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1. Guinea Pig Lifetimes. Use the Welch t -tools to find a two-sided p-value and confidence inter- val for the effect of treatment on lifetimes of guinea pigs in Chapter 2, Exercise 11. Does the additive treatment effect seem like a sensible model for these data?
2. Schizophrenia Study. (a) Draw a histogram of the differences in hippocampus volumes in Display 4.12. Is there evidence that the population of differences is skewed? (b) Take the logarithms of the volumes for each of the 30 subjects, take the differences of the log volumes, and draw a histogram of these differences. Does it appear that the distribution of differences of log volumes is more nearly symmetric? (c) Carry out the paired t -test on the log-transformed volumes. How does the two-sided p-value compare with the one obtained on the untransformed data? (d) Find an estimate of and 95% confidence interval for the mean difference in log volumes. Back-transform these to get an estimate and confidence interval for the median of the population of ratios of volumes.
a common test for extrasensory perception esp asks subjects to identify which of four shapes star circle wave or square
Replacement times for CD players are normally distributed with mean of 7.1 years and a standard deviation of 1.4 years (based on data from "Getting Things Fixed," Consumer Reports). Find the probability that a randomly selected CD player will have..
One month of the true difference and with 95% confidence if the range of all the data is 6 years? Use the appropriate tables in your book.
Discuss the use of standard deviation. Explain how it might be useful to you in your research and how you would explain results using standard deviation.
Now that you are familiar with the basic concepts of statistics, what are some examples of when you have seen or heard statistics used inappropriately?
How can we be certain that surveys and statistics that we hear about in the media are accurate samples and unbiased? Is there a way to dissect the information and determine if a probability sample was used?
The Scatter plot can more easily be generated using the Chart procedure.
In a Little League baseball game, team A s pitcher throws a strike 50% of the time and a ball 50% of the time, successive pitches are independent of one another, and the pitcher never hits a batter. Knowing this, team B s manager has instructed th..
a manufacturer claims that its wood treatment protects outdoor wood fences a mean of 2601 days with a standard
gmat graduate management admissions test scores are normally distributed with a mean of 500 and a standard deviation of
a clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug
A researcher hypothesizes that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability, µ =58.A random sample of 14 individuals who listen..
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