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Varvara68 [4.7K]
3 years ago
5

Perform the indicated operation.

Mathematics
1 answer:
Tasya [4]3 years ago
5 0

Answer:

-22

Step-by-step explanation:

-18 - 4 =

We are subtracting both number so add them and then give them a negative sign

-( 18+4)

-22

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Answer:

t-distribution should be used to construct a confidence interval.

Step-by-step explanation:

We are given that a random sample of 18 families, the average weekly food expense was $95.60 with a sample standard deviation of $22.50.

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<em><u>Since in this question we are provided with;</u></em>

Sample average weekly food expense, \bar X = $95.60

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The distribution that we will use here to construct a confidence interval will be <u>t-distribution</u> because in the question we don't know anything about population standard deviation (\sigma) .

Normal distribution is used when we know population standard deviation (\sigma).

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