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A study if the impact of stress on the amount of beta-endorphins released in the blood was reported. Researchers took beta-endorphin levels for 19 patients 12 hours before surgery and again 10 minutes before surgery. If you assume that time before surgery (12 hrs vs. 10 minutes) is a manipulation of stress, does the data indicate that stress affects beta-endorphin levels in the blood? Use a two tailed hypothesis alpha =.05. The data are below.
Insert the mean and SD for the 12 hour and 10 minute condition below
Subject 12 hours 10 minutes
1 10 6.5
2 6.5 14.0
3 8.0 13.5
4 12.0 18.0
5 5.0 14.5
6 11.5 9.0
7 5.0 18.0
8 3.5 42.0
9 7.5 7.5
10 5.8 6.0
11 4.7 25.0
12 8.0 12.0
13 7.0 52.0
14 17.0 20.0
15 8.8 16.0
16 17.0 15.0
17 15.0 11.5
18 4.4 2.5
19 2.0 2.0
(1)State the null hypothesis:
(1)State the nondirectional alternative hypothesis:
Insert the appropriate values below
∑D= ∑D2= SSdif=
SSdiff=
(2) t=
(1) critical t=
What is the (conditional) probability that the sample will contain at least 2 aces, given that it contains (i) the ace of spades, (ii) at least one ace?
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How large a sample of workers should she take if she wishes to estimate the mean assembly time to within 20 seconds? Assume that the confi- dence level is to be 99%.
elliptical trainers are becoming one of the more popular exercise machines. their smoothand steady low-impact motion
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The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours.
Compute the two forecasts by using MAPD and indicate which seems to be more accurate.
It will take 30 minutes regardless of the traffic conditions. Lynn's utility for travel time is: U(15 minutes) = 0.9, U(30 minutes) = 0.7, and U(40 minutes) = 0.2. Which route will minimize Lynn's expected travel time?
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Bimodal distribution with a very large standard deviation for the population. For most teachers such a distribution makes the matter of how to teach very tricky.
You would prefer to have equal cash flows from the stock over the next two years. How can you create equally-sized home made dividends?
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