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A survey of Internet users reported that 20% downloaded music onto their computers. The filing of lawsuits by the recording industry may be a reason why this percent has decreased from the estimate of 27% from a survey taken two years before. Assume that the sample sizes are both 1451. Using a significance test, evaluate whether or not there has been a change in the percent of Internet users who download music. Provide all details for the test. (Round your value for zto two decimal places. Round your P-value to four decimal places.)
Z=
p-value=
Summarize the conclusion
Also report a 95% confidence interval for the difference in proportions. (Round your answers to four decimal places.) (_____,_____)
Explain what information is provided in the interval that is not in the significance test results.
Genetics of peas. According to genetic theory, the blossom colour in the second generation of the certain cross of sweet peas should be red or white in a 3:1 ratio. That is, each plant has probability 3/4 of having red blossoms, and the blossom co..
A random sample of 81 credit sales in a department store showed an average sale of $68.00. Historically, it is known that the standard deviation of the population is $27.00.
use your calculator or other software to conduct a test of the hypothesis that mu6 vs mult6 for the following data.
The usable lifetime of a particular electronic component is known to follow an exponential distribution with a mean of 6.2 years. Let X = the usable lifetime
the comfort widget company makes several different sized widgets. the smallest widget the company manufactures has a
The average public elementary school has 450 students. assume the stand deviation of the distribution is 99. if a random sample of 36 public elementary schools is selected, find the probability that the number of students enrolled is between 445 a..
Outside a? home, there is a 10?-key keypad with letters A, B, C, D, E, F, G, H, I, and J that can be used to open the garage if the correct ten?-letter code.
How many different possibilities exist for the set of iced-tea drinks that a given participant will taste? (Show how you calculated your answer.)
A manufacturer examines its records over the last year on a component part received from outside suppliers. The breakdown on source (supplier A, supplier B).
Carry out a complete analysis, indicating exactly what is significant and why, as well as a discussion about whether the assumptions are being met.
Calculate the probability that fewer than 320 out of the n=750 adults over 65 in the study suffer from one or more of the conditions under consideration.
consider the question what is the probability of getting a 6-card poker hand that contains a card from all four suits
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