I need help with both of these questions..

Mathematics

1 answer:

aleksandr82 [10.1K]3 years ago

4 0

Answer:

The Coefficient for the first question is 7

For the Next Question the 55h stands for how many hours Damon has been driving already, and the 125 is how many miles he was driving per hour.

Step-by-step explanation:

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The brand manager for a brand toothpaste must plan a campaign designed to increase brand recognition. He wants to first determin

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We need to find out how many adults must the brand manager survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage.

From the given data we know that our confidence level is 90%. From Standard Normal Table we know that the critical level at 90% confidence level is 1.645. In other words, $Z_{Critical}=1.645$ .

We also know that E=5% or E=0.05

Also, since, $\hat{p}$ is not given, we will assume that $\hat{p}$ =0.5. This is because, the formula that we use will have $\hat{p}(1-\hat{p})$ in the expression and that will be maximum only when $\hat{p}$ =0.5. (For any other value of $\hat{p}$ , we will get a value less than 0.25. For example if, $\hat{p}$ is 0.4, then $1-\hat{p}=0.6$ and thus, $\hat{p}(1-\hat{p})=0.24$ .).