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Question: 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 2
5 4
3 0
2 4
4 3
3 1
6 4
When the data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure, the variable has which scale of measurement
What is the opportunity loss of spending 4 hours per week on average studying for the exam when the exam turns out to be easy?
A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately describes the measures of central tendency?
Where S, A, and R are measured in dollars per week. Vanguard's marketing director is comfortable using parameter estimates that are statistically significant at the 10% level or better.
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Suppose 37% of a company's computer keyboards are manufactured in Los Angeles, and 63% in Detroit. Suppose 2% of the keyboards made in Los Angeles.
Statistical Quality in an Organization
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