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Let X1, X2, and X3 be independent random variables, each uniformly distributed on the interval ° to 1. Determine the number a such that
(i) Plat least one of the numbers X1, X2, X3 is greater than a] = 0.9.
(ii) Plat least 2 of the numbers X1, X2, X3 is greater than a] = 0.9.
you have conducted a simple survey that has asked 100 people who have either attended an event n25 you promoted in the
To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within plus-or-minus 0.04 of the population proportion, how large a sample size is required?
Wechsler and Kuo (2000) used data from the 1999 College Alcohol Study to examine the relationship between student alcohol use and student definitions of binge.
Is the estimate from the participants significantly higher than the actual number (µ = 3.1)? Use a one-tailed test with = .05.
A person claims to be able to predict the outcome of flipping a coin. This person is correct 16/25 times. Compute the 95% confidence interval on the proportion of times this person can predict coin flips correctly.
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = . 05, does vehicle type vary by mall location?
Do you agree or disagree? Discuss briefly. Notes. "Baseline characteristics" are characteristics of subjects measured at the beginning of the study, i.e., just before randomization. The quote, slightly edited, is from Victora et al (2004).
Suppose a random sample of n = 15 observations is selected from a population that has normal distribution with mean 50 and standard deviation 10.
It's critical Find the appropriate critical value for constructing a confidence interval in each of the following settings.
Two teams are going to play a best-of-7 match (the match will end as soon as either team has won 4 games). Each game ends in a win for one team and a loss.
Is there evidence to suggest that the process average differs from the target value?
a hypothesis test for a population proportion p is given belowho p 0.25 vs.ha p ne 0.25 ne means not equalfor sample
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