3. A consumer electronics company is comparing the brightness of two different types ofpicture tubes for use in its television sets. Tube type A has mean brightness of 100 andstandard deviation of 16, and tube type B has unknown mean brightness, but thestandard deviation is assumed to be identical to that for type A. A random sample ofn = 25 tubes of each type is selected, and X-X is computed. If equals orHBexceeds, the manufacturer would like to adopt type B for use. The observeddifference is -₁ =3.0. What is the probability thatby 3.0 or moreif HB and HA are equal?exceeds

Answered: picture tubes for use in its television…

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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Similar questions

The scores on a test are normally distributed with a mean of 150 and a standard deviation of 30. Find the score that is 2 1/2 standard deviations above the mean.
When engaging in weight-control (fitness/fat burning) types of exercise, a person is expected to attain approximately 60% of his or her maximum heart rate. For 20-year-olds, this rate is approximately 120 bpm. A simple random sample of one hundred 20-year-olds was taken, and the sample mean was found to be 107 bpm, with a standard deviation of 45 bpm. Researchers wonder if this is evidence to conclude that the expected level is actually lower than 120 bpm. To determine this, we test the following hypotheses: Ho: H= 120 versus H₂ μ< 120 Suppose the mean and standard deviation obtained were based on a sample of size 25 rather than 100.
A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1030 h with a standard deviation of 83 h.Find the z-scores for lightbulbs which last 840 and 890 h. (Round your answers to two decimal places.) The z-score for 840 h is -2.29; the z-score for 890 h is -1.69.Using the answers from Step 1, what percent of these light bulbs will last between 840 and 890 h? (Round your answer to one decimal place.)
On an exam with u=52, a person has a score of x=14, which value for the standard deviation would give this person the highest position in the class distribution?
Mason earned a score of 226 on Exam A that had a mean of 250 and a standard deviation of 40. He is about to take Exam B that has a mean of 550 and a standard deviation of 25. How well must Mason score on Exam B in order to do equivalently well as he did on Exam A? Assume that scores on each exam are normally distributed.
In a survey of 1184 people, 811 people said they voted in a recent presidential election. Voting records show that 66% of eligible voters actually did vote. Given that 66% of eligible voters actually did vote, (a) find the probability that among 1184 randomly selected voters, at least 811 actually did vote. (b) What do the results from part (a) suggest?
Do question 1
Two chemical companies can supply a raw material. The concentration of a particular element in this material is important. The mean concentration for both suppliers is the same, but you suspect that the variability in concentration may differ for the two companies. The standard deviation of concentration in a random sample of n₁ = 10 batches produced by company 1 is s₁ = 4.7 grams per liter, and for company 2, a random sample of n₂ = 16 batches yield s₂ = 5.8 grams per liter. Is there sufficient evidence to conclude that the two populations variances differ? Use a = 0.05. a. Because 0.321 < 0.657 <3.77, fail to reject the null hypothesis b. Because 0.265 < 0.657 <3.12, fail to reject the null hypothesis c. Because 0.386 < 0.657 <3.01, fail to reject the null hypothesis d. None among the choices
a data set has a mean of 210 and a standard deviation of 40, what is the z- Score for a ralue of140 If
75 specimens of the new chip were tested and 67 specimens of the old chip were tested. The average speed, in MHz, for the new chips was 494.9 and the standard deviation was 19.3. The average speed of the old chips was 485.8 and the standard deviation was 16.7. Suppose we wish to test Ho : Hx - Hy = 0 versus H1 : Hx - Hy # 0. Calculate the z-score. (answers are considered correct if they're within 5% of the correct value)

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