Describe a real-world situation that can be represented by a linear relationship?

1 answer:

5 0

Every few days, on my way home from work, I pull into Ahmad's
Friendly Fuel and fill up my car's gas tank.

His price has been $2.29 per gallon for almost 4 years now, and it still is.

I don't always buy the same amount of gas, but no matter how much I buy,
my cost always fits the linear equation ...

Cost = (2.29) · (number of gallons) dollars.

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The authors of a paper describe an experiment to evaluate the effect of using a cell phone on reaction time. Subjects were asked

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Answer:

a) The 99% confidence interval would be given by (24.409;24.979)

b) n=464

Step-by-step explanation:

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Part a

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=47-1=46$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,46)".And we see that $t_{\alpha/2}=2.01$