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The researcher later marks a 7mm long muscle on the thigh (the rectus femoris which occupies the middle of the thigh) of each study participant and injects the higher concentration (in the marked muscle area) to 15 of the runners (randomly selected from the 30). The lower concentration is injected in the marked muscle area of the remaining 15 participants.
The researcher later measures the length of the marked muscle in all 30 participants after 15 minutes of the injection and she wants to conclude whether the two concentrations of drug differ in their effect. The estimate she will be using is the difference in sample means.
The results were as follows: the mean muscle length for the high concentration was 14 mm, and for the low concentration, 9.5 mm.
The researcher knew from previous large-scale research that the value of the population standard deviation for the effect of the high concentration of the relaxant drug on muscle was: σH=0.7 mm, and the population standard deviation for the low concentration was: σL=0.6 mm.
What is the difference in means of the two samples?
What is the distribution of the sample proportion? Enter "binomial" or "normal" in blank #1.
question a market research team compiled the following discrete probability distribution for families residing in
1) We are 99% confident that the proportion of patients surveyed that have experienced a reduction in symptoms is between 0.2112 and 0.6638. 2) We are certain that 99% of patients will be between 0.2112 and 0.6638. 3) We cannot determine the proper..
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What is the mean of the grade point average rounded to the nearest tenth?
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
The categories of the first 30 persons interviewed, with G = college graduate and N = nongraduate, are shown in the sequence below. At the 0.10 level, evaluate the randomness of the sequence.
What's the approximate probability that your total is between 30 and 40 (that is, the average for the 10 dice is between 3 and 4)?
Assume that our tax assessor does not have the population standard deviations. Assume the assessor has a sample of data for 25 homes from neighborhood 1 and 25 homes from neighborhood 2.
Explain the discovery of penicillin? What is the difference between the light dependent and light independent reactions in photosynthesis?
The mean lifetime of light bulbs made by this manufacturer differs from 55 months? Can we conclude that the mean lifetime of light bulbs made here differs from 55 months?
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