Answered: Suppose the amount of time teenagers…

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 26PFA

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Question

36. A researcher is interested in whether teenagers have changed how much they watch TV nowadays. Historically, it was known that teenagers watched 20 hours of TV per week with a standard deviation of 4 hours. Our researcher took a random sample of 50 teenagers and found that on average they watched 15 hours of TV per week with a standard deviation of 6 hours.

Suppose the amount of time teenagers spend watching TV is normally distributed. How should we calculate our test statistic?

Group of answer choices

Z=(15-20)/(6/√50)

Z=(15-20)/(4/√50)

T=(15-20)/(6/√50)

T=(15-20)/(4/√50)

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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