exam 1

# exam 1 - EXAM 1 Review questions Chapter 1 1 Reviewing the...

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EXAM 1 Review questions Chapter 1 1. Reviewing the 2002 Dixie Chicks album Home , Bill Friskics-Warren wrote in The New York Times on August 25 of that year that "[m]ost of the record's 11 tracks will no doubt be deemed too long for airplay, some running as long as six minutes." (A song's length is often considered an important factor in whether or not it is widely played on the radio.) The band's albums— Wide Open Spaces (Wide), Fly , and Home contain a total of 37 songs ranging from 2.4 minutes to 6.0 minutes. The table below shows the album, the song, and song length for a few songs from these three albums. What are the "individuals" of interest in this data set? A. Natalie Maines, Emily Robison, and Martie Maguire. B. Length of songs. C. Songs. Answer: C

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2. Based on the histogram above, how many songs are four minutes or more? Assume that song lengths do not fall on the border of any of the histogram's classes. A. B. C. Answer: C 3. The first five songs on the album Fly have lengths of 3.87, 3.07, 4.85, 5.20, and 4.32 minutes. What is the median length of these songs? A. 4.85 minutes. B. 4.32 minutes. C. 4.262 minutes. Answer: B 4.
Based on the plot above, about one-quarter of which album's songs are longer than five minutes? A. Fly B. Home C. Wide Open Spaces (Wide) Answer: B 5. The untitled plot shown above is a:

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A. Bar graph. B. Normal quantity plot. C. Histogram. Answer: A
6. The plot above suggests: A. A strong linear relationship between z -score and minutes. B. A highly skewed distribution of song lengths. C. An approximately Normal distribution of song lengths. Answer: C 7. If we assume Dixie Chicks song lengths vary Normally with mean 3.9 minutes and standard deviation 0.9 minutes, what is the probability that a song will be shorter than 3 minutes? A. About 0.84. B. About 0.78. C. About 0.16. Answer: C 8. The lengths of the opening songs on these three Dixie Chicks albums are 3.9 minutes, 3.9 minutes, and 4.2 minutes. What is the standard deviation for these three songs?

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A. 0.4463. B. 0.1732 C. 0.03. Answer: B
9. The mean song length of all songs on the these three Dixie Chicks albums is 3.694 minutes and the standard deviation is 0.873 minutes. How many standard deviations from the mean is the song "Travelin' Soldier," which is timed at 5.717 minutes? A. 1.645 standard deviations above the mean. B. 6.549 standard deviations above the mean. C. 2.317 standard deviations above the mean. Answer: C 10. Assuming Dixie Chicks song lengths vary Normally with mean 3.9 minutes and standard deviation 0.9 minutes, give the song length such that just 2.5% of songs are shorter than this. A. 2.136 B. 5.664 minutes. C. 3.8775 minutes. Answer: A Chapter 2 1.

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