Statistics professors assume that individual records are normally distributed with ENTIRELY UN-KNOWN population variances, (01)² and (o2)². At the significance level, a = 0.01, do they have sufficientevidence that average undergraduate students' performance is BELOW that for graduate ones?• Evaluate Test Statistic• Indicate Critical Value required• State Rejection Rule• Formulate DecisionSolution12 Next TWO problems share the same summaries shown below.Comparison of students' performance was conducted. There were two equally sized groups of n1 = n2 = 10students (graduate and undergraduate ones). The summaries are shown below.GroupSizeMean = XSampie Variance = S2v = S²/nUndergraduaten1 = 9(X)ı = 67.50(S2)1 = 18vị = 2Graduaten2 = 9 (X)2 = 75.45(S2)2 = 63v2 = 711

Answered: Image /qna-images/answer/3fa129e1-9b6f-4d2a-a44f-cb8bbcd92d23.jpg

Answered: Statistics professors assume that…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Report summary statistics for the two variables ‘Run_Pulse’ and ‘Rest_Pulse’ in the table below: Sample Size Minimum Maximum Mean Median Standard Deviation Standard Error Run_Pulse Rest_Pulse
The processing times for cases at a certain office follow a bell-shaped model with mean 124 days and standard deviation 33 days. The processing time for a certain case was 179 days. Was this a typical processing time or was it unusually long? Typical, because it is less than 3 standard deviations away from the mean. O Unusually long, because it is more than 1 standard deviation away from the mean. Unusually long, because it is less than 3 standard deviations away from the mean. Unusually long, because it is not more than 2 standard deviations away from the mean. Typical, because it is not more than 2 standard deviations away from the mean. Typical, because it is more than 1 standard deviation away from the mean.
If the variance of the civil Engineering board examination result is 81, what is the minimum number of takers needed to estimate the population mean with 95% confidence using a margin of error of 0.44
5) A sample of 400 male students is found to have a mean height (55 + 18) inches. Can it be reasonably regarded as a sample from a large population with mean height 66 inches and standard deviation 1.30 inches? Test at 5% level of significance.
A random sample of 100 private companies locating in Ankara was asked to rate on a scale from 1 (not important) to 5 (extremely important) for having the practical knowledge of statistics as a good job candidate. The sample mean rating was 4.7. a)Test at the 5% significance level the null hypothesis that the population mean rating is less than or equal to 4.5 against the alternative that it is greater than 4.5. Population variance is known as 0.6. b)Compute p-value and explain what the calculated p-value means.
please answer quickly
22
A researcher was interested in whether there are differences in body image concerns between competitive vs. non-competitive athletes. Based on the forest plot below, what is your statistical conclusion? Difference in body image concerns between competitive and non- competitive athletes OA) Reject Ho Study Arroyo et al. (2008) Asci (2004) Benau et al., (2020) Di Bartolo & Shaffer (2002) Di Nucci et al, (1994) Filaire et al., (2007) Furnham et al, (1994) Hoag (2012) lacolino et al., (2017) Loosemore et al., (1989) Reinking & Alexander (2005) Robinson & Ferraro (2004) Souilliard et al., (2021) Souilliard et al., (2019) Warren et al, (1990) Wiggins & Moode (2000) Indicates lower levels of body image concerns among competitive athletes -2-1 C) Fail to Reject Ho HH Hedges g [95% CI) -0.54 (-1.08,-0.01] -0.26 [-0.40,-0.12] -0.28 [-0.53,-0.03] -0.69 (-0.97,-0.41] -1.01 [-1.52,-0.49] 2.29 [1.52, 3.06) -0.69 [-1.29,-0.09) 0.35 [0.12, 0.58]) -0.33 [-0.61,-0.05) 0.02 [-0.63, 0.67] -0.42 (-0.75,…
Suppose the mean weight of King Penguins found in an Antarctic colony last year was 15.4 kg. In a sample of 35 penguins same time this year in the same colony, the mean penguin weight is 14.6 kg. Assume the population standard deviation is 2.5 kg. At .05 significance level, can we reject the null hypothesis that the mean penguin weight does not differ from last year? Use P-value approach.
3) Last year, the mean running time for a certain type of flash light battery was 8.5 hours. This year, the manufacturer has introduced a change in the production method which he hopes will change the mean running time. A random sample of 40 of the new light bulbs was obtained and the mean running time was found to be 8.7 hours. Do the data provide sufficient evidence to conclude that the mean running time of the new light bulbs is different from last year's mean of 8.5 hours? Perform the appropriate hypothesis test using a significance level of 0.05. Assume that standard deviation of running time of all new light bulb batteries of this type is 0.5 hours.
3 - A water manufacturer claims that its product is 330 ML. The amount of water has a normal distribution. Quality manager takes 25 products every hour and calculate the amount of the water. The mean amount of water at 10:00 yields the average amount of 315 ML and variance of 9 ML. Test the claim that amount of the water in the bottles is at least 330 ML. Use significance level as 0.05. What is the hypothesis? What is the test statistics? If both of the answers are correct you got the points, otherwise you lose all points. (use two decimal) a ) 25.00 b) Но : и — 330 Н) : д + 330 c) Но : и 330 d) -8.33 e) O Ho : µ 330 f) 8.33 g) Η, : μ>330 Η : μ 330 O O O 0 0
3. Overa long period of time, it was found that the time taken for the standard physical task is normally distributed with mean 50 seconds, and variance 100 sec². A sample of 75 workers were given a special and unusual diet for three weeks before they were observed performing said standard physical task. The mean time taken by this sample is 46 seconds. Is this significant evidence that the special diet has made a difference in their performance. Use a 5%level of significance.

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