past several months, an adult patient has been treated for tetany (severe muscle spasms). This condition is associated with an average total calcium level below 6 mg/dl. Recently, the patient's total calcium tests gave the following readings (in mg/dl). Assume that the population of x values has an approximately normal

How would the coefficient for an interaction term that is Square Feet multiplied by a dummy variable for Location, contribute to the model if Location is coded 1 for Shorewood Hills and 0 for Middleton? Group of answer choices It would add to the slope coefficient associated with house size for homes in Shorewood Hills. It would add to the model

Cross-Tabulation Response Liberal People Significant Overreaction 0.5 16.3 Slight Overreaction 1.7 15.6 Appropriate Given the 70.0 19.7 Circumstance Slight 25.2 Under-reaction 22.6 Significant 5.2 under-reaction 23.1 Total 100.00 99.9 Count 3291.0 147.0
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Soon after the polls close on Election Day, the media often predicts the outcome of the election. These predictions are based most heavily on Group of answer choices reporters' gut instincts. trial ballots distributed to a random sample of citizens approximately one week before Election Day. official election results. straw polls. exit polls

].\\5 marks| LISing the multiple decrement table described above, calculate independent rates BESUMTIE LICE in THE multiDE JECTEment table { { Do
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In multiple paragraphs show statistics of how audience engagement has been declining on going to movie theaters to watch a movie and statistics of how rotten tomatoes also play a part as to why people don't go to the theaters. Add the reference you used

Evaluate the surface integral, *double integral* S F d S for the given vector field F and the oriented surface S . In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F ( x , y , z ) = y i x j +2 z k , S is the hemisphere x 2 + y 2 + z 2 = 4, z 0, oriented downward

##Question 2 Use the following commands to install the marketing dataset and load the datarium package into your session. #install.packages("datarium") library(datarium) data("marketing", package = "datarium") str(marketing) ## 'data.frame': 200 obs. of 4 variables: ## $ youtube : num 276.1 53.4 20.6 181.8 217 ... ## $ facebook : num 45.4 47.2

Randomness in activity times _blank_ averages itself out. Multiple choice question. usually never rarely always

Is P(X = 10) = 0.02(0.98)^9 same as P(X = 10) = 0.98^(10-1) * 0.02 = 0.016674956

Laquelle des valeurs de score Z suivantes reprsente l'emplacement le plus loigne de la moyenne? Z = +1.00 Z= -2.00 Z= -1.00 Z= +0.5

o calculate a 99% confidence interval, the value z* in the margin of error should equal: A 2.576. B 1.96. C 2.33. D 1.645.

In 2005, 1,475,623 students heading to college took the SAT. The distribution of scores in the math section of the SAT follows a normal distribution with mean = 520 and standard deviation = 115. What math SAT score is 1.3 standard deviations above the mean? What can you say about this SAT score? (Enter your answer to one decimal place.) The score

As concrete cures, it gains strength. The following data represent the 7-day and 28-day strength in pounds per square inch (psi) of a certain type of concrete. 7-Day_Strength_(psi)_-_x 28-Day_Strength_(psi)_-_y 3380 5020 2890 4620 3330 4850 2480 4120 3390 5220 Use technology to find the estimates of 0 and 1. 0 b0 = 1 b1 = Compute the standard

A sample mean, sample standard deviation, and sample size are given. Perform the required hypothesis test about the mean, , of the normal population from which the sample was drawn. x=7.6 ,s=2.3, n =18,H 0 : 10,H a : <10, =0.01 A: Test statistic:t=-4.43. Critical value:t=-2.33.Do not rejectH 0 . There is not sufficient evidence to support the

Conditioned on the result of an unbiased coin flip, the random variables T1, T2.... Tn are independent and identically distributed Conditioned on the result of an unbiased coin flip, the random variables T1 , T2, . . . , Tn are independent and identically distributed, each drawn from a common normal distribution with mean zero. If the result of
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Question#3 (Chapter 9) For students with last names beginning with I-P: Paid days off and the single-sample t test : The number of paid days off (e.g., vacation, sick leave) taken by eight employees at a small local business is compared to the national average. You are hired as a consultant by the new business owner to help her determine how many

You need to conduct an exploratory analysis (descriptive statistics, visualisations, clustering, etc.) based on the customer data to understand the characteristics of churned, non-churned, and high- value customers. You can use either SAS Enterprise Miner, Excel or Tableau (or combinations ) for this analysis

10.) The following table contains cholesterol levels of 32 people. Determine if the sample comes from a population that is normally distributed. Draw a histogram, identify potential outliers, and draw the normal probability plot. 168 191 176 194 170 203 185 199 188 213 200 197 171 190 184 255 204 187 200 199 180 183 204 209 208 189 179 194 184 190
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Can you explain how to find the revenue model from a linear demand model?

