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Amanda [17]
3 years ago
13

Write the null and alternative hypotheses for the following example. Determine if the example is a case of a two-tailed, a left-

tailed, or a right-tailed test.
(a) To test if the mean time a customer has to wait on the phone to speak to a representative of a mailorder company about unsatisfactory service is more than 12 minutes.
(b) To test whether or not a bank's ATM is out of service for an average of more than 10 hours per month
(c) To test if the mean credit card debt of college seniors is less than $100
(d) To test if the mean time a customer has to wait on the phone to speak to a representative of a mail-order company about unsatisfactory service is more than 12 minutes
Mathematics
1 answer:
Molodets [167]3 years ago
4 0

Answer:

Kindly check explanation

Step-by-step explanation:

(a)

H0 : μ = 12

H1 : μ > 12

This is a right tailed test ; the alternative hypothesis has a greater than sign, difference between sample and population mean value will be positive.

(b)

H0 : μ = 10

H1 : μ > 10

This is a right tailed test ; the alternative hypothesis has a greater than sign, difference between sample and population mean value will be positive.

(c)

H0 : μ = 100

H1 : μ < 100

This is a left tailed test ; the alternative hypothesis has a less than sign, difference between sample and population mean value will be negative.

(d)

H0 : μ = 12

H1 : μ > 12

This is a right tailed test ; the alternative hypothesis has a greater than sign, difference between sample and population mean value will be positive.

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Setler [38]

Answer: 0.0136

Step-by-step explanation:

Given : Mean : \mu=25

Standard deviation : \sigma=3.2

Sample size : n=50

The formula to calculate the z-score :-

z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}

For x = 24

z=\dfrac{24-25}{\dfrac{3.2}{\sqrt{50}}}=-2.21

The p-value = P(z\leq-2.21)= 0.0135526\approx0.0136

Hence, the probability that the sample mean age for 50 randomly selected women to marry is at most 24 years = 0.0136

3 0
3 years ago
in how many ways cvan 5 people be chosen and arranged in a straight line, if there are 6 people to choose from'
9966 [12]

Answer:

<h3>720 different ways</h3>

Step-by-step explanation:

Permutation has to do with arrangement. If r objevt selected from n pool of objects are to be arranged in a straight line, this can be done in nPr number of ways.

nPr = n!/(n-r)!

If 5 people are to be chosen and arranged in a straight line, if there are 6 people to choose from, this can be done in  6P5 numbe of ways.

6P5 = 6!/(6-5)!

6P5 = 6!/1!

6P5 = 6*5*4*3*2*1

6P5  = 720 different ways

8 0
3 years ago
A right rectangle prism has a length of 5 cm a width of 4 cm and a height of 3 cm the dimensions of the prism are doubled what i
IRISSAK [1]

Answer: 376 cm^2

Step-by-step explanation:

First you would double all the dimensions:

l = 5 cm x 2 = 10 cm

w = 4 cm x 2 = 8 cm

h = 3 cm x 2 = 6 cm

The formula for finding the surface area of a rectangular prism is A=2(wl+hl+hw)

Substitute the values:

A=2(8*10+6*10+6*8)

Solve using PEMDAS:

A=2(80+60+48)

A=2(188)

A=376

Surface area is always in units^2:

376 cm^2

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Marrrta [24]

y > -3x + 1

This answer is certified correct because I took the quiz

Brainliest is always appreciated

And give me a thanks too ❤

5 0
3 years ago
What is the least common multiple of 20 and 52
Drupady [299]
The LCM of 20 and 52 is 260
hope this helps:)
6 0
3 years ago
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