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Our bodies have a natural electrical field that is known to help wounds heal. Does changing the field strength slow healing? A series of experiments with newts investigated this question. In one experiment, the two hind limbs of 12 newts were assigned at random to either experimental or control groups. This is a matched pairs design.
The electrical field in the control limbs was reduced to zero by applying a voltage. The "experimental" limbs were left alone, so that they still had the natural electric field.
If it is true that the electric field helps healing, than the healing times for the control group should be bigger than the healing times for the experimental group. Here are the rates at which new cells closed a razor cut in each limb, in micrometers per hour:
Carry out a t-test to see if the mean healing rate is significantly lower in the experimental limbs, including all 12 newts. What are the test statistics and their P-values?
Based on a scatter diagram, would you estimate the linear correlation coefficient to be:
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
Research question : At α = . 01, is degree of certainty independent of credits earned?
A sample of twenty automobiles was taken, and the miles per gallon (MPG), horsepower, and total weight were recorded. Develop a linear regression model to predict MPG using horsepower as the only independent variable. Develop another model with weig..
The study does not give sufficient evidence to support the claim that less than 75% of college students spend less than $250 per semester on textbooks.
Polls showed the two main candidates in 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has a margin of error of less than 1%.
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
The average age of the women was 45.582 with a standard deviation of 5.143. He uses this information to calculate a 95% confidence interval for the differnce in means, (-11.41, -5.422). The best interpretation of this interval is which of the foll..
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
If the weight distribution is known to be normally distributed, do the data support the veterinarian's suspicion? Conduct a hypothesis test at the 5% significance level. Define your parameter (μ), state your hypotheses, conduct the test and write ..
Find out coefficient of correlation between variables. Interpret the value.
write down the hypothesis the test used the p-value and the interpretation then hand calculates a 95% CL for the odds ratio estimate on this last test.
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