Question 1MO21. The brightness of a television picture tube can be evaluated by measuring the amount of current required to achieve aparticular brightness level. The following data (required current) were collected from a sample: 343.8, 369.3, 380.6, 339, 369.7.Compute a 90% confidence interval on the brightness of the television tubes that has 90% of the values. Input the value the upperlimit of the Tolerance Interval in the blank provided up to 2 decimal places. Provide all the necessary solutions in the submission forboth upper and lower limit.Upper limit of the interval is Blank 1Blank 1Add your answer

Answered: Image /qna-images/answer/2396763d-5dcd-4bc3-bd8a-5b881399f600.jpg

Answered: MO21. The brightness of a television…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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question 3: A simple random sample of 10 items resulted in a sample mean of 30 . The population standard deviation is 10 . a. Compute the 95 % confidence interval for the population mean. Round your answers to one decimal place.( , ) , ( , ) b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95 % confidence interval for the population mean. Round your answers to two decimal places. ( , ) , ( ,) question 6 Wall Street Journal reported on several studies that show massage therapy has a variety of health benefits and it is not too expensive. A sample of 11 typical one-hour massage therapy sessions showed an average charge of 58 . The population standard deviation for a one-hour session is $5.35 b. Using 95% confidence, what is the margin of error (to 2 decimals)? c. Using 99% confidence, what is the margin of error (to 2 decimals)
QUESTION 1 A researcher hypothesizes that children will choose to eat cereals in colorful boxes over those in plain boxes. To test this hypothesis, the researcher records the number of bites that 24 children take of a food given to them from colorful boxes versus plain boxes. If the mean difference (colorful boxes – plain packaging) is MD = 13 and SMD = 1.64, then (a) calculate the 95% confidence interval for these related samples and (b) can we conclude that cereals packaged in colorful boxes significantly changes the number of bites that children took compared to plain packaging? Summarize your conclusion in a sentence.
Question 5: The highway department wants to estimate the proportion of vehicles on the interstate 605 between the hours of midnight and 5 AM that are 18 - wheel trailers. The estimate will be used to determine highway repair and construction considerations. Suppose researchers for the highway department counted vehicles at different locations on the interstate for several nights during this time period. Of the 3481 vehicles counted, 1027 were 18 - wheelers. construct a 95% confidence interval for the proportion of vehicles traveling the interstate 605 during this time period that are 18 - wheelers.
QUESTION 3 The GPAs of nursing students (p1) were compared to GPAs of student-athletes (p2) were compared. Of a sample of 400 randomly and independently selected nursing students, 75% were placed on honor roll. Of a sample of 100 athletes, 80% of the students were placed on honor roll. Calculated the UPPER bound of the 95% confidence interval for the two samples. Round to the nearest hundredth.
QUESTION 4 Copy of The GPAs of nursing students (p1) were compared to GPAs of student-athletes (p2) were compared. Of a sample of 400 randomly and independently selected nursing students, 75% were placed on honor roll. Of a sample of 100 athletes, 80% of the students were placed on honor roll. Calculated the UPPER bound of the 95% confidence interval for the two samples. Round to the nearest hundredth.
Question 1 - USE EXCEL OUTPUT a. Whatare the null and alternative hypotheses? b. At a 90% confidence level, what is the value of alpha (ª), c. What is the critical value (CV comes from the Excel outputbelow) d. What is the value of the test statistic (from the Excel outputbelow) e. What is the p-value associated with the sample statistic?(from the Excel outputbelow) f. Compare PV to alpha (include values in comparison) and TS to CV (include values from output in your comparison) g. What is your Decision? (reject/fail to reject Ho)h.What is your conclusion (in everyday terms)
Question 1 In a random sample of forty-eight 200-metre swims has a mean time of 3.12 minutes and a standard deviation of 0.09 minutes. (a) Construct the 89% confidence interval for the population mean time. (b) If all the other quantities remain the same, how does the indicated change affect the width of the confidence interval? (i) Increase in the sample size (ii) Increase in the level of confidence.
question 17 A smart phone manufacturer is interested in constructing a 95% confidence interval for the proportion of smart phones that break before the warranty expires. 81 of the 1662 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible. a. With 95% confidence the proportion of all smart phones that break before the warranty expires is between____ and _____. b. If many groups of 1662 randomly selected smart phones are selected, then a different confidence interval would be produced for each group. About _____ percent of these confidence intervals will contain the true population proportion of all smart phones that break before the warranty expires and about ____ percent will not contain the true population proportion. please solve blank
Question 4: A survey was administrated to determine the proportion of workers who reject relocation offers to be an administrator for family considerations. In the survey 423 people out of 672 rejected relocation offers due to family considerations. Use this information to construct a 95% confidence interval for the proportion of the population that will reject relocation offers due to family considerations.
QUESTION 1 Suppose a sample of 200 local vendors is selected as part of a survey conducted by the Ministry of Trade and it is found that 145 of the local vendors make an average income in excess of $ 7 600 per month. a) What is the point estimate of the proportion of local vendors who make an average income less than N$ 7 600 per month? b) What is the 98% confidence interval estimate of the population proportion of local vendors who make an average income in excess of $ 7 600 per month? c) Interpret the answer in (b).
Question 13: For a confidence level of 80% with a sample size of 32, find the critical t value.
QUESTION 1 Suppose a sample of 200 local vendors is selected as part of a survey conducted by the Ministry of Trade and it is found that 145 of the local vendors make an average income in excess of $ 7 600 per month. a) Suppose that a 97% confidence interval estimate of the proportion of local vendors who make an average income less than N$ 7 600 per month is required. How large a sample should be taken if the desired margin of error is 5%? b) Suppose it has been established from past studies that 75% of local vendors make an average income in excess of N$ 7 600 per month. Use the p-value approach and conduct a hypothesis test at a 1% level of significance to determine whether the proportion of local vendors who make an average income in excess of N$ 7 600 per month differs from the historical level?

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