Answered: Data is collected from a random sample…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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Experiment 1:

Data is collected from a random sample of 16 third grade children reading without and then with a dog, to see if reading to a dog improves the average reading speed (ie. reading with dog had more wpm). It can be assumed that the reading speeds of the third graders are normally distributed.

Let = WPM without dog and = WPM with dog.

What is the null and alternative hypothesis? Is the sample independent or dependent?

H₀:

Ha:

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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