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s344n2d4d5 [400]

3 years ago

7

(25 points) A weather reporter in your area said that the speed of sound in air today is about one thousand one hundred feet per

second. What is that speed in scientific notation?

2 answers:

My name is Ann [436]3 years ago

7 0

Answer:

1.1 × 103 feet per second

Rashid [163]3 years ago

6 0

1 thousand and 1 hundred means 1100.

In scientific notation, it's 1.1*10^3

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sergij07 [2.7K]

Answer:

a) sample size is 40

Step-by-step explanation:

(a)

$\sigma=4$ minutes

Margin of error, E is 75 seconds E=75/60= 1.25 minutes.

The level of significance $\alpha= 0.05$ for 95% level of significance

For 95% confidence interval $z_{\frac{\alpha}{2}}=1.96$ from standard deviation table

Sample size required, n

$n=\left (\frac{z_{\frac{\alpha}{2}}\cdot \sigma}{E} \right )^{2}=\left (\frac{1.96\cdot4}{75/60} \right )^{2}=39.337984$

Rounding off, n=40

Sample size =40

Keywords:

95% confidence, sample size, Wall Street Journal

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3 years ago

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DanielleElmas [232]

Answer:

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Step-by-step explanation:

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