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Anarel [89]
3 years ago
7

Joe has a savings account and a credit card. He has $422 saved in his savings account and has purchased $484 worth of merchandis

e on his credit card. Use positive and negative numbers to explain the sitiuation. Is Joe's overall balance represented by a positive or negative number? Justify your answer.
Mathematics
2 answers:
Sedbober [7]3 years ago
7 0
Because Joe only has $422 on his credit card, his account with be overdrawn by $62. which means, Joe's account will go into the negative balance until he's able to pay the bank back the $62.
valentina_108 [34]3 years ago
6 0
Joe has +$422 in his savings account and credit card. she then purchased something that was 484 which caused joe to go bankrupt and he jumped from +$422 to -$62.
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At the null hypothesis, it is <u>tested if the mean length of jail time is still of 2.5 years</u>, that is:

H_0: \mu = 2.5

At the alternative hypothesis, it is <u>tested if it has increased</u>, that is:

H_1: \mu > 2.5

We have the <u>standard deviation for the population</u>, thus, the z-distribution is used. The test statistic is given by:

z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}

The parameters are:

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  • \mu is the value tested at the null hypothesis.
  • \sigma is the standard deviation of the sample.
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For this problem, the values of the <u>parameters</u> are: \overline{x} = 3, \mu = 2.5, \sigma = 1.5, n = 26

Hence, the value of the <u>test statistic</u> is:

z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{3 - 2.5}{\frac{1.5}{\sqrt{26}}}

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A similar problem is given at brainly.com/question/24166849

5 0
2 years ago
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