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As discussed in the text, it often is possible to use a theoretical distribution as an approx imation of the distribution of some sample data. It is always important, however, to check to make sure that your data really do fit the distribution you propose to use.
Consider the halfway-house data again. We calculated the sample mean x- = 380.4 and the sample standard deviation s = 217.6. Taking these as approximately equal to μ and σ, use the Z table in Appendix E to find normal cumulative probabilities for dollar costs of 200, 300, 400, 500, 600, and 700. How do these theoretical normal probabilities compare with the data-based probabilities from the CDF in Figure 10.4? Do you think that the normal distribution is an appropriate distribution to use in this case? You might sketch the normal distribution CDF and superimpose it on Figure 10.4 to obtain a visual feel for how the normal distribution fits the data.
a medical research project examined the relationship between a subjects weight and recovery timefrom a surgical
The populations must all be normally distributed, what is meant by normally distributed?
the amounts in ounces of juice in eight randomly selected juice bottles are15.2 15.7 15.9 15.9 15.1 15.5 15.7
raquet brand sample size sample mean sample st. deviationprince 150 980 1.5head 150 1005 21. does the data provide
Give the formula for the proper statistic to use, and also the p-value and An experiment was conducted to compare the weights of the combs of roosters fed two different vitamin-supplemented diets
Medium-sized college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your results.
the following data set gives the scores of 50 students of an engineering exam. the results are shown below. test at the
you are standing in line at the super market when a scientist standing behind you strikes up a conversation with you.
Tourism is one consideration for a company's future. A survey of 1,233 visitors to China last year revealed that 110 people visited a Starbucks during their visit.
The times for 300 college students of introductory statistics to complete a one-hour times exam.
suppose a point xy is chosen at random from the disk x2 y2 is less than and equal to 1. find the a marginal density of
determined from the test in Part (b) and test the homogeneity of the six response curves. State the conclusion of the test and give the model you have adopted at this stage.
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