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worty [1.4K]
3 years ago
14

The mean gpr averages of a random sample of 36 college seniors is calculated to be 2.6. the population standard deviation is 0.3

.
a. find the 95% confidence interval for the mean of the entire senior class.
b. find the 99% confidence interval for the mean of the entire senior class.
c. which confidence interval is wider? why?
Mathematics
1 answer:
Alika [10]3 years ago
8 0
A is the correct answer
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There are 2 variables in this problem. One variable is the class number and other variable is the participation in extracurricular activities. Each variable has further two categories. There are two classes: Class 10 and 11. And students either participate or do not participate in extracurricular activities, which makes 2 categories. 

The best approach to solve this question is to build a table and start entering the given information in it. When the given data has been entered fill the rest on basis of the data you have.

18 students from grade 11 participate in at least one Extracurricular activities. This means the rest students i.e. 22 students from grade 11 do not participate in Extracurricular activities. 

32 students from grade 10 participate in at least one Extracurricular activities. This means total students who participate in at least one Extracurricular activities are 18 + 32 = 50 students.

The rest 50 students do not participate in at least one Extracurricular activities. From these 22 are from class 11. So the rest i.e. 28 are from class 10.

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Answer:

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Step-by-step explanation:

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Which one is the better deal, the 8 inch little zip for $6.25 or the 11 inch big zip for $7.75.
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Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar.
Hatshy [7]

Answer:

The change in the area of the rectangle is 0 square feet

Step-by-step explanation:

To solve this problem we have to calculate the area of ​​the two rectangles that give us

first we have to know the formula to calculate the area of ​​a rectangle

a = area

l = length  = 12ft

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a = l * w

we replace the known walues

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we do the same with the other rectangle, but first we have to calculate its sides

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to calculate the change in the area we subtract (a - a2)

a - a2 =

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