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In a 1997 Marist Institute survey of 935 randomly selected Americans, 60% of the sample answered yes to the question, "Do you think there is intelligent life on other planets?" (a) What is the sample proportion of Americans who believe there is intelligent life on other planets? (b) What is the standard error of the sample proportion? (c) Calculate a 90% CI for the population proportion of Americans who believe there is intelligent life on other planets.
A teacher gives a pre and post test to her students, she wants to know if there is a difference in the number of points students earned on their pretest and post test.
Compare two month moving average also exponential smoothing using MAD. The subsiquent data represents demand for company ABC's products for the last 10 months.
The confidence interval estimate of the population mean will be __________ for a 95% confidence level than for a 90% confidence level. Narrower or Wider?
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?
What is meant by the probability of an event? Discuss how addition and multiplication techniques are used to solve probability problems.
A manufacturer of automobile transmissions uses three different processes. The management ordered a study of the production costs to see if there is a difference among the three processes. A summary of the findings is shown below.
When is it important to have matched pairs rather than two independent sets of data?
When the null hypothesis is rejected in the goodness-of-fit test, it means there is close agreement between the observed and expected frequencies.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of -1.34? a) strong linear correlation b) weak linear correlation c) impossible, d) calculation error no linear correlation
Jessica must finish two courses (much like myself), statistics and economics, in order to complete the requirements for a BA degree. All along she has maintained an 80% average.
A manager at a local manufacturing company has been monitoring the output of one of the machines used to manufacture small aluminum plates.
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