Monday
September 15, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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statistics
A random sample of 8 male college students was taken and asked to report their shoe size and height in inches
Sunday, September 14, 2014 at 11:52pm

statistics
Air travel is probably not as fun as it used to be. Airlines have increased fares, reduced seat size, and now charge fees for everything from luggage to early boarding. Airlines can be fined by the federal transportation agencies for various "infractions". One issue ...
Sunday, September 14, 2014 at 10:18pm

Statistics
If you have a curve with an asymmetric bimodal distribution, is it considered a normal distribution? Or is it only a normal distribution if there is a single bell-shaped curve?
Sunday, September 14, 2014 at 9:28pm

statistics
AAA reports that the average age of a car on U.S. roads in recent years has risen to 7.5 years. Suppose that the distribution of the age of automobiles assumes a mound shaped distribution. If 99.7% of the ages are between 1 year and 14 years, what is the value of the standard ...
Sunday, September 14, 2014 at 9:16pm

Elementry Statistics
The census figures show that the average income for a family in a rural region is approximately $34,860 per year. A random sample has a mean income of $33,566 per year, with a standard deviation of $1,245. At a sig. level of .0.01 is there enough evidence to reject the claim?
Sunday, September 14, 2014 at 6:02pm

statistics
You have just completed a round trip to New York and back by car. The one way distance traveled is 210 miles. If your average speed traveling to New York was 70 miles per hour and your average speed returning to Baltimore was 50 miles per hour (heavy traffic) what was your ...
Sunday, September 14, 2014 at 5:02pm

Statistics
12 cards are drawn with replacement from an ordinary deck of 52 cards. What is the probability that 4 queens of hearts, 4 aces of spades, and 4 kings of clubs are drawn?
Sunday, September 14, 2014 at 4:45pm

statistics
You have just completed a round trip to New York and back by car. The one way distance traveled is 210 miles. If your average speed traveling to New York was 70 miles per hour and your average speed returning to Baltimore was 50 miles per hour (heavy traffic) what was your ...
Sunday, September 14, 2014 at 4:21pm

Statistics
Each day a local radio station randomly draws a date (without replacement) from a bowl containing all the days in the year. The first person who calls in with their birthday on the date drawn gets a prize. what is the probability that none of the birthdays selected in the ...
Sunday, September 14, 2014 at 1:24pm

Statistics
If P(A/B)=1 must A=B?
Sunday, September 14, 2014 at 12:02pm

statistics; emergency please help me
Air travel is probably not as fun as it used to be. Airlines have increased fares, reduced seat size, and now charge fees for everything from luggage to early boarding. Airlines can be fined by the federal transportation agencies for various "infractions". One issue ...
Saturday, September 13, 2014 at 10:05pm

statistics
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 13 hours, with a standard deviation of 2.5 hours. It is desired to estimate the mean viewing time within two-quarter ...
Saturday, September 13, 2014 at 12:38pm

Statistics
The following are weights (in lbs) for a sample of 11 baby boys at the age of 18 months: 21.8 22.2 23.4 24.6 25.1 26.7 27.3 28.0 29.8 30.9 31.2 What is the 80th percentile estimate for these sample?
Friday, September 12, 2014 at 8:53pm

Statistics – Lab Week 2
11. Using the empirical rule, 68% of male heights should be between what two values? Either show work or explain how your answer was calculated.
Friday, September 12, 2014 at 7:29pm

Statistics
In a survey of 80 high school football players who committed to play in the Division III CCIW conference, 64 said that they would work out in their high school weight rooms in the summer before college. The margin of error for the survey was 6%. A census of all CCIW football ...
Friday, September 12, 2014 at 1:04pm

