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A researcher wished to compare the effect of two stepping heights (low and high) on heart rate in a step-aerobics workout. A collection of fifty adult volunteers was randomly divided into two groups of twenty-five subjects each. Group 1 did a standard step-aerobics workout at the low height. The mean heart rate at the end of the workout for the subjects in Group 1 was x1 = 90.00 beats per minute with a standard deviation s1 = 9 beats per minute. Group 2 did the same workout but at the high step height. The mean heart rate at the end of the workout for he subjects in Group 2 was x2 = 95.08 beats per minute with a standard deviation s2 = 12 beats per minute. Assume that two groups are independent and the data are approximately normal. Let µ1 and µ2 represent the mean heart rates we would observe for the entire population represented by the volunteers, if all members of this population did the workout using the low or high step height, respectively. Suppose the researcher had wished to test the hypotheses H0: µ1 = µ2 and Ha: µ1 < µ2. The P-value for the test is (use conservative value for the degrees of freedom)
A. between 0.01 and 0.05.
B. between 0.05 and 0.10.
C. larger than 0.10.
Suppose a well-known baseball player states that, at this stage of his career, he is a "300 hitter" or better. That is, he claims that he gets a hit in at least 30% of his at-bats. Over the next month of the baseball season, this player has 105 at..
what sample size should be used in the funding decision study? Use σ = $4000 as a planning value. ________________
on the average mr. z drinks and drives once in 4 years. he knows that every time when he drinks and drives he is caught
The Bureau of the Census reports that the average commuting time for citizens of both Baltimore, Maryland, and Miami, Florida is approximately 29 minutes (uMiami=29 and uBaltimore=29 minutes).
Assuming the sigma of 200 was actually the standard deviation for the sample, recalculate the interval estimate. Discuss how this changed your result from that in part b.
Either direction from what would have been obtained by interviewing all voters in the United States. Find the sample size suggested by this statement.
A normal distribution has a mean of 50 and a standard deviation of 4. Compute the probability of a value between 44.0 and 55.0. Compute the probability of a value greater than 55.0.
specimens of blood from 10 different animals were analyzed for blood count say y in units of 100 and packed cell volume
The sample mean life is 5.5 years with a standard deviation of 0.6 years. If you were constructing a 99% two-sided confidence interval estimate, the lower limit would be?
A sample of 200 traffic accidents this year showed 74 persons were also involved in another accident within the last five years. Use the .01 significance level. Can we use z as the test statistic? Tell why or why not.
what is the major difference between the dominance criterion and other decision-making criteria under
Write the stems again, and rearrange the leaves in increasing order out from each stem. We are interested in the distribution of the data? What would be appropriate to display this?
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