8. A sample of difference scores from a repeated-experiment has a mean of M, = 4 with6.%3Dmeasuresa standard deviation of sa. If n = 4, is this sample sufficient to reject the nullhypothesis using a two-tailed test with a =b. Would you reject H if n = 16? Again, assume atwo-tailed test with a 05.= .05?1c. Explain how the size of thhe sample influences thelikelihood of finding a significant mean difference.9 When vou ceto curniויייויוייייוויויי'ןייןויוייוייויוןויוייייויוייויויויןיי

Answered: 8. A sample of difference scores IIUIII…

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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Q3: There is claim that the mean annual turnover rate of the 300 count bottle of B Aspirin is changed. Therefore a random sample of 33 is chosen that show the average is 10 and the standard deviation is 7. Use 0.05 significant level If the test statistics is -9, he claim mean is
Aspirin is packed in 120 tab bottles with weight normally distributed with mean 600g and standard deviation 6g. Rejected bottles are those whose weight differs from the mean weight by 15g or more. That is, rejected bottles have weight either too small or too large. We want to find out how many bottles will be rejected from a daily production of 5000 bottles. 1,Do we have to calculate one z-score or two z-scores? 2. The negative z-score is 3. The positive z-score is 4.How many bottles, of the 5000, do we anticipate to have to reject?
Researcher believe that the standard deviation in the crime rate is decreased by 30. To detect such a decrease in the standard deviation for the standard deviation of 190, power of.at leastQ.90. with the level of significance 0.03. Determine and report the required sample size to detect such a difference (decrease):| Enter a number. If the decrease in standard deviation was 20 instead of 30, would the required sample size be less or more? O more less
7. A sample of size N= 123 adults randomly selected, spent 8.20 hr/ week on the internet with a standard deviation of 6=9.84 hr. Construct a Confidence Interval of 95% for the population mean U the population mean hours for the internet ?
The melting point of a binder used in manufacturing a rocket propellant is approximately normally distributed, the mean is thought to be 100, and the standard deviation is 4. you wish to test HO: u=100 versus HI: uz100 with a sample of n= 16 specimens. suppose that the true mean melting point is 102. What is the probability of type ll error (B) for the two tail.test with a=0.05? Oa. 0,121999 b.0.4879 30.2439 Od.0.0615 Clear my.choICO
The people who survived the titani are more from lower class department than upper class department. A sample of 200 people of upper class department who survived with a mean age of 28 and standard deviation of 1.6 and a sample of 505 people of lower class department who survived with a mean age of 35 and standard deviation of 1.2.Test the hypothesis wih 0.05 level of significance?
The lengths of bolts produced in a factory may be taken to be normally distributed. The botlts are checked on two "go-no go" gauges and those shorter tthan 2.9 or longer than 3.1 inches are rejected. A random sample of 50 bolts are checked. If the n1 = 12 and n2 = 12, estimate the mean and the standard deviation for these bolts. State your assumptions. n1 being the number of bolts below 2.9 and n2 is the number of bolts above 3.1.
Suppose the mean IQ score of people in a certain country is 103. Suppose the director of a college obtains a simple random sample of 37 students from that country and finds the mean IQ is 107.4 with a standard deviation of 13.8. Complete parts (a) through (d) below. (a) Consider the hypotheses Ho: H= 103 versus H: u> 103. Explain what the director is testing. Perform the test at the a = 0.01 level of significance. Write a conclusion for the test. Explain what the director is testing. Choose the correct answer below. A. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually greater than 103. B. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually not equal to 103. O C. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually equal to 103. O D. The director is testing if the sample provided sufficient evidence that…
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