Two different types of injection-molding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300, are selected and 15 defective parts are found in the sample from machine 1 and 8 defective parts are found in the sample from machine 2.
What type of hypothesis test should you use to determine if both machines produce the same fraction of defective parts?
Group of answer choices
a) 2 Sample Prop T-Test
b) Paired T-Test
c) 2 Sample Z-Test
d) 2 Sample Prop Z-Test
Solution:
n1 = 300 , n2 = 300
x1 = 15 , x2 = 8
We are comparing two proportions.
So we use 2 sample Proportion test.
Z distribution is used to test the two proportions.
So , answer is
2 Sample Prop Z-Test
Option d) is correct.
Two different types of injection-molding machines are used to form plastic parts. A part is considered...
Question 3 1 pts Two different types of injection-molding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300, are selected and 15 defective parts are found in the sample from machine 1 and 8 defective parts are found in the sample from machine 2. What type of hypothesis test should you use to determine if both machines produce the same fraction of...
Two different types of injection-molding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300, are selected, and it was found that p1 -0.05 and p2 -0.01. Is it reasonable to conclude that both machines produce the same fraction of defective parts, using alpha = 0.057 Determine the sample size needed to detect this difference with a probability of at least 0.9 Use...
Two different types of injection- moulding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discoloured. Two random samples, each of size 300, are selected, and 15 defective parts are found in the sample from machine 1, and 8 defective parts are found in the sample from machine 2. Is it reasonable to conclude that both machines produce the same fraction of defective parts, using a 0.05, find the value...
22-23 D Question 22 4 pts Injection molding. Refer to this problem description for the next couple questions Two different types of injection-molding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300, are selected, and 17 defective parts are found in the sample from machine 1, while 12 defective parts are found in the sample from machine 2 Is it reasonable to...
10.6.3 Part 1 (Video Solution) Your answer is partially correct. Try again. Two different types of injection-molding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300, are selected, and 16 defective parts are found in the sample from machine 1, while 8 defective parts are found in the sample from machine 2. Is it reasonable to conclude that both machines produce the...
Question 5 1 pts Two types of plastics are suitable for an electronics component manufacturer to use. The breaking strength of this plastic is important. It is known that the standard deviations of the two types of plastics are the same, with a value of 1.0 psi. From a random sample of 10 and 12 for type 1 and type 2 plastics, respectively, we obtain sample means of 162.5 and 155. The company will not adopt plastic 1 unless its...
3. Two machines are used for filling plastic bottles with a net volume of 16.0 ounces. The fill volumes on both machines can be assumed to be normally distributed. The quality engineering department suspects that both machines fill to the same net volume, whether or not this volume is 16.0 ounces. An experiment is performed by taking a random sample from the output of each machine Machine 1 Machine 2 16.01 16.03 16.21 16.2 15.85 15.85 16.13 15.82 16.19 16.15...
Imagine that you wish to examine two sample means to decide if you can reject the hypothesis that µ1= µ2. The sample means are comprised of GPAs (grade point averages) that were collected from different, randomly chosen, students at two different universities. Which of the following types of tests should you use? Group of answer choices A z test A one-sample t test A paired-samples t test An independent-samples t test None of the tests listed above could be appropriate.
2side Hypothesis Testing_03 (two independent sam machines are used for filling plastic battle with a new volume of 16.0 ounces. The fill volume can be assumed was with standard deviations d. 0.020 and 0.025 ounces. A member of the quality engineering staff that both machines fill to the same mean net volume, whether or not this volume is 16.0 ounces. random sample of 10 bottles is taken from the output of each machine: Machine 01 16.03 16.01 16.04 15.96 16.05...
A facility for bottling soda uses two fill and seal machines. As part of quality control, data are periodically collected from random samples to test if the fill weight is the same for the two machines. A particular sample of 12 observations per machine were collected with the following summary statistics: (a) Conduct a hypothesis test to see if there is a difference in the mean fill amount of the machines Complete a hypothesis test. (b) Construct a 95% CI...