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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?
Compute an F-statistic for each linear construct and determine its significance.
Select the level of significance, and determine critical, ZCR value.
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
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She wants to be 90% confident and be accurate within 5% of the true proportion. Find out the minimum sample size necessary.
I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output, The degrees of freedom for the t test for the slope are
What are the odds against drawing a card from an ordinary deck of cards and getting a spade?
Based on the expected value of the lottery ticket, would you pay $1 for a ticket? Round the answer to 3 decimal places. Omit the "tiny_mce_markerquot; sign in your response.)
Modify above problem (Problem 8th) so that each hardware vendor now demands seventy-five (75) units. Any units available from the vendors that are not shipped cost nothing.)
What is the 99% confidence interval?
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