6. It was reported that a certain population had a mean of 27. To test this claim, youselected a random sample of size 100. The computed sample mean and standarddeviation were 25 and 7, respectively. The P value for the appropriate set ofhypotheses isa. 0.0021b. 0.9979c. 0.0042d. - 0.4979

The claim is the population had a mean of 27. The sample size n=100 The sample mean x=25 The…

Answered: 6. It was reported that a certain…

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 ages of students in a certain high school had mean 16.5 and standard deviation 1.2. A student whose age is 18 is selected, the z-score of the age 18 is equal to Select one: а. 1.25 O b. -1.5 C. 1.5 d. -1.25
we want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately 38.7. We would like to be 99% confident that the estimate is within 4 of the true population mean. How large of a sample size is required ?
1. A random of 22 fifth grade pupils have a grade point average of 5.02 in Math and a standard deviation of 0.452. Marks ranges fro 1 ( worst) to 6 (excellent). The grade point average (GPA) of all fifth grade pupils of the the last 5 yeras is 4.72. Is the grade point average of the 22 pupils different from the population grade point average?
A population is known to be normally distributed with standard deviation known to be 6.3. In order to test the hypothesis that the true value of the mean is 19 researchers collect a sample of size 36 and calculate the sample mean to be 16. State the distribution of the sample mean and then test this hypothesis using the appropriate test.
Continuing from the last question, with the same values) A researcher is interested in testing whether college students send more or fewer texts per day, relative to the general population. The researcher finds out that the population average of texts sent per day is µ = 112, but is unable to find out the population standard deviation. This researcher then recruits 25 college students, and asks about their texting. They report a sample mean of M = 120, with a SS= 1200 In the last question, you computed the estimated standard error (sM) For this question, compute the value of the t-test. t = ? AND WRITE THAT NUMBER DOWN. YOU WILL NEED IT FOR THE NEXT QUESTION
Use z scores to compare the given values. The tallest living man at one time had a height of 238 cm. The shortest living man at that time had a height of 142.4 cm. Heights of men at that time had a mean of 175.45 cm and a standard deviation of 5.59 cm. Which of these two men had the height that was more extreme? ... Since the z score for the tallest man is z = 0 and the z score for the shortest man is z = the man had the height that was Im- more extreme. (Round to two decimal places.) shortest tallest
4.1
n a school district, all sixth grade students take the same standardized test. The superintendant of the school district takes a random sample of 21 scores from all of the students who took the test. She sees that the mean score is 128 with a standard deviation of 41.4416. The superintendant wants to know if the standard deviation has changed this year. Previously, the population standard deviation was 25. Is there evidence that the standard deviation of test scores has increased at the α=0.005 level? Assume the population is normally distributed. Step 1 of 5 : State the null and alternative hypotheses. Round to four decimal places when necessary.
A population has a mean µ = 70 and a standard deviation o = 28. Find the mean and standard deviation of a sampling distribution of sample means with sample size n = 261. P = (Simplify your answer.) = (Type an integer or decimal rounded to three decimal places as needed.)
3.The average GPA scored by a class is 4.76, and the standard deviation is 0.64. For a sample of 16 students, find the z-score that the average is above 5.0. A.0.375 B.1.5 C.0.75 D.6
A population has a mean u= 81 and a standard deviation o = 21. Find the mean and standard deviation of a sampling distribution of sample means with sample size n = 255. (Simplify your answer.) (Type an integer or decimal rounded to three decimal places as needed.)
We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately �=76.4. We would like to be 95% confident that the estimate is within 0.5 of the true population mean. How large of a sample size is required?�=

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6. It was reported that a certain population had a mean of 27. To test this claim, you selected a random sample of size 100. The computed sample mean and standard deviation were 25 and 7, respectively. The P value for the appropriate set of hypotheses is a. 0.0021 b. 0.9979 c. 0.0042 d. - 0.4979