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MP-3 players, and most notably the Apple iPod, have become an industry standard for people who want to have access to their favorite music and videos in a portable format. The iPod can store massive numbers of songs and videos with its 120-GB hard drive.
Although owners of the iPod have the potential to store lots of data, a recent study showed that the actual disk storage being used is normally distributed with a mean equal to 1.95 GB and a standard deviation of 0.48 GB. Suppose a competitor to Apple is thinking of entering the market with a low-cost iPod clone that has only 1.0 GB of storage. The marketing slogan will be "Why Pay for Storage Capacity that You Don't Need?" Based on the data from the study of iPod owners, what percentage of owners, based on their current usage, would have enough capacity with the new 1-GB player?
The relative frequency distribution of the number of TVs sold in a day in a department store in the last year is as follows: Compute the mean and standard deviation of this distribution.
post an analysis of how hypothesis testing and the use of confidence intervals are the same. then analyze how these are
In a survey of the 3000 boy scouts in the National Capital Area Council (NCAC), it is found that they have a mean weight of 135 lbs with a standard deviation of 15 lbs. How many of the boy scouts have weights between 120 lbs and 150 lbs.?
Based only on this information, estimate the probability that you could ski at this resort after May 25 next year. What is the average closing day based on history?
Discuss how a t test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students.
Compute the mean and variance of the discrete probability distribution and determine the probabilities of the following events using the binomial formula.
No information is available about its value. How large a sample size is needed to estimate it to within 0.15 with 99% confidence?
Study have in distinguishing between case-fatality rates in 1990 and 2000-2005 if a two-sided test with significance level .05 is planned? B. How large a sample is needed in the previous problem to achieve 90% power?
the weights of envelopes sent from an insurance office are normally distributed with mean 12 ounces and standard
player 1 and player 2 play a game where each round player 1 has a 60 chance of winning and player 2 has a 40 chance of
If random samples, each with n = 9 scores, are selected from a normal population with µ = 80 and σ = 36, then what is the expected value for the distribution of sample means?
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
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