The mean and standard deviation of the quality grade-points of a random sample of 36 students from a large population are2.6 and 0.3 respectively. The 95% confidence interval for the mean of the entire population (rounded off to two decimal) is:O A. [2.52; 2.68]O B. [2.58; 2.61]O C. [2.50; 2.70]O D. [2.50; 2.69]

Given n=36 xbar=2.6 Standard deviation (Sigma) =0.3

Answered: The mean and standard deviation of 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 standardized exam's scores are normally distributed. In a recent year, the mean test score was 1538 and the standard deviation was 314. The test scores of four students selected at random are 1970, 1280, 2260, and 1430. Find the z-scores that correspond to each value and determine whether any of the values are unusual. .... The z-score for 1970 is (Round to two decimal places as needed.) The z-score for 1280 is (Round to two decimal places as needed.) The z-score for 2260 is (Round to two decimal places as needed.) The z-score for 1430 is. (Round to two decimal places as needed.) Which values, if any, are unusual? Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The unusual value(s) is/are (Use a comma to separate answers as needed.) O B. None of the values are unusual.
J11.
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
Assume that you have been provided the following information for a sample of cars The covariance between weight and miles per gallon is equal to -4.9 pound-miles. The standard deviation of the cars' mileages is 7.75. The standard deviation of the cars' weights is 0.94. Estimate the correlation coefficient to the first decimal place.
In a Normal distribution, the Empirical Rule states that... ["", "", "", "", ""] of the data is within 1 standard deviation of the mean, ["", "", "", "", ""] of the data is within 2 standard deviation of the mean, and ["", "", "", "", ""] of the data is within 3 standard deviation of the mean.
You are given that X is normally distributed witha mean of 50.2 and a standard deviation of 3.7 a) What proportion of the population lies between 47 and 52 b) What is the value of the 95 percentile? c) What is the z score for the data value of 43.7
TF.15 The standard deviation of a random sample of the hourly wages of 18 post office employees is s = $3.38. Assuming normal distribution, find a 95% confidence interval for the standard deviation σ. Use X2 - distribution.
In the distribution with u = 35 and o = 6, a score of X = 50 correspond to z =
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The teacher in a kindergarten school measures the height of her students. If the heights were normally distributed with the mean of 112 cm and a standard deviation 3.25 cm, find the heights x that corresponds to the following z-scores: z = 2.24 z = -1.52 z = 0.76
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