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A political candidate has hired a polling firm to as sess her chances of winning a senatorial election in a large eastern state. She wants an estimate of the pro portion of registered voters that would vote for her "if the election were held today." Registered voters are to be randomly chosen and interviewed, and their prefer ences recorded. The polling firm will use the outcome of X as an estimate of the proportion of voters in favor of the candidate. It is known that currently between 40 percent and 60 percent of the registered voters favor her in the election. She wants to have an estimate that is within 2 percentage points of the true proportion with probability = .99. How many registered voters must be interviewed, based on the asymptotic distribution of X?
The mean noise level for 24 hospital operating rooms was 56.3 dBA and the standard deviation was 7.5 dBA. At α = .05 can it be concluded that there is a difference in means?
find the area under the standard normal curve which lies between z 0.72 and z
suppose that there are a total of 18 students in an elementary school class. the teacher assigns each of the students a
the director of an advertising agency is concerned with the effectiveness of a television commercial.what null
the average age for licensed drivers in a county is micro 42.6 ? 12 and the distribution is approximately normal. a
q1. which of the following is an example of quantitative data? the players number on a baseball uniform the serial
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability. Suppose that E and F are two events and that P(E and F) = 0.21 and P(E) = 0.4. What is P(FE)?
True or False? Bivariate correlation coefficient always has same sign as b 1 in Y = b 0 + b 1 X.
To make a p-chart for the nonconforming units. The coating of the candy bar is currently make by a process which can result in surface cracking.
16 parts are examined for defects. It is found that 10 are good, 4 have minor defects, and 2 have major defects What is the probability that both are good? What is the probability that exactly one part has a major defect?
the number of customers at quiet morning bakery is believed to follow a poisson distribution with a mean of 2 customers
For a normal random variable X with mean 70 and standard deviation 10. Calculate the probability that 60 80}.
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