Comfort Food Magazine states the average calories of a medium size hot dog is 238. A random selection of 36 different brands of medium size hot dogs has a(n) average of 227 calories. The standard deviation of the population is 37.22 calories. Can it be concluded that the average calories of a medium size hot dog is different than 238 based on

I am having issues figuring out how to conduct a monte carlo simulation, could you tutor me in how to conduct one? Below is the problem I am working on, anything would be appreciated. \f
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Solve the initial value problem where y''+4y'-21y=0, y(1)=1 y'(1)=0 Use t as the independent variable.

1 Instructions for Questions 1 - 6 Georgia Tech Bank (GT Bank) just hired you as a consultant, to help them better understand their business. On your first day, you decide to use the "Credit" dataset from the ISLR package, as a proxy, to answer questions about their customer base. Use the "Credit" dataset from the ISLR package , drop the ID

7. (1 mark) Let x] = (1,1,1) and x2 = (3, - 1,4) ]: A. Do x and x2 span R3? Explain. B. Let x3 be a third vector in R'and set X = (X] X2 X3) . What condition(s) would X have to satisfy in order for x1, x2, and x3 to form a basis for R3 ? C. Find a third vector x3 that will extend the set {x1,X2} to a basis for R3
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Suppose that A and B are independent events such that = P(A)= 0.10 and = P(B with a line over the B)= 0.60. Find P(A B) and P(A B). (a) P(A B) = (b) P(A B)=

the chances or likelihood that one thing will happen rather than another thing. a. Outcome b. Odds c. Expected value

9) A special aptitude test is given to job applicants. The data shown here represent the scores of 30 applicants. Construct a stem and leaf plot for the data and summarize the results. 204 210 227 218 254 256 238 242 253 227 251 243 233 251 241 237 247 211 222 231 218 212 217 227 209 260 230 228 242 200
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Take a look at the table which shows the structure of a small production facility.The numbers in the table stand for the number of employees working in a specific business unit and having specific performance level.An employee is selected at random. Findthe CORRECT statements.Keep in mind that the mark will be reduced for incorrect answers -do not
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Use the given information to find the p-value. Also, use a 0.05 significance level and state the conclusion about the null hypothesis(reject the null hypothesis or fail to reject the nullhypothesis). With H1: p0.377, the test statistic is z=3.06. A. 0.0022; fail to reject the null hypothesis B. 0.0022; reject the null hypothesis C. 0.0011; fail to

Using the the regression model for Texas School Covid data explains a very high proportion of the relationship between students risk of having covid and the other factors we looked at, i.e. > 50%. true or false

A researcher would like to estimate the proportion of all children that have been diagnosed with Autism Spectrum Disorder (ASD) in their county. They are using 95% confidence level and the CDC national estimate that 1 in 68 0.0147 children are diagnosed with ASD. What sample size should the researcher use to get a margin of error to be within 2%?

1.The quality control director of a small company that manufactures exercise equipment knows that 10% of their products are defective.Market research shows that only 30% of their customers will use the product in the first year after the sale.So, the manufacturer expects that 3% of the units will be returned for service under a one-year full

Explain how you arrived at the answer. What is the next number in series 2, 3, 5, 7, 11, 13, ? I am stuck as it does not seem like a AP or GP.

Question 1 Which IAT data set are you working with? Race IAT Variables One sample T confidence interval: : Mean of age 90% confidence interval results: Variable Sample Mean Std. Err. DF L. Limit U. Limit Age 33.962867 0.55994083 699 33.040624 34.88511 Are conditions met to estimate the mean age for the population of IAT participants? (Be sure to

The average price of a personal computer (PC) is $949. a. If the computer prices are approximately normally distributed and = $100, what is the probability that a randomly selected PC costs more than $1200

A certain virus infects one in every 400 people. A test used to detect the virus in a person is positive 90% of the time if the person has the virus and 10% of the time if the person does not have the virus. Let A be the event "the person is infected" and B be the event "the person tests positive".A.) find the probability that a person has the

Set 1: Prove the following statement (using indirect proof method): For all integers a, b, c, the product (ab)(ac)(bc) is even. (Hint: Use the following cases: i) a, b, and c even integers ii) a, b, and c are odd integers iii) a is even, but b and c are odd integers iv) a is odd, but b and c are even integers)

Susceptibilities Susceptible Row Labels Count of Susceptibilities <20 Explain

Based on a sample of 36, you wish to test if the average calorie intake for females is less than the expected calorie intake of 2000 kcal. The sample have an average calorie intake of 1875 kcal with a standard deviation of 270 kcal. The alpha is 5%. The correct statistical decision is to __________________________ Question 28 options: a) accept

Claire Lewis is running for mayor in her local town for the first time. The town's newspaper reports that between46.2% and 56.7% of residents support her (based on a sample of 350 residents where 180 residents support her). Claire's biggest opponent, Scott Allen, releases a statement and says, "This race is not over yet. Claire Lewis is leading in

An urn contains 8 white balls and 12 red balls.A sample of four balls is selected at random from the urn.What is the probability that the sample contains two white balls and two red ones? 0.3814 b) 0.3933 c) 0.0424 d) 0.1028 e) 0.1474 f) None of the above.

