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Do Now 9/3

Do Now 9/3. Write the percentages as a decimal. 1) 83% 2) 4.5% Write the decimals as a fraction in simplest form. 3) 0.55 4) 0.06 5) 0.135. C ommunication.

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Do Now 9/3

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  1. Do Now 9/3 Write the percentages as a decimal. 1) 83% 2) 4.5% Write the decimals as a fraction in simplest form. 3) 0.55 4) 0.06 5) 0.135

  2. Communication • To get reminders and updates about class and school events, subscribe to Remind using the following information: • *Academic Games: text @acdgames to 81010 • *Advanced Math: text @ophsadvmthto 81010 • *Probability & Statistics: text @kellystats to 81010 • You can also reference the class website for study resources: www.mrkellyophs.weebly.com

  3. An Overview of Statistics § 1.1

  4. Data and Statistics • Data consists of information coming from observations, counts, measurements, or responses. • Statistics is the science of collecting, organizing, analyzing, and interpreting data in order to make decisions. • A population is the collection of all outcomes, responses, measurements, or counts that are of interest. • A sample is a subset of a population.

  5. Populations & Samples • Example: • In a recent survey, 250 college students at Union College were asked if they smoked cigarettes regularly. 35 of the students said yes. Identify the population and the sample. Responses of all students at Union College (population) Responses of students in survey (sample)

  6. Parameters & Statistics • A parameter is a numerical description of a population characteristic. • A statistic is a numerical description of a sample characteristic. Parameter Population Statistic Sample

  7. Parameters & Statistics • Example: • Decide whether the numerical value describes a population parameter or a sample statistic. a.) A recent survey of 450 college students reported that the average weekly income for students is $325. Because the average of $325 is based on a sample, this is a sample statistic. b.) The average weekly income for all students is $405. Because the average of $405 is based on a population, this is a population parameter.

  8. Branches of Statistics • The study of statistics has two major branches: descriptive statistics and inferential statistics. Statistics Inferentialstatistics Descriptivestatistics Involves the organization, summarization, and display of data. Involves using a sample to draw conclusions about a population.

  9. Descriptive and Inferential Statistics • Example: • In a recent study, volunteers who had less than 6 hours of sleep were four times more likely to answer incorrectly on a science test than were participants who had at least 8 hours of sleep. Decide which part is the descriptive statistic and what conclusion might be drawn using inferential statistics. The statement “four times more likely to answer incorrectly” is a descriptive statistic. An inference drawn from the sample is that all individuals sleeping less than 6 hours are more likely to answer science question incorrectly than individuals who sleep at least 8 hours.

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