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Chapter 9: Q.100 (page 592)
You are testing against based on an SRS of observations from a Normal population. The statistic is . The -value
(a) falls between
(b) falls between
(c) falls between
(d) falls between .
(c) is greater than.
(a) The - value falls between .
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Attitudes The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students鈥� attitudes toward school and study habits. Scores range from . The mean score for U.S. college students is about . A teacher suspects that
older students have better attitudes toward school. She gives the SSHA to an SRS of of the over students at her college who are at least years of age. Check the conditions for carrying out a significance test of the teacher鈥檚 suspicion.
Is your food safe? Do you feel confident or not confident that the food available at most grocery stores is safe to eat? when a gallup poll asked this question, of the sample said they were confident." Callup announced the poll's margin of error for confidence as percentage points. Which of the following sources of error are included in this margin of error? Explain.
(a) Gallup dialed landline telephone numbers at random and so missed all people without landline phones, including people whose only phone is a cell phone.
(b) Some people whose numbers were chosen never answered the phone in several calls or answered but refused to participate in the poll.
(c) There is chance variation in the random selection of telephone numbers.
Pressing pills A drug manufacturer forms tablets by compressing a granular material that contains the active ingredient and various fillers. The hardness of a sample from each batch of tablets produced is measured to control the compression process. The target value for the hardness is . The hardness data for a random sample of tablets are
Is there significant evidence at the level that the mean hardness of the tablets differs from the target value? Carry out an appropriate support your answer.
To determine the reliability of experts who interpret lie detector tests in criminal investigations, a random sample of such cases was studied. The results were
(a) .
(b) .
(c) .
(d) .
(e) .
What is significance good for? Which of the following questions does a significance test answer? Justify your answer.
(a) Is the sample or experiment properly designed?
(b) Is the observed effect due to chance?
(c) Is the observed effect important?
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