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Question: A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the population proportion of voters who feel the economy is the most important.
1. Define the random variable X in words.
2. Define the random variable P′ in words.
3. Which distribution should you use for this problem?
4. Construct a 90% confidence interval, and state the confidence interval and the error bound.
5. What would happen to the confidence interval if the level of confidence were 95%?
Prepare a time series plot, ACF and PACF for these data. Is there evidence to suggest that the data should be differenced? Explain.
What are the critical values for z on a one-tailed test if alpha = .01? .001? What would the critical values be at both levels of significance if it was a two-tailed test?
One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Caculate expectations of X and Y: E(X)=?
If they selected new random samples of 100 males and 100 females, would the average salaries of those samples be $51,000 and $49,500? Explain.
Estimated sales resulting from a $15,000 investment in inventory and an advertising budget of $10,000. Interpret b1 and b2 in this estimated regression equation.
Calculate the test statistic and Find expected frequencies - Identify the claim and state the null and alternative hypotheses and determine the degree of freedom, find the critical value, and identify the rejection region.
find the value ofnbspznbspthat would be used to test the difference between the proportions given the following. use g
Assuming that the data constitute independent random samples from normal populations with equal variances, construct a 99% confidence interval for the difference between the true average heat-producing capacities of coal from the two mines
the mean score of the first calculus exam was 81. the standard deviation was 12. find the smallest interval about the
Suppose that a random requisition is found to have been incorrectly entered. What is the probability that it was processed by data entry specialist 3?
A new process for producing synthetic diamonds can be operated at a profitable level only if the average weight of the diamonds produced by the process is greater than 0.5 karat.
Queries presented to a computer database are a Poisson process of rate λ = 6 queries per minute. An experiment consists of monitoring the database for m minutes and recording N(m), the number of queries presented. The answer to each of the followi..
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