Find the standard deviation, s, of sample data summarized in the frequency distribution table below by using theformula below, where x represents the class midpoint, f represents the class frequency, and n represents the totalnumber of sample values. Also, compare the computed standard deviation to the standard deviation obtained from theoriginal list of data values, 11.1.S=n[Σ (f.x²) ] - [Σ(f•x)]²n(n-1)IntervalFrequency20-26227-33234-401....Standard deviation = (Round to one decimal place as needed.)41-47448-541755-613162-6839

ClassFrequency20 - 26227 - 33234 - 40141 - 47448 - 541755 - 613162 - 6839

Answered: Find the standard deviation, s, of…

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 butterfly is normally distributed with a mean of 50 days. You took a random sample of 25 such butterflies. The mean life for this sample is 47 days a standard deviation of 3 days. At α = 0.05. a. Test to see if the average life of a butterfly is different from 50 days. b. Your friend believes that the life of a butterfly is less than 50 days. Is she correct?
The following table shows the number of people that have either 0, 1, 2 or 3 cars registered in their name, from a sample of 311 people. x n 0 93 1 91 2 60 3 67 (a) Find the mean number of cars owned for this sample. Give your answer to at least 2 decimal places. (b) Find the standard deviation of cars owned for this sample. Give your answer to at least 2 decimal places.
Use the formula to find the standard error of the distribution of differences in sample means, ₁ - ₂. Samples of size 35 from Population 1 with mean 3.1 and standard deviation 1.8 and samples of size 35 from Population 2 with mean 2.0 and standard deviation 1.4 Round your answer for the standard error to two decimal places. standard error = i
Use the formula to find the standard error of the distribution of differences in sample means, ₁ - ₂. Samples of size 23 from Population 1 with mean 6.5 and standard deviation 3.4 and samples of size 40 from Population 2 with mean 7.9 and standard deviation 6.6 Round your answer for the standard error to two decimal places. standard error = PI
A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1511 and the standard deviation was 312. The test scores of four students selected at random are 1910, 1280, 2240, and 1420. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The z-score for 1910 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 2240 is (Round to two decimal places as needed.) The Z-score for 1420 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 OA. The unusual value(s) is/are (Use a comma to separate answers as needed.) OB. None of the values are unusual.
An analyst for a transportation metro is asked to examine the time required (x) in minutes for a specific commute route. She records 200 randomly sampled times and finds: Σx = 11,000 and Sxx =1791. Find the average commute time, as well as standard deviation and coefficient of variation.
Q1.2 Standard Deviation of Sampling Distribution of x-bar Suppose the distribution of cholesterol levels in a population of men is approximately normally distributed with a mean of 200 mg/dL and a standard deviation of 32 mg/dL. What is the standard deviation of the sampling distribution of for n=25? Write your answer as a decimal value rounded to four decimal places. (Don't put any text or supporting work! Just the numeric value.)
For any variable X, if: the standard deviation = and the variance = Var(X) Which of the following statement is true: Select one: a. SD < Var(X) O b. (SD)² = Var(X) (SD) C. SD = [var(x)]²
please help me solve this practice question using excel

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