A manufacturing firm claims that the batteries used in their electronic games will last an average of 28 hours. To maintain this average, 16 batteries are tested eachmonth. If the computed t-value falls between - to 01 and to 01, the firm is satisfied with its claim. What conclusion should the firm draw from a sample that has a meanof x = 25.5 hours and a standard deviation of s = 5 hours? Assume the distribution of battery lives to be approximately normal.Click here to view page 1 of the table of critical values of the t-distribution.Click here to view page 2 of the table of critical values of the t-distribution......Since the computed t-value t=does not fall between - to.01and to.01%3Dthe firm shouldbesatisfied with the claim.(Round to three decimal places as needed.)

Answered: Image /qna-images/answer/bd9f59f5-06b1-4f11-8ae8-8a2e3db378d9.jpg

Answered: A manufacturing firm claims that the…

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 life of a certain model of phone is normally distributed with an average of 30 months and a standard deviation of 6 months. In a sample of 65 phones, what is the approximate number that last between 28 months and 34 months?
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.
Suppose that the heights of adult women in the United States are normally distributed with a mean of 65 inches and a standard deviation of 2.5 inches. Jennifer is taller than 70% of the population of U.S. women. How tall (in inches) is Jennifer? Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place.
A researcher is interested in estimating the mean time it takes adults to learn a certain task. He wants to be 99% confident that the mean time for a sample of adults is within 0.6 minutes of μ. In a small pilot study, the standard deviation of learning times was 6.9 minutes. How large a sample of adults should be tested?
Suppose that the hemoglobin levels among healthy females are normally distributed with a mean of 14.1 gdL. Research shows that exactly 95% of healthy females have a hemogoblin level of 16.1 gdL. What is the standard deviation of the distribution of hemoglobin levels and healthy females. Carry you intermediate computations to atleast four decimal places, and round your answer to at least two decimal places.
In a random sample of 6 cell phones, the mean full retail price was $502.30 and the standard deviation was $183.00. Further research suggests that the population mean is $434.59. Does the t-value for the original sample fall between to 95 and to 95? ASsume that the population of full retail prices for cell phones is normally Sol distributed. fall between -to.95 and to.95 because to.95 . The t-value of t (Round to two decimal places as needed.) Question tions left this cy enews on 11/24/ ter Q All Q Pend Answ ORejec Subjects ? Math Enter your answer in each of the answer boxes. wXP tv NOV 209國目 11 MacBook Pro DD DII F11 F10 F9 F8 F7 000 F6 F5 F4 F3 F2 F1
In a random sample of 8 cell phones, the mean full retail price was $549.30 and the standard deviation was $182.00. Further research suggests that the population mean is $425.14. Does the t-value for the original sample fall between - to 95 and to 95? Assume that the population of full retail prices for cell phones is normally distributed. The t-value of t = fall between - to 95 and to 95 because to 95 (Round to two decima d.) does not does
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An expensive watch is powered by a 3-volt lithium battery expected to last 5 years. Suppose the life of the battery has a standard deviation of .6 year and is normally distributed Compute the length-of-life value for which 10% of the watch's batteries last longer .
The level of calcium in the blood of healthy young adults follows a normal distribution with mean u = 10 milligrams per deciliter and standard deviation s = 0.4. A clinic measures the blood calcium of 100 healthy pregnant young women at their first visit for prenatal care. The sample mean of these 100 measurements is X = 9.8. Is this evidence that the mean calcium level in the population from which these women come is less than 10? To answer this question, we perform the following hypothesis test: H0: u = 10, Ha: u < 10. What is the test statistic? (use two decimal places in your answer) What is the p-value equal to? At the 10% significance level, do you accept or reject the null hypothesis? Answer ACCEPT or REJECT t the 5% significance level, do you accept or reject the null hypothesis? Answer ACCEPT or REJECT
Suppose the police have set up automatic speed surveillance on a street in an area. During one week they get 987 measurements. The average in the data set is 50,7 kh/h, with a standard deviation of 3,2 km/h. Calculate the z-value for an observation with the value 53,8 km/h.
Suppose that the TSH (Thyroid Stimulating Hormone) levels among healthy individuals are normally distributed with a mean of 3.2 units/mL. Suppose also that exactly 98% of healthy individuals have TSH levels below 6.1units/mL. Find the standard deviation of the distribution of TSH levels of healthy individuals. Carry your intermediate computations to at least four decimal places. Round your answer to at least two decimal places.

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