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asambeis [7]
3 years ago
8

Plz help! Is this right? Question is below!

Mathematics
1 answer:
ipn [44]3 years ago
5 0

Answer:

first one im pretty sure

Step-by-step explanation:

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Historically, the mean yield of corn in the United States has been 120 bushels per acre with a standard deviation of 12. A surve
Illusion [34]

Answer:

z=\frac{125-120}{\frac{12}{\sqrt{40}}}=2.64    

P-value

Since is a two sided test the p value would be:  

p_v =2*P(z>2.64)=0.0082  

And the best answer would be

B 0.0082

Step-by-step explanation:

Data given and notation  

\bar X=125 represent the mean height for the sample  

\sigma=12 represent the population standard deviation

n=40 sample size  

\mu_o =120 represent the value that we want to test

\alpha represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is 120 or not, the system of hypothesis would be:  

Null hypothesis:\mu = 120  

Alternative hypothesis:\mu \neq 120  

If we analyze the size for the sample is > 30 and we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}  (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic

We can replace in formula (1) the info given like this:  

z=\frac{125-120}{\frac{12}{\sqrt{40}}}=2.64    

P-value

Since is a two sided test the p value would be:  

p_v =2*P(z>2.64)=0.0082  

And the best answer would be

B 0.0082

4 0
3 years ago
Describe the key aspects of the function f(x) = –x2 – 2x – 1.
amid [387]

Answer:

x-int of -1; y-int of -1; parabola that is reflected along the x-axis.

3 0
3 years ago
One of the tables shows a proportional relationship.
beks73 [17]

Answer:

See attached

Step-by-step explanation:

The graph of a <u>proportional linear relationship</u> is a line that <u>passes through the origin</u> (0, 0).

From inspection of the given tables, the <u>linear equations</u> for each table of points is:

  • Table 1:  y = x + 1
  • Table 2:  y = x/2
  • Table 3:  y = x + 2
  • Table 4:  y = 2x + 1

The only equation for which y = 0 when x = 0 is y = x/2  →  Table 2.

Given points from Table 2:

  • (2, 1)
  • (4, 2)
  • (6, 3)
  • (8, 4)

To <u>graph the line</u>, plot the given points and draw a line through them (see attached).

5 0
2 years ago
A person jogs 4.0 km in 32 minutes then 2.0 km in 22 minutes and finally 1.0 km in 16 minutes what is the joggers average speed
love history [14]
I think 68 km per min.
4 0
3 years ago
Read 2 more answers
PLEASE HELP ME WITH ME MATH In a survey of 3500 people who owned a certain type of​ car, 1750 said they would buy that type of c
Anna [14]

Answer:

50%

Step-by-step explanation:

3500 divided  by 1750 is 2 which is equal to 50%

3 0
2 years ago
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