An injection moulding machine produces battery connectors for mobile phones.The process "usually" runs with a mean diameter of 3.8mm and a standard deviation = 2.2 mm.The operator suspects that the process has shifted.A sample of 20 was taken.The 95% CI for u, using the one-sample Z, is 2.736mm, 4.664mmWhat action should you take?O Let the machine continue to run.Stop the machine.O Wait and re-do the statistical test, the wrong statistical test was used.

The random variable X follows normal distribution. The sample mean is 3.8 mm. The population…

Answered: An injection moulding machine produces…

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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The amount of trash generated by US households (in lbs per day) is normally distributed. You take a sample of 10 people. The sample average is xbar=10.91 lbs, and the sample standard deviation is s=4.736. What is the 99% Conf. Int. for the mean? Group of answer choices a. 6.04 to 15.78 b. 8.33 to 13.49 c. 8.09 to 13.73 d. 7.74 to 14.08
Find the sample size needed to estimate the percentage of residents of one region of a country who are left-handed. Use a margin of error of one percentage point, and use a confidence level of 95%. Complete parts (a) through (c) below. a. Assume that p and q are unknown. The sample size needed is (Round up to the nearest whole number as needed.) b. Assume that based on prior studies, about 11% of residents of the region are left-handed. The sample size needed is (Round up to the nearest whole number as needed.) ***** c. How do the results from parts (a) and (b) change if the entire country is used instead of the one region of that country? If the entire country is used instead of the one region of that country, the result from part (a) and the result from part (b) Y
Compute the range and sample standard deviation for strength of the concrete (in psi). 3910, 4050, 3200, 3000, 2930, 3840, 4050, & 4060. The range is = Psi S= Psi
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A manufacturer of bolts has a quality-control policy that requires it to destroy any bolts that are more than 4 standard deviations from the mean. The quality control engineer knows that the bolts coming off the assembly line have mean length of 13 cm with a standard deviation of 0.05 cm. For what lengths will a bolt be destroyed? Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) OA. A bolt will be destroyed if the length is less than OB. A bolt will be destroyed if the length is greater than cm. OC. A bolt will be destroyed if the length is between OD. A bolt will be destroyed if the length is less than cm. KOTE cm and cm. cm or greater than cm.
A forest ranger has data on the heights of a large growth of young pine trees. The mean height is 3.2 feet and the standard deviation 0.6 feet. A histogram shows that the distribution of heights is approximately normal. Approximately what proportion of the trees should we expect to be between 4.0 and 4.4 feet tall? A) 0.02 B) 0.07 C) 0.91 D) 0.98
The blood pressure in millimeters was measured for a large sample of people. The average pressure is 140 mm, and the SD of the measurements is 20 mm. The histogram looks reasonably like a normal curv Use the normal curve to estimate the following percentages. Choose the answer that is closest to being correct. A 19.1% B 30.9% C 38.2% D 69.1% E 68.27% A The percentage of people with blood pressure between 130 and 150 mm. B The percentage of people with blood pressure between 140 and 150 mm. D The percentage of people with blood pressure over 150 mm.
State the hypothesis and identify the claim. Find the critical and z-values.
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Use the standard normal table to find the z-score that corresponds to the given percentile. If the area is not in the table, use the entry closest to the area. If the area is halfway between two entries use the z-score halfway between the corresponding z-scores. If convenient, use technology to find the z-score. P 25 Click to view page 1 of the table. Click to view page 2 of the table. The z-score that corresponds to P25 is (Round to two decimal places as needed.)

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