Statistics
1. A poll of 700 persons attending the Taste of Chicago showed that 455 persons, 65% of the sample, believed that the food was overpriced. It is estimated that 1,250,000 persons attend the Taste. Statistics suggest that, although 65% plus or minus 5% of attendees believe that ...
Friday, September 12, 2014 at 12:49pm

statistics
What is the mathematical relationship between the confidence level and the level of significance, α? Can you explain this to me in an easy to understand way? Thank you
Thursday, September 11, 2014 at 8:02pm

statistics
Let E and F be two events for which the probability of atleast one of them occurs is 3/4. what is the probability that neither E nor F will occur.
Thursday, September 11, 2014 at 5:59pm

Statistics
One month before a recall election, a poll of 500 Wisconsin voters showed that 46% planned to vote for the Democratic challenger Tom Barrett and 45% planned to vote for Republican Governor Scott Walker. Undecided voters constituted another 9%. The margin of error was 5 ...
Thursday, September 11, 2014 at 4:07pm

Statistics
A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for its use and a planned diet for six weeks. The ...
Thursday, September 11, 2014 at 1:53pm

Statistics
The father of a junior high school student wants to determine the most popular book among junior high students. Select the sample with the least potential bias. A. A randomly selected group of 10 book sellers B. A randomly selected group of 30 junior high students C. A ...
Thursday, September 11, 2014 at 1:34pm

Statistics
A poll was taken of a random sample of 1189 college students. Of these students, 789 reported that they had a drinking binge (more than 10 drinks in an evening) in the past month. Select the most believable conclusion. A. About 66.358% of college students indulged in binge ...
Thursday, September 11, 2014 at 1:15pm

statistics
In this question, use Excel functions rather than Normal distribution tables. The number of new cars sold by "Ma's New Car Factory" in a financial year can be approximated by a normal distribution with a mean of 125,000 cars and a standard deviation of 34,000 ...
Thursday, September 11, 2014 at 10:48am

statistics
A researcher hypothesizes that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability, (u = 58). A random sample of 14 individuals who listen to classical music is ...
Thursday, September 11, 2014 at 9:34am

statistics
Henry performed a two- tailed test for an experiment in which N = 24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to compare his tobt with this tcv. Is he more likely to make a Type I or a Type II error in this situation?
Thursday, September 11, 2014 at 9:08am

statistics
Let E and F be two events for which the probability of atleast one of them occurs is 3/4. what is the probability that neither E nor F occurs? The hint is to use Demorgan's laws
Wednesday, September 10, 2014 at 5:02pm

statistics
each of 10 men questioned 100 individuals whether X is a singer. If the answer yes has the probability 0.5. what is the number of individuals who answers assertively?
Wednesday, September 10, 2014 at 5:39am

statistics
Given a normally distributed population of values with a mean of 76 and a standard deviation of 10 what is the probability that a value is 71 and 82
Tuesday, September 9, 2014 at 10:51am

math
how do i calculate for class midpoint under statistics?
Tuesday, September 9, 2014 at 10:25am

statistics
The average one-way commute time for a random sample of 256 area residents of a city is 90 minutes, with a standard deviation of 24 minutes. Construct a 90% confidence interval for the mean commute time of all residents. Construct a 98% confidence interval for the mean commute...
Monday, September 8, 2014 at 10:19pm

statistics
It is time to go shopping for new clothes for school! You have found a catalog for new clothes. You decide that you will buy ve di erent shirts, four di erent pants, two di erent jackets, and three di erent shorts. The catalog has twelve di erent types of ...
Monday, September 8, 2014 at 9:58pm

statistics
Is 28.065 more or less than 28.506
Monday, September 8, 2014 at 4:56pm

statistics
At a local college, 81 of the male students are smokers and 729 are non-smokers. Of the female students, 350 are smokers and 350 are non-smokers. A male student and a female student from the college are randomly selected for a survey. What is the probability that both are ...
Monday, September 8, 2014 at 1:23pm

Statistics
Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week (round answer to the nearest...
Monday, September 8, 2014 at 9:16am

