A statistics practitioner selected a random sample of 75 observations from a populationwith a known standard deviation equal to 15 and computed a sample mean equal to 90.a) Estimate the population mean with 95% confidence.b) Repeat Part a) using a 98% level of confidence.c) Repeat Part a) using a population standard deviation equal to 20.d) Repeat Part a) using a sample size equal to 400. Any changes to C.I.?

Answered: Image /qna-images/answer/b37aa676-8f55-4464-a080-028b144dcd56.jpg

Answered: A statistics practitioner selected a…

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 annual Commissions Per Sales Person a manufacturer of light employed by Machinery averaged $40000. A Standard deviation of $5000. The percent between $32000 and $42.000 equal to A) 60.0% B) 39.94% c) 34.13 %. 0) 81.66%
For a population with a mean equal to 200 and a standard deviation equal to 30, calculate the standard error of the mean for the following sample sizes. a) 20 b) 40 c) 60 a) The standard error of the mean for a sample size of 20 is (Round to two decimal places as needed.) b) The standard error of the mean for a sample size of 40 is (Round to two decimal places as needed.) c) The standard error of the mean for a sample size of 60 is
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A. Find the first quartile B. Find the 2nd quartile C. Find the 3rd quartile
The IQ of a person follows a normal distribution and has a mean of 100 and a standard deviation of 15. What percentage of the people have IQ scores between 70 and 130? A) 95% B) 50% C) 2.5% D) 68%
The distribution of weights for 12-month-old baby boys in the US is approximately normal with mean u = 22.5 pounds and standard deviation o = 2.2 pounds. a) If a 12-month-old boy weighs 20.3 pounds, approximately what weight percentile is he in? b) If a 12-month-old boy is in the 84th percentile in weight, estimate his weight. c) Estimate the weight of a 12-month-old boy who is in the 25th percentile by weight. d) Estimate the weight of a 12-month-old boy who is in the 75th percentile by weight.
Based on data from the 2010 Census the average age of a Pierce County, Washington resident is 41 years with a standard deviation of 12.3 . The data is normally distributed. The median age, in years, is: a) 41 b) 38 c) 43 d) 33
Part 4. 1. Examine the data set below that represents a sample. A.) the average of the sample; B.) the median of the enéchantion; C.) the mode of the sample; D. ) the minimum and maximum values; J.) the extent; F.) the first, second and third quartiles; G.) the interquartile interval; H.) the standard deviation of the sample; I.) The variance of the sample.
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