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qwelly [4]
3 years ago
8

A cell phone company offers two plans to its subscribers. At the time new subscribers sign up, they are asked to provide some de

mographic information. The mean yearly income for a sample of 39 subscribers to Plan A is $55,575 with a standard deviation of $8,970. For a sample of 29 subscribers to Plan B, the mean income is $59,475 with a standard deviation of $6,942.
At the .025 significance level, is it reasonable to conclude the mean income of those selecting Plan B is larger? Hint: For the calculations, assume the Plan A as the first sample.
The test statistic is ______. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
The decision is _______
the null hypothesis that the mean of Plan B is larger.
The p-value is ______
(Round your answer to 2 decimal places.)
Mathematics
1 answer:
slavikrds [6]3 years ago
3 0

Answer:HI

Step-by-step explanation:HI

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RoseWind [281]

Answers:

  1. Volume
  2. Surface area

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Explanation:

The volume is the amount of stuff that a container can hold on the inside, while the surface area is the amount of stuff that goes on the outside of the container (eg: the amount of paint or wallpaper). In the case of wallpapering a room, we're actually doing the inner walls rather than the outside walls; however, it's the same concept. The surface area only deals with the surface and we want to find out how much area we have to cover. That way we can know how much wallpaper to buy. For problem 1, he needs to know the volume so he can find out how much trash each can would be able to hold. The greater the volume, the larger the bin. For instance a small wastebasket would have a small volume compared to a large waist high heavy duty trash container.

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3 years ago
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Can someone help me please
Dahasolnce [82]

Answer:

a)160

b)300

Step-by-step explanation:

4 0
3 years ago
Just carpet has eight different quality grades of carpeting. Three types are being selected for a corporate test on durability.
zhannawk [14.2K]

Answer:

When we have a set of N elements, the number of combinations of K elements (such that N ≤ K) from these N elements is:

C(N, K) = \frac{N!}{(N - K)!*K!}

Then if we have 8 different types of carpet, and we want to see how many different samples of 3 types we can choose, we just need to replace N by 8, and K by 3 in the above equation:

C(8, 3) = \frac{8!}{(8 - 3)!*3!} = \frac{8!}{5!*3!} = \frac{8*7*6}{3*2} = 56

So there are 56 different samples.

Now we can do the same, but this time we want to use 5 types of carpet, then we will have K = 5.

C(8, 5) = \frac{8!}{(8 - 5)!*5!} = \frac{8!}{3!*5!}  = 56

Again, we have 56 different samples.

7 0
3 years ago
Help me please I’m stuck
Anna35 [415]

Answer:

103

Step-by-step explanation:

There is 540 degrees total in a pentagon. To find the missing angle, you must subtract all the known angles from 540. 540-100-117-105-115=103

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Delvig [45]
4 just count how many are there that are between 19-21
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4 years ago
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