Intro Stats
4th Edition
ISBN: 9780321826275
Author: Richard D. De Veaux
Publisher: PEARSON
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Textbook Question
Chapter R, Problem 6.50RE
Cramming Students in two basic Spanish classes were required to learn 50 new vocabulary words. One group of 45 students received the list on Monday and studied the words all week. Statistics summarizing this group’s scores on Friday’s quiz are given. The other group of 25 students did not get the vocabulary list until Thursday. They also took the quiz on Friday, after “cramming” Thursday night.
Then, when they returned to class the following Monday, they were retested—without advance warning. Both sets of test scores for these students are shown.
- a) Did the week-long study group have a
mean score significantly higher than that of the overnight crammers? - b) Was there a significant difference in the percentages of students who passed the quiz on Friday?
- c) Is there any evidence that when students cram for a test, their “learning” does not last for 3 days?
- d) Use a 95% confidence
interval to estimate the mean number of words that might be forgotten by crammers. - e) Is there any evidence that how much students forget depends on how much they “learned” to begin with?
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Chapter R Solutions
Intro Stats
Ch. R - Bananas Here are the prices (in cents per pound)...Ch. R - Prob. 1.2RECh. R - Prob. 1.3RECh. R - Dialysis In a study of dialysis, researchers found...Ch. R - Beanstalks Beanstalk Clubs are social clubs for...Ch. R - Bread Clarksburg Bakery is trying to predict how...Ch. R - State University Public relations staff members at...Ch. R - Prob. 1.8RECh. R - Prob. 1.9RECh. R - Streams As part of the course work, a class at an...
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R - Prob. 4.35RECh. R - Prob. 4.36RECh. R - Prob. 4.37RECh. R - Prob. 4.38RECh. R - Prob. 4.39RECh. R - 40. Coins A coin is to be tossed 36 times.
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