Statistics
Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 68 percent of SOC 390 students work between ______ and ______ hours per week.
Monday, September 8, 2014 at 9:15am

statistics
there are 450 employee in an organization. using the method of random sampling numbers, select a sample of 20 employees
Monday, September 8, 2014 at 8:28am

statistics
A study was conducted in which the teachers were asked to rate students for a particular trait on a ten point scale. With the help of data given below find out whether significant difference exists in the rating of the students by the teachers. Teachers Students A B C D E F G ...
Monday, September 8, 2014 at 4:33am

statistics
A statistical analysis firm is hired to analyze the failure rate of a manufactured product. Which margin of error below would best indicate that the data used by the firm is a valid representation of the population? I don't understand the question they're asking me. ...
Sunday, September 7, 2014 at 6:11pm

statistics
Determine the probability that the single card drawn from a standard 52-card deck is a four, a five, or a spade. Illustrate the probabilities using a Venn Diagram
Saturday, September 6, 2014 at 9:45pm

statistics
At a school consists of 62% undergraduate, 55% of the students are males, and 48% of the undergraduate students are male. a. Determine the probability that a randomly selected student is either male or an undergraduate b. Illustrate the probabilities using a Venn Diagram
Saturday, September 6, 2014 at 9:45pm

statistics
Define the concept of independent events with regards to probability. Provide an example of an event that is independent and an event that is not independent
Saturday, September 6, 2014 at 9:44pm

statistics
A survey was conducted at a school to determine how many students use the outside recreational areas for studying versus recreational. Out of 43 students at the park 25 students were not studying. What is the probability that you would come across a student studying at the park?
Saturday, September 6, 2014 at 9:44pm

statistics
Define each of the following probability terms for the scenario of determining the probability that when a couple has 3 children, they will have exactly 2 boys. Assume that boys and girls are equally likely and that the gender of any child is not influenced by the gender of ...
Saturday, September 6, 2014 at 9:43pm

Statistics
Event A occurs with probability 0.1 and event B with probability 0.5 A) What is the maximum probability that the intersection of A and B can have? B) What is the minimum probability that the intersection of A and B can have? C) If it is know that P(A complement and B ...
Saturday, September 6, 2014 at 10:48am

statistics
How do I go about finding the answer to this type of question? Find the standard score (z) for which 50% of the area under the normal curve is below the mean.
Friday, September 5, 2014 at 6:59pm

statistics
Four girls (say I, II, III and IV) are to rank 3 different types of cake (say A, B and C) in a blindfold test. Each girl ranks the three cakes as 1 (for the cake she likes the best), 2 and 3, and then the assigned ranks of each type of cake are summed. Assume that each girl is...
Friday, September 5, 2014 at 12:35pm

statistics
An urn contains 10 balls of which 6 are white, 3 are red and 1 is green. Two balls are drawn at random from the urn. Find the probability distribution of number of white balls drawn. Hence state the expected number of white balls one can get in such a draw.
Friday, September 5, 2014 at 12:31pm

statistics
let E,F and G be three events. state expressions fo rthe events. a. only F occurs b. exactly two of the events occur. c. at leasat one of the events occur. d. E and G occur but F does not. how do I go about writing these. do I use like union and intersection?
Friday, September 5, 2014 at 7:55am

statistics
There are four children of di erent ages in a family. Their mom purchases six di erent gifts and decides to divide the gifts randomly between the children. Assuming that a child can receive no gift or multiple gifts, Thinking only about the number of gifts received by ...
Friday, September 5, 2014 at 4:31am

statistics
The mean height of students in a college is 155 cms and standard deviation is 15. What is the probability that the mean height of 36 students is less than 157 cms
Thursday, September 4, 2014 at 5:08pm

