You wait outside a grocery store and ask people passing by to be in your sample. You are using
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stratified sampling |
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convenient sampling |
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simple random sampling |
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judgemental sampling |
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systematic random sampling |
convenient sampling.................It is non probability sampling.
Since, in this sampling method we are selecting sample/members of population who are conveniently available.
You wait outside a grocery store and ask people passing by to be in your sample....
Would you agree to the statement on random sampling methods. Please explain why. In probability samples “each population element has a known (non-zero) chance of being chosen for the sample.” (StatTrek 2020). Some examples of probability samples are, simple random sampling, stratified sampling, cluster sampling, multistage sampling, and systematic random sampling. Simple random sampling is the population and sample consists of “N” objects, and an example is when people play the lottery. Stratified sampling is based on some type of...
Put the following sampling situations in the order 1. Cluster 2. Systematic 3. Stratified 4. Simple Random options: A) As the people entered the airport every 8th person was sniffed by the police dog. B) From a large college campus everyone taking a statistics course is selected to complete a survey. C) From each grocery store in the city a the price of three random cans of soup is collected. D) By using current student numbers a select group of...
5. People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of {x} grocery shoppers to further investigate their behavior. Determine the expected value of the sampling distribution, i.e. E(p-bar). Express your answer as a decimal rounded to two decimal places.
People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. Use z-table. Show the sampling distribution of (), the proportion of groceries thrown out by your sample respondents (to 4 decimals). p = standard error of the proportion σ( ) = What is the probability that your survey will...
Jackson's Food Marts marketing director, read from a national grocery magazine that the average wait time at a convenience food mart is 2.5 min. He took a random sample of 20 shoppers at the Jackson's Food Mart. The average wait for the sample shoppers was 2.8 minutes with a standard deviation of 1.5 minutes. He asked you if the average wait time at the Jackson's Food Mart was really less than the national average stated in the magazine or was...
People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March, 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. Round your answers to four decimal places. a. Show the sampling distribution of p, the proportion of groceries thrown out by your sample respondents. 1. Is the distribution normal or abnormal? 2. The Mean is ? What is...
450 people are randomly selected at grocery stores across the state and surveyed on the amount of money they are spending at the store that day. How does finding the sample variance compare to investigating the sampling distribution of the variance? A. The sampling distribution of the variance requires repeating this process with the same sample several times. So this does not compare to the sampling distribution of the variance. B.Only 450 people are selected from all the shoppers, so...
Jackson's Wait Time Trina Appleton, Jackson's Food Marts marketing director, read from a national grocery magazine that the average wait time at a convenience food mart is 2.5 minutes. She took a random sample of 20 shoppers at the Jackson's Food Mart on Overland Road. The average wait for the sample shoppers was 2.8 minutes with a standard deviation of 1.5 minutes. She asked you if the average wait time at the Overland Jackson's was really less than the national...
You are working for Fly-by-Night Research, conducting interviews about a cosmetic brand. The population is people in Wichita between 35 and 45 years old. Since the population of Wichita is approximately 51% female and 49% male, you are told to select 200 people 35-45 years old, 102 females and 98 males. You stand on the street and interview people who look helpful until you have interviewed 98 people who identify as men and 102 who identify as women. What kind...
(1 point) For each problem, select the best response. (a) A simple random sample of size n is defined to be A. a sample of size n chosen in such a way that every unit in the population has the same chance of being selected. B. a sample of size n chosen in such a way that every set of n units in the population has an equal chance to be the sample actually selected. C. a sample of size...