tema Ivehypothesis is correct.In a fixed level a significance test, the probability of a Type I error is thesignificance level a.Section 9.1ExercisesIn Exercises 1 to 6, each situation calls for a significancetest. State the appropriate null hypothesis Ho andalternative hypothesis Ha in each case. Be sure to defineyour parameter each time.handed. He wonders if the proportion of lefties athis large community college is really 12%. Simonchooses an SRS of 100 students and records whethereach student is right- or left-handed.Don't argue! A Gallup Poll report revealed that72% of teens said they seldom or never argue withtheir friends.' Yvonne wonders whether this resultholds true in her large high school. So she surveys arandom sample of 150 students at her school.1.Attitudes The Survey of Study Habits and Attitudes(SSHA) is a psychological test that measures students'attitudes toward school and study habits. Scoresrange from 0 to 200. The mean score for U.S. collegestudents is about 115. A teacher suspects that olderstudents have better attitudes toward school. She gives4.pg 540Cold cabin? During the winter months, the temper-atures at the Colorado cabin owned by the Starnesfamily can stay well below freezing (32°F or 0°C) forweeks at a time. To prevent the pipes from freezing,Mrs. Starnes sets the thermostat at 50°F. The manu-5.the SSHA to an SRS of 45 of the over 1000 studentsat her college who are at least 30 years of age.Anemia Hemoglobin is a protein in red blood cellsthat carries oxygen from the lungs to body tissues.People with less than 12 grams of hemoglobin perdeciliter of blood (g/dl) are anemic. A public healthofficial in Jordan suspects that Jordanian children areat risk of anemia. He measures a random sample of50 children.2.facturer claims that the thermostat allows variation inhome temperature of o = 3°F. Mrs. Starnes suspectsthat the manufacturer is overstating how well thethermostat works.Ski jump When ski jumpers take off, the distancethey fly varies considerably depending on theirspeed, skill, and wind conditions. Event organizers6.3.Lefties Simon reads a newspaper report claimingthat 12% of all adults in the United States are left-返回第490 页

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hypothesis is correct. In a fixed level a significance test, the probability of a Type I error is the significance level a. Section 9.1 Exercises In Exercises 1 to 6, each situation calls for a significance test. State the appropriate null hypothesis Ho and alternative hypothesis Ha in each case. Be sure to define your parameter each time. handed. He wonders if the proportion of lefties at his large community college is really 12%. Simon chooses an SRS of 100 students and records whether each student is right- or left-handed. Attitudes The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students' attitudes toward school and study habits. Scores range from 0 to 200. The mean score for U.S. college students is about 115. A teacher suspects that older students have better attitudes toward school. She gives the SSHA to an SRS of 45 of the over 1000 students at her college who are at least 30 years of age. Don't argue! A Gallup Poll report revealed that 72% of teens said they seldom or never argue with their friends. Yvonne wonders whether this result holds true in her large high school. So she surveys a random sample of 150 students at her school. 1. 4. pg 540 Cold cabin? During the winter months, the temper- atures at the Colorado cabin owned by the Starnes family can stay well below freezing (32°F or 0°C) for weeks at a time. To prevent the pipes from freezing, Mrs. Starnes sets the thermostat at 50°F. The manu- 5. 2. Anemia Hemoglobin is a protein in red blood cells that carries oxygen from the lungs to body tissues. People with less than 12 grams of hemoglobin per deciliter of blood (g/dl) are anemic. A public health official in Jordan suspects that Jordanian children are at risk of anemia. He measures a random sample of 50 children. facturer claims that the thermostat allows variation in home temperature of o = 3°F. Mrs. Starnes suspects that the manufacturer is overstating how well the thermostat works. Ski jump When ski jumpers take off, the distance they fly varies considerably depending on their speed, skill, and wind conditions. Event organizers 6. Lefties Simon reads a newspaper report claiming that 12% of all adults in the United States are left- 3. 返回第490页