Question: 1. If students picked numbers completely at random from numbers 1 to 20, the proportion of times that the number 7 would be picked is

1. If students picked numbers completely at random from numbers 1 to 20, the proportion of times that the number 7 would be picked is 0.5. When 15 students picked a number "at random" from 1 to 20, 4 of them picked the number 7. What is the sample proportion equal to?

2. The Central research team wanted to estimate the percentage of adults who have laptops in a large city. Six hundred randomly selected residents in this city are surveyed to determine this estimate. Among the 600 adults sampled, 420 responded that they have laptops. Use a 95% confidence level, compute a confidence interval estimate for the true proportion of adult residents of this city who have laptops.

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The status rule: We tend to have more confidence in information presented by someone who has a relatively high status and rank in society than by someone who hasnt.

The spatial rule: The closer spatial proximity we have to an event, the more importance we will attach to it.

The visual rule: If we observe an event with our own eyes, we will attach more weight to it than if someone else had described it to us.