a Duration of seizure b Breast cancer Diagnosed not diagnosed c The length of

A duration of seizure b breast cancer diagnosed not

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a. Duration of seizure ……………………. b. Breast cancer (Diagnosed , not diagnosed)…………………….. c. The length of time that a cancer patient survives after diagnosis…………. Ms. Lubna Ineirat
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Basic probability sampling Random sampling methods: Each member of the population has the same probability of being selected 1. Simple Random Sample (SRS) Each member of the population has the same probability of being selected Use generator of random numbers to get non- repeating random numbers “ 5. 978, 325 ,… Pick case from your sampling frame acorrding to these random numbers. Ms. Lubna Ineirat
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the table of random digits Ms. Lubna Ineirat
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2. Systematic Sampling A systematic sample is obtain by simple selecting every K-th individual from the population to be in the sample 1. Obtain a list of an a available population 2. Pick a number n as step size 3. Pick every n-th subject of the list Ms. Lubna Ineirat
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Ex: population size =1000 ……. Sample size= 200 1) calculate sampling fraction 2) Get one random number between 1 and 5 as a starting point for your selection. 3) After that we pick every 5-th person . Ex : if we pick 2 as a random number Then the sample will be 2,7,12,17,22 ,….. Population sizeo Sam 1 p 0 le 00 siz 5 e 200 Ms. Lubna Ineirat
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3. Stratified sampling - Divide a available population into relevant subgroups called strata - Decide an appropriate sample size for each strata - Collect a proper sample of the desired size from each strata. Ms. Lubna Ineirat
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Example: Population (1500) Sample(300) Single rooms 500 Shared flats 800 Private apartments 200 Ms. Lubna Ineirat
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Example : Identify each of the following as examples of qualitative or quantitative variables: 1. The temperature in Barrow, Alaska at 12:00 pm on any given day .( qualitative or quantitative ) 2. Whether or not a 6 volt lantern battery is defective. ( qualitative or quantitative ) 3. The weight of a lead pencil . ( qualitative or quantitative ) 4. The length of time billed for a long distance telephone call. ( qualitative or quantitative ) 5. The brand of cereal children eat for breakfast ( qualitative or quantitative ) 6. The type of book taken out of the library by an adult. ( qualitative or quantitative ) Ms. Lubna Ineirat
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Example : Identify each of the following as examples of (1) nominal , (2) ordinal , (3) discrete , or (4) continuous variables: 1. The length of time until a pain reliever begins to work…… 2. The number of chocolate chips in a cookie…….. 3. The number of colors used in a statistics textbook……. 4. The brand of refrigerator in a home……… 5. The overall satisfaction rating of a new car……. 6. The number of files on a computer’s hard disk……. 7. The pH level of the water in a swimming pool……. 8. The number of staples in a stapler……… Ms. Lubna Ineirat
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  • Fall '19
  • Ms. Lubna Ineirat

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