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Many successful restaurants allow servers to sample each item in the menu — free of charge — in order to develop a feel for what they are selling.
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In random sampling, each item or element of the population has an equal chance of being selected at each draw.
The entire showroom contains only one display sample of each item; the rest is kept in the stockroom boxed up, minimising overheads and price; H&M will be in direct competition with Ikea.
Table 2 shows the observed percentage of the sample endorsing each item (listed from easy to endorse to hard to endorse) as well as the theoretical probabilities of item endorsement for raw score 5 and raw score 11.
Data are given as mean ± standard devision (SD) of the results from three or four different samples in each item of the experiment.
Ten samples were drawn with replacement for each sample size for each item for the two instruments.
Sample sizes for each item vary from 61 to 63. Fifty-five guides (87% of the total) answered the question, "What is your favorite thing to talk about when giving a tour?" Most answers were single-word responses (e.g., "geology") or short phrases (e.g., "island culture"), but some were several-sentence responses.
The interview guideline includes instructions for a structured assessment and sample questions for each item.
Accordingly, sample size for each item varied as noted in the tables.
Since not all parts of the questionnaire were completed, the specific sample sizes for each item are presented in the tables.
In order to evaluate sampling adequacy to perform a satisfactory factor analysis, the Kaiser-Meyer-Olkin (KMO) [ 35] measure of sampling adequacy for each item was examined using the anti-image of the correlation matrix, to determine whether all the measures of sampling were above the acceptable level of 0.5 [ 36].
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com