Tobias S.

asked • 11/12/22

Help me with this statistics homework please asap

1) A tyre manufacturer claims that more than 85% of the company’s tyres will last at least 80,000km. In a random sample of 400 tyres, 22 wore out before reaching 80,000km. Do the data support the manufacturer’s claim with a=0.01


2) As many consumers are choosing to do their Christmas shopping online, retailers are advertising their competitive delivery times. Suppose you want to advertise your business as offering the fastest delivery time for local deliveries. A random sample of the amount of time it takes your business to 100 deliver packages to local addresses produced a mean of 7 hours and 15 minutes and a standard deviation of 2 hours and 30 minutes. A sample of 80 delivery times from your closest competitor yields an average of 8 hours and 45 minutes and a standard deviation of 3 hours. Is there sufficient evidence to support your advertisement, at the 10% level of significance?


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Gabrielle M. answered • 11/12/22

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Again, I appreciate and commend you for sticking through this entire video to maximize your learning and understanding on how to solve #2 in this request. Let us know if you have any follow-up questions. Peace :)

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Tobias S.

Could you please show through the steps for question 1 but calculate through excel?
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11/13/22

Gabrielle M.

Absolutely. What I'll have to do is create a separate question page for Qt.1 (I'll do a video review of that as well to show you through the steps in Excel) and I'll share the link to that here in this comment thread.
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11/13/22

Gabrielle M.

And there you go! - https://www.wyzant.com/resources/answers/912390/testing-one-sample-proportion-hypothesis-word-problem I apologize about the lengthy time to get this to you - I kept having some sort of technical issue where I had restarted twice (you'll here that bit of frustration in the video in a fleeting manner lol). I hope you find this additional video helpful to your other question here.
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11/13/22

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