You will be using StatCrunch for Problems 31-34. Student researchers wanted to see whether a short delay between seeing a list of words and when people were asked to recall them would hinder memorization. The subjects were shown a list of words to memorize for 1 minute and were then given 1 minute to recall as many words as they could. Each subject did this once with no delay between memorizing and recall and another time with a 30-second wait between memorizing and recall. They were randomly assigned the order of the two conditions. The number of words memorized under each condition can be found in the StatCrunch data set MemorizingWords. QUESTIONS: 1. Is this an observational study or an experiment? 2. Explain how you know.
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In a study of memory recall, 8 students from a large psychology class were selected at random and given 10 minutes to memorize a list of 20 nonsensical words. Each was asked to list as many of the words as he or she could remember both 1 hour and 24 hours later. The data are as shown in the accompanying table. Student 1 2 3 4 5 6 7 8 1 hour later 14 13 19 7 12 11 17 15 24 hours later 9 4 14 5 9 7 12 11 Use these data to estimate the difference in mean number of words remembered after 1 hour and after 24 hours. Use a 90% confidence interval. (Use Ī¼d = Ī¼1 hour later ā Ī¼24 hours later. Use a table or technology. Round your answers to two decimal places.) ( , ) words
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List of words to memorize: A professor gives her students a list of words to recall as many of the words as they can; she takes away the list after an hour; she then asks one student to recite the information. What will this student likely be able to recall from the list? The student will recall only those terms that have the fewest letters. The student will remember those at the beginning of the list, showing a primacy effect. The student will remember those at the end of the list, showing a recency effect. The student won't recall any of the terms because he has not rehearsed enough to encode them.
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In a psychology experiment, a person could memorize x words in f(x) = 3x^2 - x seconds (for 0 ā¤ x ā¤ 10). (a) Find f'(x) by using the definition of the derivative. (b) Find f'(8). Interpret it as an instantaneous rate of change in the proper units. When 8 words have been memorized, the memorization time is increasing at a rate of 8 words per second. When f'(8) words have been memorized, the memorization time is increasing at a rate of 8 words per second. When f'(8) words have been memorized, the memorization time is increasing at a rate of 8 seconds per word. When 8 words have been memorized, the memorization time is increasing at a rate of f'(8) seconds per word. When 8 words have been memorized, the memorization time is increasing at a rate of f'(8) words per second.
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