A university wants to determine the population average grade of all students who take astatistics class online. The grade distribution of online statistics classes is normal. Theaverage grade of 20 online statistics classes is 60% with a standard deviation of 15%. Find a95% confidence interval for the average grade of all online statistics classes.(52.98, 67.02)(53.43, 66.57)(59.79, 60.21)O The sample size is too small to compute a confidence interval.

Confidence interval: It is defined as the range which contains the value of true population…

Answered: A university wants to determine 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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A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 162.3-cm and a standard deviation of 0.7-cm. For shipment, 9 steel rods are bundled together.Find P26, which is the average length separating the smallest 26% bundles from the largest 74% bundles.P26 =
A large study of the heights of 550 adult men found that the mean height was 71 inches tall. The standard deviation was 7 inches. If the distribution of data was normal, what is the probability that a randomly selected male from the study was between 50 and 85 inches tall? Use the 68-95-99.7 rule (sometimes called the Empirical rule or the Standard Deviation rule). For example, enter 0.68, NOT 68 or 68%. Answer = (Write your answer in decimal form, not percentage form. For example, if your percentage is 99%, enter 0.99, not 99. Round your answer to three decimal places.) Caution: Using tables or Excel for this may produce a wrong answer. Use the 68-95-99.7 rule.
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sample of 8 students scored the following grades: 20, 40, 35, 30, 57, 57, 46, 42. Find the sample mean, mode and median. OCompute the standard deviation.
A radio station claims that the amount of advertising each hour has a mean of 17 minutes and a standard deviation of 1.7 minutes. You listen to the radio station for 1 hour and observe that the amount of advertising time is 7 minutes. Calculate the z-score for this amount of advertising time.
The mean temperature in Amman for the month of October is 23 degrees with a standard deviation of 4.2 degrees. What is the z- score for a temperature of 29 degrees? O a. -1.43 O b. 1.43 O .0.71 O d. -0.95
A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner selects 35 of these batteries and fınds the mean lifetime to be 1370 hours with a standard deviation of 70 hours. Test the manufacturer's claim. Use a = =0.05. Test Statistic Round to thousandths place. %3D P-Value = Round to thousandths place. Decision: Write 'Reject' or 'Fail to Reject'
According to the U.S. Census, the average adult woman is the United States is 65 inches tall and the standard deviation is 3 inches. If Zsike is 67 inches tall, what is her z-score?
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Five students took a self-confidence test. Their deviation scores were –4, +3, +1, –2, and +2. Assuming that these scores com form a normaldistribution, which deviation represents the highest raw score?
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The tallest living man at one time had a height of 243 cm. The shortest living man at that time had a height of 127.5 cm. heights of men at that time had a mean of 170.52 cm and a standard deviation of 6.62. Which of these two men had the height that was more extreme? Use z scores

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