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nlexa [21]
3 years ago
14

I am struggling can i get some help?

Mathematics
1 answer:
Tems11 [23]3 years ago
5 0
Yes! what’s your question?
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A simple random sample of 100 8th graders at a large suburban middle school indicated that 81% of them are involved with some ty
Sophie [7]

Answer:

The  interval is  0.7187  < p < 2.421

Step-by-step explanation:

From the question we are told that

      The  sample size is  n  = 100

       The  population  proportion is p  =  0.81

       The  confidence level is  C =  98%

The level of significance is mathematically evaluated as

     \alpha  =  100 -98

    \alpha  =  2%%

    \alpha  =  0.02

Here this level of significance represented the left and the right tail

The degree of  freedom is evaluated as

     df =  n-1

substituting value  

    df =  100 - 1

     df = 99

Since we require the critical value of one tail in order to evaluate the  98% confidence interval that estimates the proportion of them that are involved in an after school activity. we will divide the level of significance by 2

The  critical value of  \frac{\alpha}{2} and the evaluated degree of freedom is  

      t_{df , \alpha } =  t_{99 , \frac{0.02}{2}  }  = 2.33

this is obtained from the critical value table  

The standard error is mathematically evaluated as

             SE =  \sqrt{\frac{p(1-p )}{n} }  

substituting value  

           SE =  \sqrt{\frac{0.81(1-0.81 )}{100} }  

           SE = 0.0392  

The 98%  confidence interval is evaluated as

      p  - t_{df ,  \frac{\alpha }{2} } *  SE  < p <  p  + t_{df ,  \frac{\alpha }{2} }

substituting value  

     0.81  - 2.33  *  0.0392  < p <  0.81  +2.33 *  0.0392

      0.7187  < p < 2.421

     

4 0
3 years ago
You were billed $28.50 for additional data usage on your cell phone at a rate of $9 per gigabyte. Three choices are correct ways
Zepler [3.9K]

Answer:

b.) 9/g = 28.5

Step-by-step explanation:

a.) 9g = 28.5

b.) 9/g = 28.5

c.) 28.5 = 9 x g

d.) 28.5/9 = g

Total billing = $28.50

Rate = $9 per gigabyte

Calculate the additional gigabytes, g, that you used.

Additional gigabyte used, g = Total billing / Rate

g = $28.50 / $9

9g = 28.50

28.50 = 9 × g

g = 28.50 / 9

Option b.) 9/g = 28.5 is the incorrect way to calculate the additional gigabytes, g, that you used.

4 0
3 years ago
What is the probability of drawing a yellow marble out of a bag twice in a row if there are eight other marbles in the bag, maki
BabaBlast [244]
Idek but i hope you find your answer lo
5 0
3 years ago
A relation that is symmetric with respect to the x-axis CANNOT be a function,
motikmotik
A function cannot have symmetry with respect to the x-axis
6 0
3 years ago
Read 2 more answers
PLZ I NEED THIS ASAP!!! ILL GIVE YOU BRAINLIST!!!!
dusya [7]

Answer:

x and y do not have a proportional relationship. The constant would be 1.7

Step-by-step explanation:

The reason for this is because as the miles increase they are not following a straight pattern. While 14+14=28 and 28+14=42, 42+14 doesn't equal 70. Even if you think about it in a sense of multiplication, while 14x2=28, 28x2 does not equal 42. What should be done is that the opposite factor of each number should be added together and divided by 3. So 28/14=2, 42/28=1.5, and 70/42=1.6. Then you should take the numbers 2, 1.5, and 1.6, add them together and divide by 3. The answer that you should recieve is 1.7.

Hope that helped.

5 0
3 years ago
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