Statistics
A sample of 12 measurements has a mean of 37 and a standard deviation of 4.25. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 37 each. A. Find the mean of the sample of 14 measurements. Mean = 37 How I ...
Thursday, September 4, 2014 at 3:12pm

statistics
A state administered standardized reading exam is given to eighth grade students. The scores on this exam for all students statewide have a normal distribution with a mean of 507 and a standard deviation of 60. A local Junior High principal has decided to give an award to any ...
Thursday, September 4, 2014 at 11:40am

statistics
Assign your numbers for mean μ and standard deviation σ. Then select one number "a" bellow μ and one number "b" above μ. Choose these numbers not far from μ so we can use z. Find probability that x is between a and b: P(a < x <...
Thursday, September 4, 2014 at 11:19am

statistics
A state administered standardized reading exam is given to eighth grade students. The scores on this exam for all students statewide have a normal distribution with a mean of 506 and a standard deviation of 69. A local Junior High principal has decided to give an award to any ...
Thursday, September 4, 2014 at 10:06am

statistics
The final mark in QTQ100T has a normal distribution with an average of 60% and a variance of 100. If we draw a sample of 4 students, the probability that the average mark is more than 56% is
Thursday, September 4, 2014 at 5:19am

statistics
24. Rosalie Friend (2001), and educational psychologist, compared three methods of teaching writing. Students were randomly assigned to three different experimental conditions involving different methods of writing a summary. At the end of the two days of instructions, ...
Tuesday, September 2, 2014 at 11:36pm

statistics
24. Rosalie Friend (2001), and educational psychologist, compared three methods of teaching writing. Students were randomly assigned to three different experimental conditions involving different methods of writing a summary. At the end of the two days of instructions, ...
Tuesday, September 2, 2014 at 11:29pm

statistics
What is the standard deviation of a $1 bet on any one particular number, e.g., 33, in the game of American roulette? Notice the payoff is 35:1 for this type of bet.
Tuesday, September 2, 2014 at 9:27pm

statistics
Which interval describes the number of hours spent studying in a typical week for about 50% of the students sampled? 2 to 9 9 to 14 9 to 20 14 to 20 A five number summary of respones is: 2,9, 14, 20, 60
Tuesday, September 2, 2014 at 12:24pm

Writing Skills
1. What do we call an idea that will make the reader take notice and want to read on? A. Card B. Summary C. Hook D. Point of view Student Answer: B Answer: Incorrect Reference: 3. The most important difference between an outline and finished writing is the A. details. B. ...
Monday, September 1, 2014 at 4:48pm

statistics
How many TV's are there in your household?” was one of the questions on a questionnaire sent to 5000 people in Japan. The collected data resulted in the following distribution: Number of TVs/Household 0 1 2 3 4 5 or more Percentage 1.9 31.4 23.0 24.4 13.0 6.3 One of ...
Saturday, August 30, 2014 at 12:35am

Business statistics
For a batch of apples containing 100 apples the mean mass is 8 gm. For half number of apples selected from 100 apples the mean mass is 10 gm. Find the mean mass of other half number of apples
Thursday, August 28, 2014 at 7:00am

Business statistics
For a batch of apples containing 100 apples the mean mass is 8 gm. For half number of apples selected from 100 apples the mean mass is 10 gm. Find the mean mass of other half number of apples
Thursday, August 28, 2014 at 3:36am

Statistics
1. The average time it takes for a cellphone to reboot is 3 minutes with a standard deviation of 10 seconds. The average time it takes a computer to restart is 5 minutes with a standard deviation of 15 seconds. Both are normally distributed. Suppose that a cellphone and a ...
Wednesday, August 27, 2014 at 7:27am

statistics
An urn contains 10 balls of which 6 are white, 3 are red and 1 is green. Two balls are drawn at random from the urn. Find the probability distribution of number of white balls drawn. Hence state the expected number of white balls one can get in such a draw.
Wednesday, August 27, 2014 at 6:30am

statistics
Four girls (say I, II, III and IV) are to rank 3 different types of cake (say A, B and C) in a blindfold test. Each girl ranks the three cakes as 1 (for the cake she likes the best), 2 and 3, and then the assigned ranks of each type of cake are summed. Assume that each girl is...
Wednesday, August 27, 2014 at 6:29am

