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The instructor takes a random sample of size from the population data and obtains the following sample data:
| x |
| 405 |
| 385 |
| 495 |
| 385 |
| 555 |
| 470 |
| 7 | The variance of sample means is: | ||
| a | 4784.17 | ||
| b | 8085.10 | ||
| c | 1347.52 | ||
| d | 1418.44 |
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- SCENARIO 3 Two samples each of size 25 are taken from independent populations assumed to be normally distributed with equal variances. The first sample has a mean of 35.5 and a standard deviation of 3.0 while the second sample has a mean of 33.0 and a standard deviation of 4.0. Referring to Scenario 3. the pooled (i.e., combined) variance is ________A study was designed to compare the attitudes of two groups of nursing students towards computers. Group 1 had previously taken a statistical methods course that involved significant computer interaction. Group 2 had taken a statistic methods course that did not use computers. The students' attitudes were measured by administering the Computer Anxiety Rating Scale (CARS). A random sample of 1010 nursing students from Group 1 resulted in a mean score of 55.755.7 with a standard deviation of 7.97.9. A random sample of 1515 nursing students from Group 2 resulted in a mean score of 65.665.6 with a standard deviation of 6.16.1. Can you conclude that the mean score for Group 1 is significantly lower than the mean score for Group 2? Let μ1�1 represent the mean score for Group 1 and μ2�2 represent the mean score for Group 2. Use a significance level of α=0.05�=0.05 for the test. Assume that the population variances are equal and that the two populations are normally distributed. Step 3 of 4:…7 In interval estimation of a population parameter, increasing the sample size would a reduce the margin of sampling error, increasing the confidence level. b reduce the margin of sampling error, making the interval estimate more precise. c reduce the margin of sampling error, diminishing the error probability. d increase the margin of sampling error, making the interval estimate more precise.
- Students in the population of all students taking E270 were asked to state how much they spent on textbooks in the current semester. Jse the following textbook expense data (in dollars) to answer the following 5 questions. 475 550 540 350 330 510 335 530 370 455 525 545 515 435 335 485 540 645 435 405 340 470 455 345 650 375 520 275 465 330 555 460 455 380 520 620 580 335 565 420 510 465 540 545 350 410 440 530 505 455 655 520 360 405 325 525 545 350 450 435 265 385 540 465 460 560 495 530 385 685 470 375 545 555 520 490 440 495 570 370 340 435 360 590 550 430 425 390 490 430 665 610 655 410 560 390 365 595 550 385 440 395 395 505 545 430 575 530 415 265 420 470 350 525 325 620 325 525 505 335 490 560 240 425 460 435 280 510 485 510 665 335 430 375 555 445 460 490 360 420 470 425 410 680 295 415 230 475 430 395 370 380 375 490 410 330 610 430 305 590 605 315 485 400 480 375 500 445 310 455 355 575 310 370 265 415 345 575 395 385 650 540 435 380 380 495 460 370 400 550 575 385 555 535…Q3sssy In a sample of 134 ball bearings, the average diameter was found to be 3.78mm with a standard deviation of 0.44 . Give a point estimate for the population variance of the diameter of the ball bearings. Round your answer to two decimal places, if necessary.
- Air Quality Index is a way to measure particle pollution in the air. An index between 0 and 50 is considered good; between 51 and 100 is moderate; more 100 is considered unhealthy for sensitive groups and others. A recent sample data of air quality index values for Pomona in Southern California provided the following data. 50, 52, 59, 56, 58 What are the sample mean, sample variance and the sample standard deviation?Question Help Every ten years, the census bureau asks people about the number of people living within their households. The following list shows how eight households responded to the question. 3 6 6. 3 9. 4 4 a) Calculate the range. b) Calculate the sample variance. c) Calculate the sample standard deviation.A recent article in a business journal reported that the mean annual salary for graduates from 30 top MBA programs 10 years after graduation is $275,000 Assume the standard deviation is $54,500 24 Keep the error probability at α = 0.05. We want to build an interval which captures 95% of the sample means within ±$5,000 from the population mean. What is the minimum sample size that would yield such an interval? a 411 b 457 c 508 d 564
- The nutrition label for Oriental Spice Sauce states that one package of sauce has 1030 milligrams of sodium. To determine if the label is accurate, the FDA randomly selects 130 packages of Oriental Spice Sauce and determines the sodium content. The sample has an average of 1000.15 milligrams of sodium per package with a sample standard deviation of 271.69 milligrams. Step 1 of 2 : Calculate a 95% confidence interval for the mean sodium content in Oriental Spice Sauce. Round your answers to two decimal places.A cereal company checks the weight of its breakfast cereal by randomly checking 62 of the boxes. This particular brand is packed in 20-ounce boxes. Suppose that a particular random sample of 62 boxes results in a mean weight of 20.04 ounces. How often will the sample mean be this high, or higher if u = 20 and σ = 0.10 4
