18. A simple random sample of 20 paperback novels indicates that they are, on average, 425.1 pages long. Asume that the page count for all paperback novels is Normally distributed, with a standard deviation of 92.8 pages. Calculate a 90% confidence interval for the mean. Group of answer choices 384 to 467 272 to 578 417 to 433 391 to 459

18. A simple random sample of 20 paperback novels indicates that they are, on average, 425.1 pages long. Asume that the page count for all paperback novels is Normally distributed, with a standard deviation of 92.8 pages. Calculate a 90% confidence interval for the mean. Group of answer choices 384 to 467 272 to 578 417 to 433 391 to 459

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

18.

A simple random sample of 20 paperback novels indicates that they are, on average, 425.1 pages long. Asume that the page count for all paperback novels is Normally distributed, with a standard deviation of 92.8 pages. Calculate a 90% confidence interval for the mean.

Group of answer choices

384 to 467

272 to 578

417 to 433

391 to 459

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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