Answered: researcher collected sample data for…

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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Question

A researcher collected sample data for

women ages

. The sample had a mean serum cholesterol level (measured in mg/100 mL) of

192.7

, with a standard deviation of

9.2

. Assuming that serum cholesterol levels for women ages

are normally distributed, find a

90%

confidence interval for the mean serum cholesterol level of all women in this age group. Then find the lower limit and upper limit of the

90%

confidence interval.

Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.

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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