A company manufactures metal nuts and washers. Company claims that the variance diameter of washers is...
A company manufactures metal nuts and washers. Company claims that the variance diameter of washers is greater than 0.27 cm. In order to test this claim 25 washers are collected from the production line at random. Average diameter of the sample washers is found to be 4.5 cm with sample variance 0.32 cm. Find the test value to test this claim.
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A company manufactures metal nuts and washers. Company claims
that the variance diameter of washers is...
A company claims that each batch of its deluxe mixed nuts contains 52% cashews, 27% almonds,...
A company claims that each batch of its deluxe mixed nuts contains 52% cashews, 27% almonds, 13% macadamia nuts, and 8% brazil nuts. To test this claim, a quality control inspector takes a random sample of 150 nuts from the latest batch. Test the company’s claim at significance level 0.05. (Goodness-of-fit). Nut Cashew Almond Macadamia Brazil Count 83 29 20 18
Please answer this. Thank you 1. A company manufactures gas bottles for industrial use and claims...
Please answer this. Thank you
1. A company manufactures gas bottles for industrial use and claims that the average hours of use is 500 hours. A purchaser of these bottles doubts the claims and believes the use time is less than 500 hours. To test the manufacturers, claim the purchasing agent randomly selects six of these gas bottles from the manufacturer and finds that the sample average is 493 hours with a sample standard deviation of4 hours Assuming that the...
3. A manufacturing company that produces shafts claims that one of the machined shafts has a...
3. A manufacturing company that produces shafts claims that one of the machined shafts has a diameter variance no larger than 0.0002 in'. A random sample of 10 shafts is collected and measured resulting in a sampled variance of 0.0003 in'. Assuming normality in the diameter measurements, is there significant evidence to refute the company's claim? Use a level of significance a = 0.05. Start your solution by clearly stating the null and alternative hypotheses, show all your calculations and...
1. A bearing used in an automotive application is supposed to have a nominal inside diameter...
1. A bearing used in an automotive application is supposed to have a nominal inside diameter of 3.81 cm. A random sample of 25 bearings is selected and the average inside diameter of these bearings is 3.8037 cm. Bearing diameter is known to be normally distributed with standard deviation σ 0.03 cm. (a) Compute a 95%-confidence interval for the mean inside diameter. (b) Test the hypothesis H0 : μ = 3.81 versus H1 : μ关3.81 using α-001. What is the...
An orthodontist claims that their average cost for teeth straightening with metal braces is less than...
An orthodontist claims that their average cost for teeth straightening with metal braces is less than the state average of $5400. To test this claim the orthodontist randomly selects 18 patients and found that mean cost was $5250 with a standard deviation of $629 Compute the p-value and round to 3 significant decimal places..
An electrical firm manufactures a certain type of LED light bulb and claims that the average bulb lifetime is at least 800 hours
An electrical firm manufactures a certain type of LED light bulb and claims that the average bulb lifetime is at least 800 hours. To test this, a random sample of 60 bulbs is taken. The average life of the sample is found to be 788 hours with a standard deviation of 40 hours.(a) At a level of 0.05 significance, is there compelling evidence to doubt the comp any's claim? Be sure to state the appropriate hypotheses, and specify the rejection...
Suppose a batch of metal shafts produced in a manufacturing company have a variance of 99...
Suppose a batch of metal shafts produced in a manufacturing company have a variance of 99 and a mean diameter of 207207 inches. If 7272 shafts are sampled at random from the batch, what is the probability that the mean diameter of the sample shafts would differ from the population mean by less than 0.30.3 inches? Round your answer to four decimal places.
A life insurance company has recently restructured jobs in their claims processing division. A main goal...
A life insurance company has recently restructured jobs in their claims processing division. A main goal of the change was to decrease the amount of time to process claims. Prior to the restructure, claims took an average of 14.5 work days to process. To test the effectiveness of the new job structure, the division manager collected a random sample of 100 claims 6 months after the restructure and found that they took an average of 12.7 work days to process,...
(2) A state executive claims that the average cost of tuition at public colleges is $5700....
(2) A state executive claims that the average cost of tuition at public colleges is $5700. A researcher wishes to test the claim that this cost is greater than $5700. She selects a random sample of 36 public colleges and finds the mean to be $5950.The population standard deviation is $659. Is there enough evidence to support the claim that the cost of tuition is greater than $5700 at a 0.05?
20. (8 points) A company claims that the variance of the sugar content of its yogurt...
20. (8 points) A company claims that the variance of the sugar content of its yogurt is less than or equal to 25. A sample of 20 servings is selected, and the sugar content is measured. The variance of the sample is found to be 36. Ata = 0.10 test the claim. Use Traditional method. For One Population: Show your work for finding Test value, Critical value(s), or P-value. For Two Populations: Use your calculator to give the values of...
Please answer this. Thank you
1. A company manufactures gas bottles for industrial use and claims that the average hours of use is 500 hours. A purchaser of these bottles doubts the claims and believes the use time is less than 500 hours. To test the manufacturers, claim the purchasing agent randomly selects six of these gas bottles from the manufacturer and finds that the sample average is 493 hours with a sample standard deviation of4 hours Assuming that the...
3. A manufacturing company that produces shafts claims that one of the machined shafts has a diameter variance no larger than 0.0002 in'. A random sample of 10 shafts is collected and measured resulting in a sampled variance of 0.0003 in'. Assuming normality in the diameter measurements, is there significant evidence to refute the company's claim? Use a level of significance a = 0.05. Start your solution by clearly stating the null and alternative hypotheses, show all your calculations and...
1. A bearing used in an automotive application is supposed to have a nominal inside diameter of 3.81 cm. A random sample of 25 bearings is selected and the average inside diameter of these bearings is 3.8037 cm. Bearing diameter is known to be normally distributed with standard deviation σ 0.03 cm. (a) Compute a 95%-confidence interval for the mean inside diameter. (b) Test the hypothesis H0 : μ = 3.81 versus H1 : μ关3.81 using α-001. What is the...
A life insurance company has recently restructured jobs in their claims processing division. A main goal of the change was to decrease the amount of time to process claims. Prior to the restructure, claims took an average of 14.5 work days to process. To test the effectiveness of the new job structure, the division manager collected a random sample of 100 claims 6 months after the restructure and found that they took an average of 12.7 work days to process,...
20. (8 points) A company claims that the variance of the sugar content of its yogurt is less than or equal to 25. A sample of 20 servings is selected, and the sugar content is measured. The variance of the sample is found to be 36. Ata = 0.10 test the claim. Use Traditional method. For One Population: Show your work for finding Test value, Critical value(s), or P-value. For Two Populations: Use your calculator to give the values of...
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