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A random sample of 168 students were asked how many songs were in their digital music library and what fraction of them were legally purchased. Overall, they reported having a total of 117,079 songs, of which 23.1% were legal. The music industry would like a good estimate of the fraction of songs in students digital music libraries that are legal.
a) Think carefully. What is the parameter being estimated? What is the population? What is the sample size?
b) Check the conditions for making a confidence interval.
c) Construct a 95% confidence interval for the fraction of legal digital music.
d) Explain what this interval means. Do you believe that you can be this confident about your result? Why or why not?
a) Construct a double stem-and-leaf diagram for these data. b) Find the sample mean, sample median, and sample standard deviation for these data.
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How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
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An independent testing services road-tested 36 of the automobiles.
Given the above function, use the four-step process to find a slope predictor function m(x). Then write an equation for the line tangent to the curve at the point x = 8.
What is the geometric mean annual increase for the period?
Test whether the mean weight is less than 10 pounds. Use P-value approach.
Find out the mean, median and mode for the given data
In 1990, the population of Austin, Texas, was 494,290. During the next 10 years, the population increased by about 3% each year.
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