7.) A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 30 students , the mean age is found to be 22.9 years. From past studies, the standard deviation is known to be 1.5 years , and the population is normally distributed. Construct a Find the 90 % confidence interval of the population mean age .

7.) A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 30 students , the mean age is found to be 22.9 years. From past studies, the standard deviation is known to be 1.5 years , and the population is normally distributed. Construct a Find the 90 % confidence interval of the population mean age .

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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Question

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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