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Vehicles heading west on Front Street may turn right, left or go straight ahead at elm street. The city traffic engineer believes that half to the vehicles will continue straight through the intersection. On the remaining half, equal proportions will turn right and left. Two hundred vehicles were observed,with the following results. Use the .10 significance level. Can we conclude that the engineer is correct?
Chart: Frequency straight 112, right turn 48, left turn 40
Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000
One thing you have learned is that the tangency portfolio will give you the maximum Sharpe ratio. Consequently, you have constructed such a portfolio. What are you portfolio weights.
State one referenced hypothesis including the three variables (FA as an IV, age as the covariate and RS as the DV)
Use this poll result to give 70%, 80%, 90% and 99% confidence intervals for the proportion of all adults who feel this way. What do your results show about the effect of changing the confidence level? (Use Excel)
Four different assembly processes were under consideration. Sixteen workers were randomly assigned to the four processes, eight per process. The number of correctly assembled units in an eight-hour work shift was recorded:
The difference between expected payoff under certainity and expected value of the best act without certainity is the expected:
Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits?
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
Construct a 95% confidence interval estimate for the proportion of all workers who did not use the Internet within limits. Explain your findings so that your non-quantitative partner will understand them.
Hours worked is important predictor of amount of sales.
Identify the variable being measured and describe the sample as it relates to the population.
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
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