Sources of Error Associated with Sampling

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فهرست عناوین اصلی در این پاورپوینت

● Sampling
● Introduction
● Quiz – Question 1
● Introduction
● Quiz – Question 2
● Introduction
● Quiz – Question 3
● Introduction
● Focal Research
● Sources of Error Associated with Sampling
● Stop and Think
● Sources of Error Associated with Sampling
● Types of Probability Sampling
● Quiz – Question 4
● Types of Nonprobabilty Sampling
● Types of Nonprobability Sampling
● Choosing a Sampling Technique
● Summary

نوع زبان: انگلیسی حجم: 2.04 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 52 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/06/05 11:50:14

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

sample, sampling, error, population, introduction, probability, ., draw, number, source, frame, associate,

توجه: این مطلب در تاریخ 2019/06/05 11:50:14 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://www.sjsu.edu/people/kathrine.richardson/courses/geog135/s1/135-Ch5.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: sample, sampling, error, population, introduction, probability, ., draw, number, source, frame, associate,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

sampling chapter ۵ introduction sampling the process of drawing a number of individual cases from a larger population a way to learn about a larger population by obtaining information from a subset of a larger population example presidential polls are based upon samples of the population that might vote in an election introduction why sample to learn something about a large group without having to study every member of that group time and cost studying every single instance of a thing is impractical or too expensive example census introduction why sample improve data quality obtain in depth information about each subject rather than superficial data on all introduction why sample we want to minimize the number of things we examine or maximize the quality of our examination of those things we do examine. introduction why sample when is sampling unnecessary the number of things we want to sample is small data is easily accessible data quality is unaffected by the number of things we look at example you are interested in the relationship between team batting average and winning percentage of major league baseball teams there are only ۳ major league teams data on team batting averages and winning percentages are readily available introduction why sample elements a kind of thing the researcher wants to look at quiz – question ۱ suppose you are interested in describing the nationality of nobel prize winning scientists. what would an element in your study be what would the population be introduction why sample population the group of elements from which a researcher samples and to which she or he might like to generalize quiz – question ۲ in the case of presidential elections in the united states the population is and the elements of this population are . introduction why sample sample a number of individual cases drawn from a larger population introduction sampling frames probability versus nonprobability samples target population a population of theoretical interest introduction sampling frames probability versus nonprobability samples sampling frame or study population the group of elements from which a sample is actually selected quiz – question ۳ the local television station conducted a study of tv viewers in the local viewing region. a list of all residential customers who subscribed to cable tv was obtained from the cable company. the list had ۲ households as subscribers. the tv station samples every ۴ th household on the subscriber list. an interviewer visited each household and conducted the survey on viewing habits of household members. what is the sampling frame of the study introduction sampling frames probability versus nonprobability samples nonprobability samples a sample that has been drawn in a way that doesn’t give every member of the population a known chance of being selected introduction sampling frames probability versus nonprobability samples probability a sample drawn in a way to give every member of the population a known nonzero chance of inclusion probability samples are usually more representative than nonprobability samples of the populations from which they are drawn introduction sampling frames probability versus nonprobability samples biased samples a sample that is not representative from the population which it is drawn probability samples are less likely to be biased samples introduction sampling frames probability versus nonprobability samples generalizability the ability to apply the results of a study to groups or situations beyond those actually studied a probability sample tends to be more generalizable because it increases the chances that samples are representative of the populations from which they are drawn. introduction stop and think can you think why researchers haven’t used cell phone numbers in polling until recently what problem may result from only using landline numbers focal research calling cell phones in ’ ۸ pre election polls examines the hypothesis than barack obama fared better in probability samples including landline and cell phone users than in samples including landline users alone. focal research thinking about ethics because of the sampling technique employed the pew pollsters never knew the identity of their respondents so respondent anonymity was never in danger. moreover participation in the survey was voluntary. sources of error associated with sampling types of survey error – due to sampling coverage error nonresponse error sampling error sources of error associated with sampling coverage errors errors that results from differences between the sampling frame and the target population sources of error associated with sampling coverage errors people are typically left out if samples are drawn from phone books car registrations etc… unlisted phone numbers – one of the greatest potentials for coverage error pollsters use random digit dial to avoid unlisted numbers random digit dialing a method for selecting participants in a telephone survey that involves randomly generating telephone numbers what are potential future problems with using telephone listings to draw a sample sources of error associated with sampling coverage errors parameter a summary of a variable characteristic in a population sources of error associated with sampling coverage errors statistic a summary of a variable in a sample sources of error associated with sampling nonresponse error errors that result from differences between nonreponders and responders to a survey stop and think what kinds of people might not be home to pick up the phone in the early evening when most survey organizations make their calls what kinds of people might refuse to respond to telephone polls even if they were contacted sources of error associated with sampling sampling error any difference between the characteristics of a sample and the characteristics of the population from which the sample is drawn sources of error associated with sampling sampling error sampling variability the variability in sample statistics that occurs when different samples are drawn from the same population sources of error associated with sampling margin of error suggestion of how far away the actual population parameter is likely to be from the statistic types of probability sampling simple random sampling systematic sampling stratified sampling cluster sampling multistage sampling types of probability sampling simple …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: sample, sampling, error, population, introduction, probability, ., draw, number, source, frame, associate,

این فایل پاورپوینت شامل 52 اسلاید و به زبان انگلیسی و حجم آن 2.04 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/06/05 11:50:14 استخراج شده است.

http://www.sjsu.edu/people/kathrine.richardson/courses/geog135/s1/135-Ch5.ppt

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