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An ultramarathon, as you might guess, is a footrace longer than the 26.2 miles of a marathon. RUnners commonly develop respiratory infections after an ultramarathon. Will taking 600 milligrams of vitamin C daily reduce these infections? Researchers randomly assigned ultramarathon runners to receive either vitamin C or a placebo. Separately, they also randomly assigned these treatments to a group of nonrunners the same age as the runners. All subjects were watched for 14 days after the big race to see if infections developed.
(a) What is the name for this experimental design?
(b) Use a diagram to outline the design.
Does all statistical data have a mean, median, or mode? Why? When is the mean the best measure of central tendency? When is the median the best measure of central tendency?
To report their finding they want to create a 90% confidence interval. What would be the margin error for this confidence interval?
Scores by women on the SAT-I test are normally distributed with a mean of 998 and a standard deviation of 202. Scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6.
If garage is robbed, determine the probability doors were left open?
The histograms of some sampling distributions are symmetrical. T-F What would make a histogram symmetrical, and give an example of a symmetrical distribution? A random sample of size 36 is to be selected from a population that has a mean μ = 50 an..
Explain a few of the following on whatever topic you choose: decision tree, decision stragety, probability, forecasting, linear programming as it relates to work, life or interset.
Which of the following best explains how the F ratio examines differences among groups? A. The critical F is compared to the critical t.
Assume that the process is in control and that the population of all jar fills is normally distributed. (Round the z-values to 2 decimal places and final answer to 4 decimal places. Negative amounts should be indicated by a minus sign.)
What can you tell me about the direction, strength and significance of this association and What would you expect for somebody without any formal education whatsoever and what can you tell me about the nature of this relationship?
Suppose a one tailed t test is being applied to find out if the population mean is less than $120. The level of significance selected is 0.01 and 26 bank accounts were sampled.
Give the regression model for predicting a person's height from his or her weight. Interms of these variables, explain what the slope of this model represents here
question in a completely randomized design 10 experimental units were used for the first treatment 12 for the second
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