Behavioral Sciences STAT (with CourseMate Printed Access Card) (New, Engaging Titles from 4LTR Press)

2nd Edition

ISBN: 9781285458144

Author: Gary Heiman

Publisher: Cengage Learning

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calcul…

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Textbook Question

Chapter 4, Problem 15SP

Tiffany has a normal distribution of scores ranging from 2 to 9.

(a) She computed the variance to be 2.06. What should you conclude about this answer and why?

(b) She recomputes the standard deviation to be 18. What should you conclude and why?

(c) If she computed that SX 0, what would this indicate?

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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Chapter 4, Problem 14SP

Chapter 4, Problem 16SP

Chapter 4 Solutions

Behavioral Sciences STAT (with CourseMate Printed Access Card) (New, Engaging Titles from 4LTR Press)

Ch. 4 - What does a larger measure of variability...Ch. 4 - In any research, why is describing the variability...Ch. 4 - Thinking back on the previous three chapters, what...Ch. 4 - Prob. 4SP Ch. 4 - (a) What is the range? (b) Why is it not the most...Ch. 4 - Prob. 6SP Ch. 4 - Prob. 7SP Ch. 4 - Why is the mean a less accurate description of the...Ch. 4 - Prob. 9SP Ch. 4 - (a) What do S2 X, s2 X, and s2 X have in common?...

Ch. 4 - (a) How do we determine the scores that mark the...Ch. 4 - Why are your estimates of the population variance...Ch. 4 - In a condition of an experiment, a researcher...Ch. 4 - If you could test the entire population in...Ch. 4 - Tiffany has a normal distribution of scores...Ch. 4 - From his statistics grades, Demetrius has a X 60...Ch. 4 - Prob. 17SP Ch. 4 - Say that you conducted the experiment in...Ch. 4 - In two studies, the mean is 40 but in Study A,...Ch. 4 - Consider these normally distributed ratio scores...Ch. 4 - Prob. 21SP Ch. 4 - (a) What are the symbols for the true population...Ch. 4 - For each of the following, indicate the conditions...Ch. 4 - Prob. 24SP

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Solution Summary: The author explains that Tiffany has a normal distribution of scores ranging from 2 to 9. The compiled variance is wrong because the sum of squared deviations from the number divided by equations cannot be negative.

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Chapter 4 Solutions