The probability (i) that A can solve a prob Statistics is 4/5, (ii) that B can solve it is 2/3, (iii) that C plve it is 3/7. İf all of them try independently, find the probabi at the problem will be solved.
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- Find solutions for your homework math statistics and probability statistics and probability questions and answers a company that translates books between various languages is currently testing a computer-based translation service. the founder of the company expects the computer program to make some errors, but then so do human translators. the computer error rate is supposed to be an average of 3 per 500 words of translation. suppose the company founder randomly selects This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer Question: A Company That Translates Books Between Various Languages Is Currently Testing A Computer-Based Translation Service. The Founder Of The Company Expects The Computer Program To Make Some Errors, But Then So Do Human Translators. The Computer Error Rate Is Supposed To Be An Average Of 3 Per 500 Words Of Translation. Suppose The Company Founder Randomly Selects…Business schools A and B reported the following summary of GMAT (Graduate Management Aptitude Test) mathematics scores. Test the claim that there is a difference in means between two schools A and B. (a) At α = 1%, use the Classical approach to conclude it. (b) Using the P-value approach to conclude it. Business school A : n=50, X bar=37, S2=100 Business school B : n=40, X bar= 33, S2 = 80Nathan has been quietly practicing his skills and is now an amazing dart player. At this point, he has a 70% chance to hit the bull’s eye on any given throw! Let’s assume that each throw of the dart is independent of another. Nathan decides to test himself and enters a Friday night dart tournament, he will have to throw 120 darts across several matches, let B = the number of bull’s eyes that he hits. 1.Check the criteria to show that B is a binomial random variable. 2.Check the conditions for using a Normal approximation in this setting 3. What’s the probability that Nathan will hit at least 75 bull’s eyes across the tournament?
- Dace is a political analyst for a presidential candidate (Aspirant A) with two strong competitors (Aspirants B and C). She analyzed that B and C have exactly the same chance of winning a seat while A has twice the chance of either B and C. With the given information, what is the chance of A in winning.A researcher wants to determine whether adolescents spend more time in a day around friends than adults do. He gathers a sample of n =10 adolescents (aged 12-17) and a sample of n =6 adults (aged 25-32). The researcher finds that the average time spent around friends for adolescents is M1= 3 hours with a SS1 of 44. He also finds that the average time spent around friends for adults is M2= 2 hours with a SS2 of 40. a. Do you use a one- or two-tailed test? What is the critical/cut-off t value with an alpha level of α = .01? b. What is the variance? c. What is the estimated standard error? d. What is the value of the t statistic? e. Do we reject or fail to reject the null hypothesis (α = .01)? Why? f. Calculate and report the variance explained ( r2)A company manufacturing CDs is working on a new technology. A random sample of 717 Internet users were asked "As you may know, some CDs are being manufactured so that you can only make one copy of the CD after you purchase it. Would you buy a CD with this technology, or would you refuse to buy it even ifit was one you would normaly buy?" Of hose usert, 56% responded that they would buy the CD. Complete parts a and b below a) Create a 90% confidence interval for this percentage 口口 (Round to three decimal places as needed, Use ascending order.)
- The term 'Boomerang Generation' refers to the recent generation of young adults who have had to move back in with their parents. In a 2012 survey, 198 out of 801 randomly selected young adults (ages 18-34) had to move back in with their parents after living alone. In a similar survey from the year 2000, 284 out of 1811 young adults had to move back in with their parents. The table below summarizes this information. The standard error (SE) is given to save calculation time. year total # who moved back (xx) total # in survey (nn) proportion p^=x/np^=x/n 2012 198 801 0.247191011235955 2000 284 1811 0.156819436775262 Standard Error: SE = 0.0164608118673214 Test the claim that a greater proportion of all young adults moved back in with their parents in 2012 than in 2000. Test this claim at the 0.05 significance level. (a) Find the test statistic. (b) Find the critical value. (c) Find the pp-value. (d) Is there sufficient data to support the claim?YesNo Can you support the…An experiment was conducted to test whether classical music helps with mathematical performance. To study this, participants (n=9) were given an algebra test. Half of the sample completed the test in a room with classical music playing while the other half completed it in a room with no sounds at all. After a brief rest, the two groups switched rooms and completed a slightly modified version of the algebra test. Thus, all participants experienced both conditions. The scores for the two conditions were then compared, showing that listening to classical music did help mathematical performance by an average of MD =2 points with SS =32. a. Calculate the estimated standard error. b. Compute the t statistic and state the conclusion of these findings.A gambler simulates a new card game on a computer. Out of 500 trials he wins 200 times. So he calculates P(winning) = 200/500 = 0.40. Why is this only an estimate of the true value of P(winning)? A. There are more than 2 events B. The outcomes are not equally likely C. His estimate is not rounded to 3 decimal places D. If he were to do a different set of 500 trials, he might win 180 times and calculate a different value of P(winning)
- Research has shown that losing even one night’s sleep can have a significant effect on performance ofcomplex tasks such as problem solving (Linde &Bergstroem, 1992). To demonstrate this phenomenon,a sample of n=25 college students was given aproblem-solving task at noon on one day and again atnoon on the following day. The students were notpermitted any sleep between the two tests. For eachstudent, the difference between the first and secondscore was recorded. For this sample, the studentsaveraged MD=4.7 points better on the first test with avariance of s2=64 for the difference scores. a.Do the data indicate a significant change in problem-solving ability? Use a two-tailed test with a= .05. b.Compute an estimated Cohen’s dto measure thesize of the effectAn experiment was conducted to test whether classical music helps with mathematical performance. To study this, participants (n=9) were given an algebra test. Half of the sample completed the test in a room with classical music playing while the other half completed it in a room with no sounds at all. After a brief rest, the two groups switched rooms and completed a slightly modified version of the algebra test. Thus, all participants experienced both conditions. The scores for the two conditions were then compared, showing that listening to classical music did help mathematical performance by an average of MD =2 points with SS =32. a. Using symbols, state the hypotheses for a two-tailed test with α=0.01. b. Identify the degrees of freedom and the critical regions. c. Calculate the sample variance.
