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Telephone interviews were conducted on a representative sample of 1,003 adults living in the United States. For this sample, 506 adults admitted that they have paid to download music. a. Use the survey information to find a point estimate for the true proportion of U.S. adults who have paid to download music. b. Find an interval estimate for the proportion, part a. Use a 90% confidence interval. c. Give a practical interpretation of the interval, part b. Your answer should begin with "We are 90% confident...." d. Explain the meaning of the phrase "90% confident."
Imagine there are exactly m opportunities to cross safely by the time the nth shock occurs. What is the probability that the mth opportunity is a close call (that it occurs immediately before the nth shock).
A store has an average of 25 people arriving each minute to checkout and each person on the average require 4 minutes to be processed at the checkout. What is the minimum number of cashiers required?
At the .10 significance level, can we conclude that there is a difference in the length of time the two types of treatment lasted?
One of the three vice-presidents has not been invitged to attend any of the last four games. what is the probability that this could happen?
Find the values of the correlation coefficient and the coefficient of determination. Find the slope, y-intercept, and equation of the regression line for the data. Plot the points and a graph of the regression line on the same axes.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
The guard agrees, and comes back later and tells A that he gave the pardon message to B. What are A's chances of being executed, given this information?
Trying to use mathematical models to design effective hypothesis testing during experiments. In hypothesis analysis the null hypothesis and significance level of the test must be set prior to data collection.
Construct a 99% confidence interval (Konfidenz interval) for the difference in proportions of all adults and all teenagers who watched the program and liked it.
As an aid for improving students' study habit, nine students were randomly selected to attend a seminar on the importance of education in life. The table shows the number of hours each student studied per week before and after the seminar.
An entrepreneur owns two hotels, one in the western region of a certain state and the other in the eastern region. He thinks that the average amount spent by guests for lunch at his Friendly Café-West is less than $34.50
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
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