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Nataliya [291]
3 years ago
14

one morning it was- 9°F in Columbus, Ohio and -7°F in Pittsburgh,Pennsylvania. was it warmer in Columbus or Pittsburgh

Mathematics
2 answers:
Klio2033 [76]3 years ago
7 0
Pittsburgh because -9°F is colder than -7<span>°F</span>
Rama09 [41]3 years ago
5 0
The answer is Pittsburgh.

When temperature is in the negatives, the higher number is warmer and the lower number is colder.

Glad to help!
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The 90% confidence interval is (0.1897, 0.2285).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence interval 1-\alpha, we have the following confidence interval of proportions.

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In which

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For this problem, we have that:

From a July 2019 survey of 1186 randomly selected Americans ages 18-29, it was discovered that 248 of them vaped (used an e-cigarette) in the past week. This means that n = 1186, \pi = \frac{248}{1186} = 0.2091

Construct a 90% confidence interval to estimate the population proportion of Americans age 18-29 who vaped in the past week.

So \alpha = 0.10 , z is the value of Z that has a pvalue of 1 - \frac{0.10}{2} = 0.95, so z = 1.645.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.2091 - 1.645\sqrt{\frac{0.2091*0.7909}{1186}} = 0.1897

The upper limit of this interval is:

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Step-by-step explanation:

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