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morpeh [17]
2 years ago
7

A travel company is investigating whether the average cost of a hotel stay in a certain city has increased over the past year. T

he company recorded the cost of a one-night stay for a Friday night in January of the current year and in the previous year for 31 hotels selected at random. The difference in cost (current year minus previous year) was calculated for each hotel.
Which of the following is the appropriate test for the company’s investigation?

a) A one-sample z-test for a population mean
b) A one-sample t-test for a sample mean
c) A one-sample z-test for a population proportion
d) A matched-pairs t-test for a mean difference
e) A two-sample t-test for a difference between means
Mathematics
1 answer:
Ivan2 years ago
7 0

Answer:

d) A matched-pairs t-test for a mean difference

Step-by-step explanation:

The appropriate test for the company's investigation is a matched-pairs t-test for a mean difference.

A matched-pairs t-test is a test that is used to test if compared datasets have significant mean difference.

In this case, the travel company wants to compare the cost for the month of January of the present year, and the cost for the month of January of the previous year for different hotels selected at random.

The travel company also takes the difference in cost of all samples.

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OlgaM077 [116]

Given:

The inequalities are:

a) w

b) t>-25, t=-24, -25, -25.1, -27

To find:

The solution of inequalities by substituting the given values.

Solution:

a) We have,

w

After substituting the given values one by one, we get

-4.3 False statement.

-5.3 False statement.

-8.3 True statement.

-9 True statement.

Therefore the solutions of w are w=-8.3, -9.

b)

We have,

t>-25, t=-24, -25, -25.1, -27

After substituting the given values one by one, we get

-24>-25 True statement.

-25>-25 False statement.

-25.1>-25 False statement.

-27>-25 False statement.

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3 years ago
A rectangular piece of cardboard is 16y cm long and 23 cm wide. Four square pieces of cardboard whose sides are 6y cm each are c
Anna11 [10]

Answer:

Area of remaining cardboard is 224y^2 cm^2

a + b = 226

Step-by-step explanation:

The complete and correct question is;

A rectangular piece of cardboard is 16y cm long and 23y cm wide. Four square pieces of cardboard whose sides are 6y cm each are cut away from the corners. Find the area of the remaining cardboard. Express your answer in terms of y. If your answer is ay^b, then what is a+b?

Solution;

Mathematically, at any point in time

Area of the cardboard is length * width

Here, area of the total cardboard is 16y * 23y = 368y^2 cm^2

Area of the cuts;

= 4 * (6y)^2 = 4 * 36y^2 = 144y^2

The area of the remaining cardboard will be :

368y^2-144y^2

= 224y^2

Compare this with;

ay^b

a = 224, and b = 2

a + b = 224 + 2 = 226

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DiKsa [7]

That is, log x = k if and only if 10 k = x.

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Help ASAP:Solve : 0.84+91.279
jeka94

Answer:

92.119

Step-by-step explanation:

0.84+91.279=92.119

Hope this helps!

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