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3 years ago

Can someone pls help me with this question?

Mathematics

2 answers:

Licemer1 [7]3 years ago

6 0

Answer:

<u><em>D. The bank balance in John's saving account increases from Month 4-5</em></u>

Step-by-step explanation:

Lets go with one answer at a time

It talks about the fact that there is not change from Month 1 to Month 2

However, an entire $750 has changed therefore, option A would be incorrect.

This one also talks about the fact that there is no change from Month 2 to Month 3

When in fact it has changed more than $250 downwards, so option B would be incorrect.

This one talks about the bank account decreasing from Month 3 to 4

However, in that time period it stays the same therefore, option C would also be incorrect.

Now that should mean that D is the right answer, but, we should still check.

This talks about John's bank account increasing from Month 4-5

Yes it does change upwards. It increases $750 again.

Therefore, your answer would be D. The bank balance in John's saving account increases from Month 4 to 5.

Ilya [14]3 years ago

5 0

Answer:

Step-by-step explanation:

the slope from month 4 to month 5 is positive so the money in his account is rising

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To test the belief that sons are taller than their fathers, a student randomly selects 13 fathers who have adult male children.

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1) B. The differences are normally distributed or the sample size is large

C. The sample size mus be large

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2) The null hypothesis H₀: $\bar x_1$ = $\bar x_2$

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Step-by-step explanation:

1) B. The differences are normally distributed or the sample size is large

C. The sample size mus be large

E. The sampling method results in an independent sample

2) The null hypothesis H₀: $\bar x_1$ = $\bar x_2$

The alternative hypothesis Hₐ: $\bar x_1$ < $\bar x_2$

The test statistic for t test is;

$t=\dfrac{(\bar{x}_1-\bar{x}_2)}{\sqrt{\dfrac{s_{1}^{2} }{n_{1}}-\dfrac{s _{2}^{2}}{n_{2}}}}$

The mean

Height of Father, h₁, Height of Son h₂

72.4, 77.5

70.6, 74.1

73.1, 75.6

69.9, 71.7

69.4, 70.5

69.4, 69.9

68.1, 68.2

68.9, 68.2

70.5, 69.3

69.4, 67.7

69.5, 67

67.2, 63.7

70.4, 65.5

$\bar x_1$ = 69.6

s₁ = 1.58

$\bar x_2$ = 69.9

s₂ = 3.97

n₁ = 13

n₂ = 13

$t=\dfrac{(69.908-69.915)}{\sqrt{\dfrac{3.97^{2}}{13}-\dfrac{1.58^{2} }{13}}}$

(We reversed the values in the square root of the denominator therefore, the sign reversal)

t = -0.00693

p- value = 0.498 by graphing calculator function

P-value > α Therefore, we do not reject the null hypothesis

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