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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.
there is some evidence suggesting that you are likely to improve your test score if you rethink and change answers on a
If the computed value of F is 5.01 and the critical value is 2.67, we would conclude that all the population means are equal. Unlike student’s t distribution, there is only one F distribution.
from a class survey approximately 32 of the students responding said that they have driven a vehicle while under the
A drawer contains eight pairs of socks. Ifsix socks are taken at randm and·without replacement. compute the probability that there is at least one matching pair among these six socks. Hint: Compute the probability that there is not a matching ..
explain how do you declare a variable as binary or integer in excel solver?1.briefly explain the results of a what-if
If you didn't, you'd primarily get women and older people. Comment on this approach to selecting a sample. How does the sampling procedure attempt to minimize certain types of bias? Are there sources of bias that may still be a concern?
Scientist decided to do a study on the population growth of rabbits. Inside a controlled environment, 1000 rabbits were placed - how many rabbits would be there
Is there evidence of a difference in the median performance between the two methods? (Use x = 0. 05).
What do we understand for measures of central tendency and what are some examples of measures of central tendency?
In the Cash Now lottery game there are 10 finalists who submitted entry tickets on time. From these 10 tickets three grand prize winners will be drawn.
an experimenter has prepared a drug dosge level that she claims will induce sleep for 80 of the people suffering from
buses arrive at a certain stop every 15 min starting at 7 a.m. a passenger arrives at the stop at a time that is
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