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Use of Twitter. Find the probabilities for parts (a), (b), and (c) of the previous exercise.
Exercise Use of Twitter. Suppose that the population proportion of Internet users who say that they use Twitter or another service to post updates about themselves or to see updates about others is 19%. Think about selecting random samples from a population in which 19% are Twitter users
(a) Describe the sample space for selecting a single person.
(b) If you select three people, describe the sample space.
(c) Using the results of (b), define the sample space for the random variable that expresses the number of Twitter users in the sample of size 3.
(d) What information is contained in the sample space for part (b) that is not contained in the sample space for part (c)? Do you think this information is important? Explain your answer.
Suppose that 1 out of 500 infant's are born with Down's Syndrome.
consider the following. give your answers correct to two decimal places.a find the standard score z such that the area
How could the number of people who do not know who Martha Stewart is increase from June to July? Did people forget her? Or is the poll perhaps flawed? Explain how these results could be valid.
What was the explanatory variable? The explanatory variable is the number of students taking a first year seminar course for pre-health professional majors.
for the following distributionp px0 .0271 .1892 .4413 .343what is the mean of the
question given the equation y 2x 4 answer the following questionsa. what type of equation is this?b. what is the
two airplanes are flying in the same direction in adjacent parallel corridors. at time t 0 the first airplane is 10 km
Is this a one- or two-tailed test and conduct all 6 steps of the appropriate statistic. Be sure to label all six steps.
a professor is interested in the number of students who use the campus library for academic purposes. she takes a
a researcher would like to evaluate the claim that large doses of vitamin c can help prevent the common cold. one group
X is 10-dimensional Gaussian (0,I) random vector. Since X is zero mean, RX = CX = I. We will use the method of Problem 7.3.7 and estimate RX using the sample correlation matrix
given the following information alternative hypothesis p lt 0.70 n 300 x 205 alpha 0.02. state your decision and
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