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Solved: Scores on the math SAT are normally distributed. A

Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi ISBN: 9780073401331 38

Solution for problem 7E Chapter 6.11

Statistics for Engineers and Scientists | 4th Edition

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Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi

Statistics for Engineers and Scientists | 4th Edition

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Problem 7E

Problem 7E

Scores on the math SAT are normally distributed. A sample of 20 SAT scores had standard deviation s = 87. Someone says that the scoring system for the SAT is designed so that the population standard deviation will be σ = 100. Do these data provide sufficient evidence to contradict this claim?

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2/29  CH 29 How plants colonized the land  the terrestrial surface was lifeless  cyanobacteria and protists show up on land  plants have diversified into roughly 290,000 species  plants are defined as having terrestrial ancestors  land plants do not include photosynthetic protists  plants supply oxygen and are the ultimate source of most food  green algae called charophytes are the closest relatives of land plants***********  lots of characteristics appear in some algae o rings of cellulose­synthesizers o have sperm that swim  both nuclear and chloroplast genes point to charophytes as the closest living relatives of land plants  sporopollenin is a layer of a durable polymer that prevents charophytes and zygotes from drying out  also found in spore walls  land plants diversified as adaptations evolved that enabled them to thrive despite challenges  the placement of the boundary dividing land plants from algae is the subject of ongoing debate  until this debate is resolved, we define plants as embryophytes­­­ plants with embryos  alternation of generations o gametophyte­haploid and produces gametes o sporophyte­ produces spores  multicellular dependent embryos o see both the parent and the embryo in a seed  Walled spores produced in sporangia o the sporophyte produces spores in organs called sporangia o diploid cells called sporocytes undergo meiosis to generate haploid cells o sporopollenin  Multicellular Gametangia o female­ archegonia o male­ antheridia  apical meristems o in the roots  cuticle­ waxy covering of epidermis  stomata­ cells that allow for gas exchange  plants on land are at least 470 million years old  land plants can be categorized by the presence of vascular tissue  THERE WILL BE AT LEAST ONE QUESTION ABOUT ONE OF THE LIFE CYCLES (SOMETHING MAJOR)  Importance of mosses o help retain nitrogen 3/2  giant lycophyte trees thrived for millions of years in moist swamps  ferns are the most widespread seedless vascular plants with more than 12,000 species  horsetails were but now only have one genus CH 30  a seed consists of an embryo with a coat of nutrients  seed plants have o reduced gametophytes o heterospory o ovules o pollen  the gametophytes develop within the wall of spores  look at plant group table  Heterospory  ancestor seed plants were likely homosporous  Megasporangia produce megaspores that give rise to female gametophytes  microsporangia produce microspores that give rise to male gametophytes  ovule is a megasporangium, megaspore, and one or more protective integuments  microspores develop into pollen grain  pollination is the transfer of pollen to the part of a seed plant containing ovules  pollen eliminates that need for a film of water  a seed develops from the whole ovule  is a sporophyte embryo along with its food supply, packaged in a protective coat  seeds provide some evolutionary advantages over spores  gymnosperms means “naked seeds”  seeds are exposed on cones  angiosperms are fruits which are mature ovaries  BETWEEN 3 AND 6 QUESTIONS ON THE DIFFERENT LIFE CYCLES OF PLANTS  life cycle of a pine: o 3 key features are miniaturization of their gametophytes, o development of seeds from fertilized ovules o the transfer of sperm to ovules by pollen  pine tree is the sporophyte and produces sporangia in male and female cones  some plants begin to develop these modern features in the Devonian period  gymnosperms start early in the fossil record about 305 million years ago  gymnosperms were better suited to drier conditions than nonvascular plants  served as food for herbivores  insects started pollinating over 100 million years ago  angiosperms ended up replacing gymnosperms  angiosperms now dominate though conifers still dominate some regions  gymnosperms have 4 phyla o cycadophyta­ flagellated sperm, palm like leaves o gingkophyta­ flagellated sperm, high tolerance to air pollution o gnetophyta­ vary in appearance, live in tropics or in deserts o coniferophyta­ largest of the gymnosperm phyla, evergreens  angiosperms are seed plants with reproductive structures called flowers and fruits  they are the most widespread and diverse of all plants  all angiosperms are classified in a single phylum, Anthophyta  two key adaptations o flowers o fruits  flower is an angiosperm structure specialized for sexual reproduction  pollinated by insects or animals or wind  flower is specialized shoot with up to four types of modified leaves o sepals, enclose the flower o petals, attract the pollinators o stamens, produce pollen o carpels, produce ovules

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Chapter 6.11, Problem 7E is Solved
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Textbook: Statistics for Engineers and Scientists
Edition: 4
Author: William Navidi
ISBN: 9780073401331

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Solved: Scores on the math SAT are normally distributed. A