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How does sleep affect memory? To find out, eight students learned a list of 10 nonsense words. For the next 4 hours, half of them slept and half engaged in daytime activities. Then each was tested on the list. The next day everyone learned a new list. Those who had slept did daytime activities and those who were awake the day before slept for 4 hours.
Each recalled the new list. The table shows the number of words each person recalled under the two conditions.
Establish a 95 percent confidence interval about the difference between the two means, and write an interpretation that includes a statement about the fate of the null hypothesis when a =.05. (Based on a 1924 study by Jenkins and Dallenbach.)
Asleep
Awake
4
2
3
5
0
1
6
In a survey of the 3000 boy scouts in the National Capital Area Council (NCAC), it is found that they have a mean weight of 135 lbs with a standard deviation of 15 lbs. How many of the boy scouts have weights between 120 lbs and 150 lbs.?
In the United States, billions of dollars are spent annually for solid waste collection and disposal. One system, which uses a remote control pick-up arm for collecting waste bags, is shown in Figure P9.19. The loop transfer function of the remote..
To qualify for security officers training, recruits are tested for stress tolerance. The scores are normally distributed with a mean of 62 and a standard deviation of 8. If only the top 15% of recruits are selected, find the cut-off score. What is..
Find the standard deviation for the given sample data. Round your answer to one more decimal place than is present in the original data.
Find out the operating characteristics for this system.
Evaluate a simple aggregate price index for 2004. Use 2000 as the base period - Estimating the simple aggregate price index.
Create a 95% confidence interval for proportion of highly educated women who left careers for family reasons and who wish to return to work.
What is the seller's expected revenue in both auctions and does revenue equivalence still hold?
Data from the Motor Vehicle Department indicate that 80% of all licensed drivers are older than age 25. In a sample of n=60 people who recently received speeding tickets, 38 were older than 25 years and the other 22 were age 25 or younger.
assume that a simple random sample has been selected from a normally distribution population and test the given claim.
Choose a point at random in the square with sides 0 ≤ x ≤ 1 and 0 ≤ y ≤ 1. This means that the probability that the point falls in any region within the square is the area of that region.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
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