Statistics
use the stem-and leaf plot below to answer questions 11-13. Assume that 30/0=300 30/0 31/2 2 32/1 5 33/0 3 6 34/4 5 7 8 35/1 1 2 9 How many numbers are in the original data set? 6 16 22 9 What is the largest number in the data set? 9 22 35 359 If this data were put into a bar ...
Tuesday, August 26, 2014 at 2:31pm

statistics
The number of new boats sold at a boat dealership in a given week qualitative/nominal qualitative/ordinal quantitative/continuous quantitative/discrete the weight of a gemstone qualitative/nominal qaulitative/ordinal quantitative/continuous quantitative/discrete The make of a ...
Tuesday, August 26, 2014 at 12:00pm

statistics
According to a survey, only 20% of customers who visited the web site of a major retail store made a purchase. Random samples of size 50 are selected.Tthe mean of all the sample proportions of customers who will make a purchase after visiting the web site is _
Monday, August 25, 2014 at 11:27am

Statistics
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability of success on a single trial, n=9, x=2, p=0.35.
Monday, August 25, 2014 at 5:34am

statistics
The selling of prices Of six second hand bicycles in relation to their ages were noted for advertisements appearing in a local newspaper . The details are given in the table bellow. Age x ( years) 4 10 2 1 3 4 Price, y. 9 1 14 18 12 7 ( a) calculate the value of the product - ...
Saturday, August 23, 2014 at 6:11pm

statistics
A study is being made of the failures of an electronic component. There are four types of failures possibly and two mounting positions for the device. The following data have been taken; FAILURE A. B. C. D M. Position 1 22 46 18 9 M. Position 2. 4 17 6 12 Test the hypothesis ...
Saturday, August 23, 2014 at 5:59pm

statistics
In a certain city, a fast food chain feels it is giving a bad reputation because it takes too long to serve the customer. Since the chain had four restaurants in this town, it is concerned with whether all restaurants have the same average servicing time. One of the owners of ...
Saturday, August 23, 2014 at 5:48pm

statistics
Your muffler factory claims to manufacture mufflers with a lifespan of more than 10000 miles of usage. A consumer group tests this claim at the 95 percent significance level, and finds that a sample of 64 mufflers have a mean lifespan of 10002 miles, with a standard deviation ...
Saturday, August 23, 2014 at 4:51pm

Statistics
The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?
Friday, August 22, 2014 at 3:43am

statistics
The average weight of all newborn babies at Dearborn Hospital was estimated by using the average weight of babies born in the month of April. Based on this information, identify: a. A statistic b. A variable c. A data value
Friday, August 22, 2014 at 12:57am

statistics
A certain number of articles manufactured in a batch were classified into three categories according to some particular characteristic, being less than 50, between 50 and 60 and greater than 60. If this characteristic is known to be normally distributed, determine the mean and...
Thursday, August 21, 2014 at 8:35am

AP Statistics
A study sought to determine whether the ancient Chinese art of acupuncture could help infertile women become pregnant. 160 healthy women undergoing treatment for infertility were recruited for the study. Half of the subjects were randomly assigned to receive acupuncture ...
Wednesday, August 20, 2014 at 7:51pm

inferential statistics
A supplier of company X makes on an average of 5 defective pieces. The company accepts a sample if there are no more than 7 defective pieces. What are the chances that the company will reject the sample?
Tuesday, August 19, 2014 at 11:38pm

Business Statistics
You wish to learn the average age of an MBA student within 2 years and with 99% confidence. How large of a sample should you get? Based on data from student_data.xls This is what I have so far. I don't know what the standard deviation would be N= [ZS/E]^2 N= [ 2.5758*s/2] ^ 2
Tuesday, August 19, 2014 at 11:03pm

statistics
describe the distribution of the data with regard to the shape, outliers, center, and spread.
Tuesday, August 19, 2014 at 6:28pm

