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natta225 [31]
3 years ago
12

Researchers for a company that manufactures batteries want to test the hypothesis that the mean battery life of their new batter

y is greater than the known mean battery life of their older version. The researchers selected random samples of 32 of the new batteries, subjected the batteries to continuous use, and determined the mean and standard deviation of the battery lives in the sample. Which of the following is an appropriate test for the researchers' hypothesis?
a. A one-sample z-test for a population mean.
b. A one-sample t-test for a population mean.
c. A one-sample z-test for a population proportion.
d. A matched-pairs t-test for a mean difference
e. A two-sample t-test for a difference between means
Mathematics
1 answer:
guapka [62]3 years ago
8 0

(b) one-sample t-test for a population mean

ur welcome :D

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What's the GCF of 40 and 48
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40|2
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GCF(40,48)=2^3=8
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If m(nx2-y)/z = 5n , find the value of n when m = 6, x = -2, y = -3 and z = -5​
Mila [183]

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-(18/49)=n or approximately n=-0.367

Step-by-step explanation:

our equation is: m(nx²-y)/z=5n in order to find n we need to substitute the values given in the question. when we substitute we get:

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24n+18/-5=5n (we multiply both sides by (-5))

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18=-49n (divide both sides by (-49))

-(18/49)=n or approximately n=-0.367

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