1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
suter [353]
3 years ago
13

Any suggestions or answers

Mathematics
1 answer:
nignag [31]3 years ago
6 0
The answer to the question is d
You might be interested in
What angle relationship describes ∠UQR and ∠WRT?
sashaice [31]

Answer:

corresponding angles because it is in a F pattern shape

always corresponding angle is denoted from F pattern and its sum is always equal

5 0
2 years ago
Read 2 more answers
23. A certain type of gasoline is supposed to have a mean octane rating of at least 90. Suppose measurements are taken on of 5 r
Nostrana [21]

Answer:

a) p_v =P(Z          

b) Since p_v we can reject the null hypothesis at the significance level given. So based on this we can commit type of Error I.

Because Type I error " is the rejection of a true null hypothesis".

c) P(\bar X >90)=1-P(Z

1-P(Z

d) For this case we need a z score that accumulates 0.02 of the area on the right tail and 0.98 on the left tail and this value is z=2.054

And we can use this formula:

2.054=\frac{90-89}{\frac{0.8}{\sqrt{n}}}

And if we solve for n we got:

n = (\frac{2.054 *0.8}{1})^2=2.7 \approx 3

Step-by-step explanation:

Previous concepts  and data given  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

We can calculate the sample mean and deviation with the following formulas:

\bar X = \frac{\sum_{i=1}^n X_i}{n}

s=\sqrt{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}

\bar X=88.96 represent the sample mean    

s=1.011 represent the sample standard deviation  

n=5 represent the sample selected  

\alpha significance level    

State the null and alternative hypotheses.    

We need to conduct a hypothesis in order to check if the mean is less than 90, the system of hypothesis would be:    

Null hypothesis:\mu \geq 90    

Alternative hypothesis:\mu < 90    

If we analyze the size for the sample is < 30 and we don't know the population deviation so is better apply a t 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{88.96-90}{\frac{0.8}{\sqrt{5}}}=-2.907      

Part a

P-value  

First we need to calculate the degrees of freedom given by:

df=n-1=5-1 = 4

Then since is a left tailed test the p value would be:    

p_v =P(Z    

Part b

Since p_v we can reject the null hypothesis at the significance level given. So based on this we can commit type of Error I.

Because Type I error " is the rejection of a true null hypothesis".

Part c

We want this probability:

P(\bar X

The best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}

If we apply this formula to our probability we got this:

P(\bar X >90)=1-P(Z

1-P(Z

Part d

For this case we need a z score that accumulates 0.02 of the area on the right tail and 0.98 on the left tail and this value is z=2.054

And we can use this formula:

2.054=\frac{90-89}{\frac{0.8}{\sqrt{n}}}

And if we solve for n we got:

n = (\frac{2.054 *0.8}{1})^2=2.7 \approx 3

7 0
3 years ago
How do you find the nearest hundredth of a decimal number?
liraira [26]
Round up if the previous digit is 5 or above, leave it the same (only the hundreth digit, erase all the other thousandths and such) if it is 4 or below
5 0
3 years ago
In an experiment, the variable that is manipulated is called the?
melamori03 [73]
Response variable.....
4 0
3 years ago
What is 7/12 ÷ 2/5? Remember KCF method.​
beks73 [17]
7/12 divided by 2/5 is 35/24
6 0
3 years ago
Other questions:
  • The scale of a map is 1 inch to 15 miles. It is about 75 miles between two cities. How many inches should separate the cities on
    14·1 answer
  • What's 63,889 rounded to the nearest hundred
    6·2 answers
  • Ms. Wiltz has a $20 gift certificate to her local bakery. If she buys a loaf of banana nut bread for $8.30 and uses the rest of
    5·1 answer
  • What is the final point of (-2,1) Up 4, right 6 then reflect across the x-axis
    10·1 answer
  • What's the answer for this multiplication problem????
    7·1 answer
  • Question is down below
    6·1 answer
  • Franco is makeing breakfast he uses 36 eggs for 12 orders how many eggs did he use per order
    14·1 answer
  • If B = y + 2 and C Y-7, find an expression that equals B + 2C in<br> standard form.
    13·2 answers
  • HELP IM GIVING 20 POINTS LIKE PLZZ I NEED HELP​
    14·1 answer
  • Keegan says that a quadrilateral is a square if and only if it is a rectangle. Is this a true biconditional statement?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!