Chapter 11: Q.3 (page 692)
Aw, nuts! Calculate the chi-square statistic for the data in Exercise . Show your work.
Short Answer
From the given information, the test statistics are
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Chapter 11: Q.3 (page 692)
Aw, nuts! Calculate the chi-square statistic for the data in Exercise . Show your work.
From the given information, the test statistics are
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Seagulls by the seashore Do seagulls show a preference for where they land? To answer this question, biologists conducted a study in an enclosed outdoor space with a piece of shore whose area was made up of % sand, % mud, and % rocks. The biologists chose seagulls at random. Each seagull was released into the outdoor space on its own and observed until it landed somewhere on the piece of shore. In all, seagulls landed on the sand, role="math" localid="1650465230449" landed in the mud, and role="math" localid="1650465221489" landed on the rocks. Carry out a chi-square goodness-of-铿乼 test. What do you conclude?
No chi-squareThe principal in Exercise also asked the random sample of students to record whether they did all of the homework that was assigned on each of the 铿乿e school days that week. Here are the data:

Explain carefully why it would not be appropriate to perform a chi-square goodness-of-铿乼 test using these data.
Yahtzee In the game of Yahtzee, six-sided dice are rolled simultaneously. To get a Yahtzee, the player must get the same number on all dice.
(a) Luis says that the probability of getting a Yahtzee in one roll of the dice is . Explain why Luis is wrong.
(b) Nassir decides to keep rolling all 5 dice until he gets a Yahtzee. He is surprised when he still hasn鈥檛 gotten a Yahtzee afterrolls. Should he be? Calculate an appropriate probability to support your answer .
Researchers looked at a random sample of full-page ads that show a model in magazines aimed at young men, at young women, or at young adults in general. They classified the ads as 鈥渘ot sexual鈥 or 鈥渟exual,鈥 depending on how the model was dressed (or not dressed). Here are the data:

The figure below displays Minitab output for a chi-square test using these data

a) Which type of chi-square test should be used in this case? Justify your answer.
(b) State an appropriate pair of hypotheses for the test you chose in part (a).
(c) Show how each of the numbers and was obtained for the 鈥渘otsexy, Women鈥 cell
(d) Assuming that the conditions for performing inference are met, what conclusion would you draw? Explain
No chi-square A school鈥檚 principal wants to know if students spend about the same amount of time on homework each night of the week. She asks a random sample of students to keep track of their homework time for a week. The following table displays the average amount of time (in minutes) students reported per night:

Explain carefully why it would not be appropriate to perform a chi-square goodness-of-铿乼 test using these data.
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