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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.
A) Find the value of the standard error of the sample proportion.
B) Find a 90% confidence interval estimate of the population proportion that thinks it should be illegal to use a cell phone while driving.
If X and Y are two independent Poisson random variables, then show that the conditional distribution of X given X+Y is binomial.
Recent studies have shown that the super-cooling temperature of terrestrial frogs frozen at -6°C has a relative frequency distribution with a mean of - 2°C and a standard deviation of 0.3°C (The first of these studies was reported in Science, May ..
The first three digits of a university telphone exchange are 452. if all the sequences of the remaining four digits are equally likely, what is the probability that a randomly selected universtiy phone number contains seven distinct digits?
Suppose the population standard deviation is a=25. (The a is actually the funny looking 0 with the line that goes from the top right up at an angle) Compute the standard error of the mean
Compute the pdf of continuous random variable Z where Z = X + Y and X is a continuous random variable uniformly distributed on [0, 2] and Y is a continuous random variable uniformly distributed on [0, 4]. Assume that X and Y are independent.
The mean return for the random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Test the null hypothesis: H0: mu = 15% at α = 0.05.
A statistical analysis of 1,000 long-distance calls made from the headquarters of the Bricks and Clicks Computer Corporation indicates that the length of these calls is normally distributed with μ = 240 seconds and σ = 40 seconds.
There is a probability that the river will flood next year. Riverside's profits for the coming year depend on whether Laura buys the flood insurance and whether the river floods.
Determine the probability that none of the calculators will be defective?
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sam..
The times for 300 college students of introductory statistics to complete a one-hour times exam.
Find out the least-squares regression line and interpret its slope.
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