Types of Statistical Studies - Mrs. Jimenez Loves Math

Types of Statistical Studies - Mrs. Jimenez Loves Math

Types of Statistical Studies Math 075 Summer 2016 Population Vs. Sample Wed like to know about an entire population of individuals, but examining all of them is usually impractical, if not impossible. We

settle for examining a smaller group of individualsa sample selected from the population. Population Vs. Sample Sampling is a natural thing to do. Think about sampling something you are cooking you taste (examine) a small part of what youre cooking to get an idea about the dish as a whole. Population or Sample

A survey of 500 COC students. The Sample GPA of every student at Crown High School. Population The

height of every fifth person entering a grocery store. Sample Speed Dating You will create two equal lines facing each other. You will have one-minute to discuss and answer the question I tell you to answer I will call time and then call on a

student or two to answer the question and discuss why. Move to the right Repeat Good Research Questions Criteria: The population The variable: What is being measured A numerical characteristic about the population related to the variable.

Lets Practice: What is the average amount of time teachers spend outside of the school grading papers? Teachers What is the population? Amount of What is the is being measured? time spent grading What is the numerical characteristic

about the population related to the variable? The average amount of time spent grading Lets Practice What is the average amount of time spent on social media? What is the population? A population was not identified

What is the is being measured? Time spent on social media What is the numerical characteristic about the population related to the variable? The average amount of time spent on social media Project #1: Three Truths and a Lie You will work on groups of 3 4 students

Your group will be creating 9 good research questions and 3 not very good research questions (dont make it to obvious though) These questions will go into a power point presentation that you will present to the class. Your goal is to get more points then the other teams. Observational Study Vs. Experiment Observational

study: Observes individuals and measures variables of interest. Experiment: Intentionally manipulates one variable in an attempt to cause and effect on another variable. The purpose to create a cause-and-effect relationship. Observational Study or

Experiment Does reducing screen brightness increase battery life in laptop computers? To find out, researchers obtained 30 new laptops of the same brand. They chose 15 of the computers at random and adjusted their screens to the brightest setting. The other 15 laptops screens were left at the default setting-moderate brightness. Researches then measure how long each machines battery lasted. Is this an observational study or experiment? Justify your answer. Observational Study or

Experiment An educator wants to compare the effectiveness of computer software for teaching biology with that of a textbook presentation. She gives a biology pretest to each of a group of high school juniors, then randomly divides them into two groups. One group uses the computer, and the other studies the text. At the end of the year, she tests all students again and compares the increase in biology test scores in the two groups. . Is this an observational study or experiment? Justify your answer.

Observational Study or Experiment One study of cell phones and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same age, gender, and race who did not have brain cancer, then asked about the use of cell phones. Results Our data suggest that the use of handheld cellular phones is not associated with the risk of brain cancer. Is this an observational study or experiment? Justify your answer.

Observational Study or Experiment A study of child care enrolled 1364 infants and followed them through their sixth grade year in school. Later, the researcher published an article in which they stated that the more time children spent in child care from birth to age four-and-a-half, the more adults tended to rate them, both at age four-and-a-half and kindergarten, as less likely to get along with others, as more assertive, as disobedient, and as aggressive. Is this an observational study or experiment? Justify your answer.

Experiment Relationship between two variables Explanatory: The factor you are manipulating Response: The variable we are measuring Explanatory and Response Does reducing screen brightness

increase battery life in laptop computers? To find out, researchers obtained 30 new laptops of the same brand. They chose 15 of the computers at random and adjusted their screens to the brightest setting. The other 15 laptops screens were left at the default setting-moderate brightness. Researches then measure how long each machines battery lasted. Justify your answer. Explanatory and Response An educator wants to compare the effectiveness of computer software for

teaching biology with that of a textbook presentation. She gives a biology pretest to each of a group of high school juniors, then randomly divides them into two groups. One group uses the computer, and the other studies the text. At the end of the year, she tests all students again and compares the increase in biology test scores in the two groups. Justify your answer. Observational Study Provides

evidence of a link between two variables. Confounding variables: Other factors that might influence the results Confounding Variable A study of child care enrolled 1364 infants and followed them through their sixth grade year in school. Later, the researcher published an article in which they stated that the more time children spent in child care from birth to age fourand-a-half, the more adults tended to rate them, both at age four-anda-half and kindergarten, as less

likely to get along with others, as Confounding Variable One study of cell phones and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same age, gender, and race who did not have brain cancer, then asked about the use of cell phones. Results Our data suggest that the use of handheld

cellular phones is not associated with the risk of brain cancer. Exit Ticket What is the difference between a sample and population? What is the difference between an Observational Study and Experiment?

What are the three criteria for a good research question.

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