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A smartphone company found in a survey that 17% of people did not own a smartphone, 18% owned a smartphone only, 29% owned a smartphone and only a tablet, 21% owned a smartphone and only a computer, and 15% owned all three. If a person were selected at random, what is the probability that the person would own a smartphone only or a smartphone and computer only?
Eastern Europe is sometimes considered the 'forgotten' part of Europe! For this project, you will become an expert on one Eastern European country.
What is the probability of selecting a sample of n=9 scores with a mean less than M=34? What is the probability of selecting a sample of n=36 scores with a mean less than M=34?
Suppose that the lifetime of a certain type of lamp has an exponential distribution for which the value of the parameter P is unknown.
Continuing Problem 11.4.3, find the optimal filter h = [h0 h1] based on M = 2 samples of Yn. What value of c minimizes the mean square estimation error?
Assume that if the packet is received correctly that we do not send an acknowledgement. What is the average time for a successful transmission?
How large a sample is necessary to estimate the proportion of interest to within 2% in a 95% confidence interval?
Perform a cross-tabulation analysis along with a chi-square test using the raw data. Calculate expected frequencies for each cell
If a random sample of 200 test takers is selected, find the probability that the average score of the sample will be between 500 and 520.
Describe how you might sample books using a probability sampling technique. Now speculate on the ways that the outcomes of your research might diff er using the two techniques.
consider the experiment of drawing two cards from a shuffled deck and then getting them back where success is now
Calculate IRRs for A and B. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.)
Use the applet to calculate the power of the test against the alternative u = 122. Can the test be relied on to detect a mean that differs from 128 by 6?
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