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U.S. News and World Report (December 19, 1994, pp. 62-71) reported on a survey of 1000 American adults, conducted by telephone December 2-4, 1994, designed to measure beliefs about apocalyptic predictions. One of the results reported was that 59% of the sample said that they believe the world will come to an end.
a. Calculate the standard error of the sample proportion who believe that the world will come to an end.
b. Calculate a 95% confidence interval for the population proportion. Interpret the interval in a way that could be understood by a statistically naïve reader.
During a 36 year period, lightening killed 2768 people in the US. Assume that this rate holds true today and is constant throughout the year. Find the probability that tomorrow.
Which of the following would be an appropriate alternative hypothesis?
In an ABCNews.com nationwide poll done in 2001, the proportion of respondents who thought that it should be illegal to use a hand held cell phone while driving a car was 69 %. The poll's sample was 1027.
How many ways are there to select a subcommittee of 7 members from among a committee of 21 and how many possible passwords are there if 7 of the letters of the alphabet can be used by the system?
for a two tailed hypothesis test of a difference of means with icircplusmn.05 and df30 we have the following critical
winning the jackpot in a particular lottery requires that you select the correct four numbers between 1 and 33 and in a
suppose we select an srs of size n 100 from a large population having proportion p of successes. let p be the
Suppose n = 5 and we observe the data (X1, Y1) = (3.7, 9.2),(X2, Y2) = (4.3, 9.4),(X3, Y3) = (5.0, 9.2),(X4, Y4) = (6.2, 10.4), and X5, Y5) = (5.3, 9.2). What is the conditional probability distribution of rs under H0 (8.1) when average ranks are use..
Find the probability that a randomly selected man will be shorter than 78.1 inches. Don't forget the diagrams for (b) and (c).
Test the whether the attitude toward keeping weight down associated with smoking status.
If possible. Find P( )
a machine makes a product with 5 of units having faults. in a sample of 20 units what is the probability that at least
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