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Aloiza [94]
3 years ago
8

The problem for my last question. Plz answer!

Mathematics
1 answer:
Svetlanka [38]3 years ago
4 0

Answer:

Find the difference between 4.5 and 40 which is 35.5 then divided that by 100 since you want the percent and that equals 0.35 which is 35%

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Answer:

Under 99% confidence level we can say that mean speed of the new chips is greater than that of the old chips

Step-by-step explanation:

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to calculate the z-statistic we can use the formula:

z=\frac{M_{n}-M_{o}}{\sqrt{\frac{s_{n}^2}{N_{n}} +\frac{s_{o}^2}{N_{o}} } }

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z=\frac{495.6-481.2}{\sqrt{\frac{19.4^2}{65}} +\frac{14.3^2}{65} } } =4.8171

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A survey was taken on pet ownership. 750 people were covered on the first day of the survey. The number tripled every subsequent
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