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Oduvanchick [21]
2 years ago
9

A bank account pays 4.2% interest.write an equation with an intial value 2000.how much will the account have in it after 5 years

Mathematics
1 answer:
GarryVolchara [31]2 years ago
5 0

Answer:

ruh

Step-by-step explanation:

dasdadad

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kupik [55]
The unit rate would probably be 21 per 3.5
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The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random samples of sizes
devlian [24]

Answer:

(a) There is no evidence to support the claim that the two machines produce rods with different mean diameters.

P-value is 0.818

(b) 95% confidence interval for the difference in mean rod diameter is (-0.17, 0.27).

This interval shows that the difference in mean is between -0.17 and 0.27.

Step-by-step explanation:

(a) Null hypothesis: The two machines produce rods with the same mean diameter.

Alternate hypothesis: The two machines produce rods with different mean diameter.

Machine 1

mean = 8.73

variance = 0.35

n1 = 15

Machine 2

mean = 8.68

variance = 0.4

n2 = 17

pooled variance = [(15-1)0.35 + (17-1)0.4] ÷ (15+17-2) = 11.3 ÷ 30 = 0.38

Test statistic (t) = (8.73 - 8.68) ÷ sqrt[0.38(1/15 + 1/17)] = 0.05 ÷ 0.218 = 0.23

degree of freedom = n1+n2-2 = 15+17-2 = 30

Significance level = 0.05 = 5%

Critical values corresponding to 30 degrees of freedom and 5% significance level are -2.042 and 2.042.

Conclusion:

Fail to reject the null hypothesis because the test statistic 0.23 falls within the region bounded by the critical values -2.042 and 2.042.

There is no evidence to support the claim that the two machines produce rods with different mean diameters.

Cumulative area of test statistic is 0.5910

The test is a two-tailed test.

P-value = 2(1 - 0.5910) = 2×0.409 = 0.818

(b) Difference in mean = 8.73 - 8.68 = 0.05

pooled sd = sqrt(pooled variance) = sqrt(0.38) = 0.62

Critical value (t) = 2.042

E = t×pooled sd/√n1+n2 = 2.042×0.62/√15+17 = 0.22

Lower limit of difference in mean = 0.05 - 0.22 = -0.17

Upper limit of difference in mean = 0.05 + 0.22 = 0.27

95% confidence interval for the difference in mean rod diameter is between a lower limit of -0.17 and an upper limit of 0.27.

3 0
3 years ago
The 25 member of the reading club are buying a book to discuss at the next meeting the club leader got a special price the book
Pavel [41]

8.14 times 25 = 203.5

5 0
3 years ago
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Solve the equation 3(x+1)+2x=1/2(10x-14) <br>Plz show the steps
Umnica [9.8K]

Answer:

x=-2

Step-by-step explanation

1) Remove () and Rewrite

  • 13x+13+2x=1/2x2(5x-7)

2) Collect Like Terms

  • 15x+13=5x-7

3) Move Terms

  • 15x-5x=-7-13

4) Divide Both Sides

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ANSWER IS x=-2

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HELP ASAP ILL GIVE BRAINLIST
tankabanditka [31]

Answer: I think the answer would be (2, -1)

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3 years ago
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