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95% confidence interval for the proportion of adults who believes that economic conditions are getting better. A gallup poll taken estimates this proportion to be 0.33. What sample size is needed so that the confidence interval will have a margin of error of 0.032?
Margaret knows that the weekly average amount of time a student living in the dorms actually spends in the dorm follows a normal curve with mean of 92 hours with variance of 81 nationwide. What is the probability that a randomly chosen student has..
A business researcher wants to compare her observed distribution of frequency data to an expected distribution of data using the chi-square goodness-of-fit test.
This is a modification of Exercise. The risk of getting lung cancer at some point in one's life for men who have never smoked is about 13 in 1000.
As part of a new prevention program, a clinical psychologist wants to see whether feelings of alienation differ as a function of immigration status in a local high school.
Show that under the assumption of small percentage tolerances there is a simple formula for the approximate percentage tolerance of the product of two intervals in terms of the tolerances of the factors.
1. Why is it important to think carefully about decision situations that involve multiple conflicting objectives? 2. Explain the general decision-analysis approach to dealing with multiple objectives.
To what extent do syntax textbooks, which analyze the structure of sentences, illustrate gender bias? A study of this question sampled sentences from 10 texts.7 One part of the study examined the use of the words "girl," "boy," "man," and "woman."..
Would it be unusual for a return with income of $100,000 or more to be audited? What is the probability that two randomly selected returns with income of $100,000 or more will not be audited?
Find an equation of the least squares regression line. Please show your work. Is there a linear correlation between "x" and "y" at the 0.01 significance level? Please justify your answer.
i what is the sampling distribution of a sampe mean for a normally distributed random variable.ii if a variable iq is
a commuter train from long island to new york city is scheduled to arrive at 807 am every weekday morning. the
In this problem, we develop a weak law of large numbers for a correlated sequence X1, X2,... of identical random variables. In particular, each Xi has expected value E[Xi] = µ, and the random sequence has covariance function
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