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lys-0071 [83]
3 years ago
10

PLEASE HELPPP !!! I WILL GIVE BRIGHTEst !!!​

Mathematics
1 answer:
djyliett [7]3 years ago
4 0

Answer :

here

13) 4

14) 3

15) 10

16) 8

17) 8

18) 2

19) 9

20) 9

Step-by-step explanation:

Hope this helps

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The mean age when smokers first start is 13 years old with a population standard deviation of 2 years. A researcher thinks that
lakkis [162]

Answer:

Null hypothesis:\mu = 13  

Alternative hypothesis:\mu \neq 13

z=\frac{12.2-13}{\frac{2}{\sqrt{30}}}=-2.191  

a. Reject the null hypothesis

c. There is enough evidence to support the claim

Step-by-step explanation:

Data given and notation  

\bar X=12/2 represent the sample mean  

s=20000 represent the standard deviation for the sample  

\sigma =2 represent the population standard deviation

n=30 sample size  

\mu_o =13 represent the value that we want to test  

\alpha=0.05 represent the significance level for the hypothesis test.  

z 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 to be tested  

We need to conduct a hypothesis in order to determine if the smoking age has significantly changed since the invention of ENDS—electronic nicotine delivery systems, the system of hypothesis would be:  

Null hypothesis:\mu = 13  

Alternative hypothesis:\mu \neq 13

Compute the test statistic

We know the population deviation, so for this case 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".  

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

z=\frac{12.2-13}{\frac{2}{\sqrt{30}}}=-2.191  

What do you conclude? Using the p-value approach  

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

p_v =2*P(Z  

Since the p_v then the correct decision is:

a. Reject the null hypothesis

And the best conclusion is :

c. There is enough evidence to support the claim

6 0
3 years ago
Please help me I really need these to be answered. Whoever does it gets 100 points!
VladimirAG [237]

Answer 1:

x=2 and y=2

Answer 2:

No solutions.

5 0
3 years ago
Read 2 more answers
Help please quick 29 points please answer
melomori [17]

Answer:

Step-by-step explanation:

It costs $7 for 1 baseball and Mrs.Weeks is buying 36 baseballs, that would be: $7 X 36 = $252

It costs $5 for 1 softball and Mrs.Weeks is buying 24 softballs that would be:

$5 X 24 = $120

$252 + $120 = $372 for the baseballs and softballs

Mrs.Weeks gives the cashier four $100 bills that is $400 dollars.

so $400 - $372 = $28 (Mrs.Weeks change)

5 0
3 years ago
Anna has 7 baskets and some flowers. she has 5 fewer baskets than flowers. how many flowers does anna have
MrRa [10]

Answer:

2 flowers

Step-by-step explanation:

if she has 7 baskets and 5 fewer baskets than flowers

you get the equation 7-5 which is 2

8 0
3 years ago
A bicycle tire has a diameter of 62 cm.
MrRa [10]

Answer:

1947.78 inches or 162.31 feet.

Step-by-step explanation:

the circumference of any given circle is its diameter times pi. So, if you multiply the diameter times pi and then the circumference by 10 you get the number of inches traveled, if you divide that by 12 you get the number of feet traveled.

5 0
3 years ago
Read 2 more answers
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