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Degger [83]
3 years ago
14

Are used car was purchased for 7,800 one year later it was worth 6,400 what is the percentage depreciation

Mathematics
1 answer:
sashaice [31]3 years ago
7 0

Answer:

Step-by-step explanatio 16%

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PLEASE HELP ME I BEG I WILL GIVE BRAINLIEST
ohaa [14]

Answer:

Mean = (2.2 + 2.4 + 2.5 + 2.5 + 2.6 + 2.7)/6 = 2.48

Standard deviation = √(summation(x - mean)²/n

n = 6

Summation(x - mean)² = (2.2 - 2.48)^2 + (2.4 - 2.48)^2 + (2.5 - 2.48)^2 + (2.5 - 2.48)^2 + (2.6 - 2.48)^2 + (2.7 - 2.48)^2 = 0.1484

Standard deviation = √(0.1484/6

s = 0.16

Standard error = s/√n = 0.16/√6 = 0.065

Part B

Confidence interval is written as sample mean ± margin of error

Margin of error = z × s/√n

Since sample size is small and population standard deviation is unknown, z for 98% confidence level would be the t score from the student t distribution table. Degree of freedom = n - 1 = 6 - 1 = 5

Therefore, z = 3.365

Margin of error = 3.365 × 0.16/√6 = 0.22

Confidence interval is 2.48 ± 0.22

Part C

We would set up the hypothesis test. This is a test of a single population mean since we are dealing with mean

For the null hypothesis,

H0: µ = 2.3

For the alternative hypothesis,

H1: µ > 2.3

This is a right tailed test

Since the number of samples is small and no population standard deviation is given, the distribution is a student's t.

Since n = 6

Degrees of freedom, df = n - 1 = 6 - 1 = 5

t = (x - µ)/(s/√n)

Where

x = sample mean = 2.48

µ = population mean = 2.3

s = samples standard deviation = 0.16

t = (2.48 - 2.3)/(0.16/√6) = 2.76

We would determine the p value using the t test calculator. It becomes

p = 0.02

Assuming significance level, alpha = 0.05.

Since alpha, 0.05 > than the p value, 0.02, then we would reject the null hypothesis. Therefore, At a 5% level of significance, the sample data showed significant evidence that the mean absolute refractory period for all mice when subjected to the same treatment increased.

Step-by-step explanation:

7 0
3 years ago
Write an equation in point slope form for a line that passes through (2,3) (1,5)
telo118 [61]

Answer:

y = -2x + 7

Step-by-step explanation:

P.S: I solved it twice to show you that it doesn't matter which point you choose, you will get the same result.

But it is important when you calculate the slope

If you have any questions about the way I solved it, don't hesitate to ask me in the comments below ÷)

5 0
3 years ago
Solve 1/2x−5=10−3/4x . Check your solution.<br><br> x=___
dem82 [27]
X= 12


Please let me know if I need to explain it
5 0
2 years ago
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prisoha [69]
Less than 1 I think I'm not sure but I did the math
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3 years ago
Please help!<br> Find the value of x for which ABCD must be a parallelogram.
igor_vitrenko [27]

Answer:

x=5

Step-by-step explanation:

5x-8=2x+7

5x-2x=7+8

3x=15

X=15/3

x=5

5 0
2 years ago
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