A random sample of 48 customer orders reveals that 11 of them had errors. Determine the 85% confidence interval for the population porportion of errors. Enter lower bound and upper bound rounding to the nearest thousandths place

Describe the type of data needing to be collected and the techniques you would use when analyzing pre-test and post-test scores, conducting teacher evaluations, and making classroom observations.

Hello, can you tell what your thoughts are on these? Thank you .1 A student wondered if more than 10% of students enrolled in an introductory Chemistry class dropped before the midterm. Suppose he performed a hypothesis test to test his claim. In the context of the problem, what would happen if the student made a Type I Errol"? Choose the correct
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Prepare a short narrative to describe the sample and your analysis. Your narrative should include the following: the distribution of age range, also include the mean and standard deviation of age. Include a narrative of sample that includes: gender, race, smoking/tobacco use, and the smoking/use and packs per day

Hi, do you mind explaining me how to find degrees of freedom, because for external, internal standard and standad addition method, they have different Dof. Like what are the degrees of freedom for each and they come from what. are they due to slope, intercep, average.. i am really confused, thanks!

Attempt You are a member of your college's Institutional review board. You must decide whether several research proposals qualify for lighter review because they involve only minimal risk to subjects. Federal regulations say that "minimal risk" means that the risks are no greater than "those ordinarily encountered in daily life or during the
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In City X, it snowed on 68 percent of the days. However, 80 percent of the days when it was not supposed to snow, it snowed and 40 percent of the days when it was supposed to snow, it did not snow. Of the days when it did not snow, what percent of the days it was supposed to snow? 22% 32% 60% 75% 80%

A consumer products company wants to measure the effectiveness of different types of advertising media in the promotion of its product.Specifically, the company is interested in the effectiveness of radio advertising, newspaper advertising, and internet advertising.A sample of 22 cities with approximately equal populations is selected for study

I have two questions I need help with on my math homework... is anyone able to help me? Explain how to do these? I really need help. The marital status distribution of the U.S. male population, ages 15 and older, is as follows: 35.4% never married, 53.6% married, 2.7% widowed, and 8.3% divorced/separated. A random sample of 300 U.S. young adult

These correlation coefficients are in order from the weakest to strongest in terms of strength of linear association. negative 0.930 comma space minus 0.431 comma space 0.028 comma space 0.346 comma space 0.835 a) True b) False

A case-control study was conducted to assess the association between exposure to chemical solvents and bladder cancer. The researcher assembled a sample of 55 cases and 2820 controls. Among the cases, 45 had been exposed to solvents; among the controls, 1880 had been exposed. Using these hypothetical data, what are the odds of exposure among the

It is estimated that a 2-week trip to Barbados four years from now will cost a total of $12,000. Calculate to the nearest cent how much you should invest now at 5% APR so that you will have this $12,000 in four years if interest compounds: (a) annually (b) quarterly (c) hourly (assume there are 365 days in a year).

This is what I need help with could it be done by Saturday, 20 th 2016? Individual Project Female Data Set Individual Project Male Data Set You will need these two files ABOVE to do your Individual Project assignment. (Hint: Excel allows you to SORT. Use this feature on the above Data Sets to help categorize by teens, 20's, 30's, 40's, 50's, 60's,

You want to make a statement about the variability in the costs of personnel shelters. With 8 observations, Xbar=$48.25K, (Xi - Xbar)2 =575.50. What is the coefficient of variation? Choices are $71.94K, 18.79%, 0.1879% and $82.21K

10. Historically, the average grade of final exams in a design course in engineering department is 174 with standard deviation of 14. For the course that is running this semester, Ms. Smith, the course instructor, marked five exam papers having the following grades: 155, 179, 175, 175,161. Assuming the approximately normal distribution of results

For a normal distribution, verify that the probability (rounded to two decimal places) within a. 1.97 standard deviations of the mean equals 0.95. b. 0.53 standard deviations of the mean equals 0.40. c. Find the probability that falls within 0.33 standard deviations of the mean. d. Sketch these three cases on a single graph. Click here to view

Questions: Complete this worksheet. Are the results of the calculations, correct? How logical and complete are your explanations? Scenario A manufacturer of vehicles has found that they underestimated their total budget for freight charges even though the actual average cost per car and the estimated average cost per car were the same. Help them

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