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On Tuesday, April 15th, 2014 Gallup reported that 43% of Americans approve of the job Barack Obama is doing as president. This proportion is based on phone surveys with approximately 1500 American adults.
By hand, compute a 95% confidence interval for the proportion of all American adults who approve of the job Barack Obama is doing as president. zc for a 95% confidence interval is 1.96.
By hand, compute and interpret a 99% confidence interval for the proportion of all American adults who approve of the job Barack Obama is doing as president. zc for a 99% confidence interval is 2.58.
What is happening to the range of the confidence intervals for presidential approval rating as the confidence level increases? Explain why this is happening.
find the 98 confidence interval for the difference between two means based on this information about two samples.
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Using sample, determine a 98% confidence interval for mean weight of whole daily output.
A new process has been implemented and it is stated to have an average cycle time of 120 seconds. A sample of 50 cycles yielded an average cycle time of 115 seconds, with a standard deviation of 2 seconds.
Plot the market-share data. (b) Describe the trend (if any) and discuss possible causes. (c) Fit three trends (linear, exponential, quadratic).
in this exercise practice some techniques and procedures related to regression analysis using data more or less from
a researcher conducts a hypothesis test to evaluate the effect of a treatment. the hypothesis test produces a z-score
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then lengths of a certain component are normally distributed with a mean of 250 mm and a standard deviation of .6mm.
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An oil co. is drilling some wells. the results are described as either a dry well or a producer well. Past experience suggests that 10% of exploratory wells are producer wells.
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