Statistics
suppose 60 people are asked which method is best to avoid getting the flu. the results are shown in the table below. determine the percentage for each method and complete the table. round to the nearest whole number. Method Frequency % Flu shot 15 washing hands 36 taking ...
Tuesday, August 19, 2014 at 6:01pm

statistics
The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small Too Large Total Low Income 19 21 40 High Income 22 13 35 Total 41 34 75 Q: If 100 children are chosen at random, it would be unusual if more ...
Tuesday, August 19, 2014 at 11:54am

statistics
Construct the cost of living index number for private university teacher for the year august 2014 considering august 2013 as the base period.
Tuesday, August 19, 2014 at 1:37am

statistics
If a milk cow in California produced a mean of 1,875 pounds of milk per month, what percentage of production would that cow be in compared to the overall production per milk cow in California from 1990 through 2005?
Tuesday, August 19, 2014 at 12:57am

statistics
population has mean 53 and standard deviation 12. Calculate the standard deviation of x bar for a random sample of size 12.
Monday, August 18, 2014 at 7:12pm

statistics
The number of hours that college students sleep on a week night is approximated by a normal curve with a mean of 7 hours and a standard deviation of 1.7 hours. Answer the question below using a z table: On a week night, what percentage of students sleep between 5 and 10 hours
Monday, August 18, 2014 at 9:27am

statistics
The number of vacation days taken by employees of a company is normally distributed with a mean of 14 days and a standard deviation of 3 days. For the next employee, what is the probability that the number of days of vacation taken is less than 10 days? More than 21 days?
Sunday, August 17, 2014 at 11:16pm

Statistics in Psychology
What is a proper Null and Alternative HypothesThe CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study ...
Sunday, August 17, 2014 at 7:12pm

Statistics
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study collected current salary data of the three groups ...
Sunday, August 17, 2014 at 6:40pm

statistics
In performing a hypothesis test, the null hypothesis is population mean = 6.9 and the alternative hypothesis is population mean ≠ 6.9, a random sample of 16 items is selected. The sample mean is 7.1 and the sample standard deviation is 2.0. The population is ...
Sunday, August 17, 2014 at 8:09am

Research Statistics
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study collected current salary data of the three groups ...
Saturday, August 16, 2014 at 1:29am

Statistics
Six homes are randomly surveyed from a group of fifteen homes. How many different random samples are possible
Thursday, August 14, 2014 at 3:15am

statistics
4. The average family income in the town of Seneville is $45 000, with a standard deviation of $9000. Assuming that family income is normally distributed, determine the income level below which 80% of the families in this town earn
Wednesday, August 13, 2014 at 8:28pm

statistics
You want to estimate the difference in grade point averages between two groups of university students to be accurate within 0.2 grade point, with probability approximately equal to 0.95. If the standard deviation of the grade point measurements is approximately equal to 0.6, ...
Wednesday, August 13, 2014 at 2:43pm

statistics
in a beach side suburb it rains on 20% of days and is windy on 30% of days. if rain and wind are independent, on any particular day find the probability that: (a) it rains and is windy (b) it does not rain and is not windy (c) it rains or it windy (d) it does not rain or is ...
Wednesday, August 13, 2014 at 12:28pm

statistics
1) One hundred clients of a registered tax agent fall into the categories of personal (25 male, 30 female), corporate (10 male, 15 female) and small business (8 male, 12 female). The agent selects one of the clients at random to begin work. Find the probability that the client...
Wednesday, August 13, 2014 at 11:33am

statistics
A research organization claims that the monthly wages of industrial workers in district X exceeds that of those in district Y by more than Rs 150. Two different samples drawn independently from the two district yielded the following results: District X: 1 x = 648, 2 1 s = 120...
Wednesday, August 13, 2014 at 9:21am

statistics
150 students is 60 kg the mean of body is 70 kg withstandard deviation of 10 kg and mean weight of girls is 55 kg with standard deviation of 15kg.calculate the number of boys and the combined standard deviation. Also find whether the coefficient of deviation is hired for girls...
Monday, August 11, 2014 at 3:51pm

statistics
Advertisers contract with Internet service providers and search engines to place ads on websites. They pay a fee based on the number of potential customers who click on their ad. Unfortunately, click fraud—the practice of someone clicking on an ad solely for the purpose ...
Monday, August 11, 2014 at 1:58am

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