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aev [14]
3 years ago
8

Find the value of y.

Mathematics
1 answer:
Ksivusya [100]3 years ago
7 0

Answer:

y = 2

Step-by-step explanation:

20y - 21 = 10y - 1

20y = 10y + 20

10y = 20

y = 2

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It has been hypothesized that the standard deviation of the germination time of radish seeds is 8 days. The standard deviation o
Yanka [14]

Answer:

\chi^2 =\frac{60-1}{64} 36 =33.19

The degrees of freedom are:

df= n-1= 60-1= 59

And the p value would be given by:

p_v =2*P(\chi^2 >33.19)=0.0053

Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true deviation is different from 8 days.

Step-by-step explanation:

Data given

n=60 represent the sample size

\alpha=0.01 represent the confidence level  

s^2 =6^2 =36 represent the sample variance obtained

\sigma^2_0 =8^=64 represent the value that we want to test

Hypothesis to test

We want to verify if the true deviation is equal to 8 days o not, so the system of hypothesis would be:

Null Hypothesis: \sigma^2 = 64

Alternative hypothesis: \sigma^2 \neq 64

The statistic is given by:

\chi^2 =\frac{n-1}{\sigma^2_0} s^2

Replacing we got:

\chi^2 =\frac{60-1}{64} 36 =33.19

The degrees of freedom are:

df= n-1= 60-1= 59

And the p value would be given by:

p_v =2*P(\chi^2 >33.19)=0.0053

Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true deviation is different from 8 days.

6 0
4 years ago
ABC is translated 6 units up and 3 units left to create ∆A'B'C'.
aivan3 [116]
B is the right answer for  this 

6 0
4 years ago
Can an Isosceles be a(n)<br> A.Equilateral<br> B.Scalene<br> C.Right
gizmo_the_mogwai [7]
An Isosceles can be scalene or right depending on it shape and size
7 0
3 years ago
Read 2 more answers
You find a certain stock that had returns of 8 percent, −3 percent, 12 percent, and 17 percent for four of the last five years.
Tatiana [17]

Answer:

Standard deviation = 8.27 percent

Step-by-step explanation:

Average = (Σx)/N

The average is the sum of variables divided by the number of variables.

x = each variable

N = number of variables = 5

Let the unknown percent be y

6 = (8 - 3 + 12 + 17 + y)/5

y = 30 - 34 = - 4

The standard deviation is the square root of variance. And variance is an average of the squared deviations from the mean.

Mathematically,

Standard deviation = σ = √[Σ(x - xbar)²/N]

x = each variable

xbar = mean = 6 percent

N = number of variables

σ = √[{(8 - 6)² + (-3 - 6)² + (12 - 6)² + (17 - 6)² + (-4 - 6)²}]/(5)]

σ = √[[(2)² + (-9)² + (6)² + (11)² + (-10)²]/(5)]

σ = √[(4 + 81 + 36 + 121 + 100)/(5)] = √(342/5) = 8.27 percent.

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4 years ago
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You earn $30,000 per year, and the federal tax rate is 10 percent. Your net income is
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The correct answer is C.
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