Question 2) Suppose you work for a large cab company that operates in Caiia. You

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Question 2) Suppose you work for a large cab company that operates in Caiia. You are tasked with studying the drivers who work for your company. To do this you first divide your company into its three main service areas, San Francisco, Los Angeles, and San Diego. Then you randomly sample 50 drivers from each location. You take the 150 selected drivers, call each of them, tell them you work for the cab company and then proceed to ask them three questions, "Do you always wear a seatbelt while driving your cab? (Yes/No)", "How many hours do you drive for our company per week?", "How satisfied are you with this job? Very Satisfied, Satisfied, Neutral, or Not Satisfied." Out of the 150 drivers you call only 45 answer your call and give answers to your questions (a) What was the population of interest? (b) What was your sample? (c) What were the individuals in your sample? (d) What type of sampling technique did you use to build your sample? (e) Classify each of the three variables that you studied in this sample as Categorical or Quantita tive. EXTRA CREDIT QUESTION: Look back at Question 2. Suppose that out of the 45 drivers you actually hear back from 43 of them answer your first question with "Yes, I always wear a seatbelt while driving my cab". What percent of your sample is this? Do you think this percentage is an overestimate or underestimate of the real percentage of cab drivers for your company that always wear their seatbelts while driving? Make sure to explain your reasoning.

Explanation / Answer

(a) Population of interest is "all the drivers working under the cab company".

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(b) There are three samples chosen from three main service area namely,San Francisco,Los Angeles,San Diego. One sample of size 50 are chosen from the San Francisco, Second sample of size 50 is chosen from Los Angeles . And the third sampe of size 50 is chosen from San Diego . Total sample soze 50+50+50=150

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(c)

Here individuals of the samples are the drivers.

(d)

I should use SIMPLE RANDOM SAMPLING WITHOUT REPLACEMENT. This technique is used because samples are chosen at random.

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(e)

The first variable "whether wear seatbelt" is answered either by "yes" or by "no"

So this can not be measured or is not countable. Hence is Categorical variable.

The second variable "number of hours of driving per week" is countable variable. Hence is quantitaive variable.

The third variable "Satisfaction level" is uncountable. Hence is categorica variable.

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