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A meat processing plant has processed an average of 100 tons per day for the last several years. Newer processing machines have been installed recently. The quality control manager would like to know whether this average has improved. She randomly selects 40 days from the computer database and computes the average and standard deviation of n = 40 days to be 105 tons and 8 tons, respectively. Is this an experiment or an observational study and why?
Given a normal distribution of data, we know from the Empirical Rule that in between 2 standard deviations from the mean
Choose the correct answer using sum of squared error (SSE).
Describe what the researcher must do if one of the requirements is not met and give illustrations.
Assume that the cost for this type of hospital emergency room visit is normally distributed with a standard deviation of $92. Assume that the following questions about the cost of a hospital emergency room visit for this medical service.
Expireall Corporation is in finishing business. The following data took place during September: The standard cost card indicates that 2.0 feet are used in the production of each unit. The standard cost of each material is $4.50 per foot.
Some IQ tests are standardized to normal model with mean of 100 and the standard deviation of 16. Draw a model for these IQ scores, clearly label it , showing what the 65-95-99.7 rule predicts about the score.
Choose the correct conclusion regarding the claim that the weights of statistics text vary more than the weights of text in general.
Automobile manufacturers are interested in the difference in reaction times for drivers reacting to traditional incadescent lights and to LED lights.
Suppose the probability of a boy being born is the same as the probability of a girl being born. Find the probability that a family with three children will have two boys and one girl.
(A) At the 0.05 level of significance, use the six step critical value approach to hypothesis testing to try and prove that the 2004 proportion has increased. (B) Use the 5 step p-value approach. Interpret the meaning of the p value.
Using classical methods discussed in class, try to estimate the probability of winning.
The 'interaction effect' was also important. By using the means in the table above write a statement explaining how the anti-anxiety drug appears to affect anxiety. Are the outcomes consistent with the hypothesis proposed by the researchers?
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