Assignment 1

# Systematic sampling strategy is being used because a

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Systematic sampling strategy is being used because a unit is being taken at regular intervals throughout the population, with a random starting point (40 th customer). Potential biases that might result include response bias because people could tailor their responses to please the interviewer, or there could be slanted question wording. 2) Fuel economy a. The statistic that you have calculated is 8.1 litres (per 100 kilometres). b. The parameter you’re trying to estimate is your car’s gas mileage. c. Your results may be biased because there may be a bad sampling frame. You are always sampling after you fill-up, and maybe you drive your car in extreme conditions for the first 100km, but not other times. d. When Consumer Reports checks your car to predict its fuel economy, the parameter it is trying to estimate could be the average gas mileage for cars, or the maximum (or best) car for gas mileage.

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Question 3 – Department Store (from the text: Chapter 4, page 81, # 34) a) Marginal Distribution Age Shopping Frequency Under 30 30-49 50 and Over Total Low 27 37 31 20% Moderate 48 91 93 49% High 23 51 73 31% Total 21% 38% 42% 100% b) Conditional Distribution Age Shopping Frequency Under 30 30-49 50 and Over Total Low 28% 21% 16% 20% Moderate 49% 51% 47% 49% High 23% 28% 37% 31% Total 100% 100% 100% 100% c) d) It appears that the older you get, the less likely you are to shop with low frequency. No matter the age, for all age groups, everyone seems to shop moderately frequently. But the older you get, the more likely you are to shop with high frequency. These observations demonstrate a relationship between age and shopping frequency. e) This study shows that customers age 50 and over are more likely to shop very frequently. Therefore, there is a greater chance that these customers will shop more at this department store. However, it does not necessarily guarantee that these customers will definitely shop at this store – only that it is more likely. Question 4 – Delivery Service (from the text: Chapter 4, page 83, # 42) a) Pack Rats Boxes R Us On time 94.4% 94.0% Late 5.6% 6.0% Total 500 500 b) Overall, Boxes R Us had a higher percentage of late deliveries. c) Pack Rats Boxes R Us On time Late On time Late Regular 97% 3% 98% 2% Overnight 84% 16% 93% 7%
I do not agree that Pack Rats delivers on time more often. As you can see from the chart

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