2. Apple's Mac computer batteries last for 7 hours on a single charge with a standard deviation of 20 minutes. A new supplier offers them a battery that they say will have increased battery life. A random sampling of twelve of the new batteries are tested and found to have a sample mean of 7 hours and 22 minutes and a sample standard deviation of 34 minutes. Does this new battery match the company's claim (to 95% confidence)? Perform a hypothesis test, showing all steps.

Q: Evaluate if x=4,8,3,-2 ∑x ∑x+1 ∑(x+1) 3∑x - 4

A: Given that  if x=4,8,3,-2

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A:

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A:

Q: -8 - 12

A: Given problem is

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A: NOTE As you don't mention what to find. I am just simplify the expression.

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A: In this question, we have to explain how we interpret r and r2

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A: We use middle term splitting method/ AC method to simplify denominator

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A: