What is the ratio a:b if 8a=3b?

A computer manufacturer estimates that its cheapest screens will last less than 2.8 years. A random sample of 61 of these screen

masya89 [10]

Answer:

The test is left - tailed

We cannot reject the organization's claim ( its cheapest screens will truly last less than 2.8 years)

Step-by-step explanation:

Sample size, n = 61

Sample mean, $\bar{X} = 2.4$

Standard deviation, $\sigma = 0.88$

Significance level, α=0.02

Null hypothesis, $H_{o} : \mu = 2.8$

Alternative hypothesis, $H_{a} : \mu < 2.8$

It is clearly seen from the alternative hypothesis, that it is a left tailed test. It is not tailed towards the two directions.

Calculate the test statistic:

$Z = \frac{\bar{X} - \mu}{\sigma/\sqrt{n} } \\Z = \frac{2.4 - 2.8}{0.88/\sqrt{61} }\\Z = - 3.55$

Calculate the P-value:

P(Z < -3.35) = 0.0002

Since (p-value = 0.0002) < (α=0.02), the null hypothesis is rejected.

It can therefore be concluded that the mean of the cheapest screen is less than 2.8 years. i.e. the cheapest screen will last less than 2.8 years

6 0

3 years ago

Read 2 more answers

A watering can dispenses water at a rate of 0.15 gallon per minute. The original volume of water in the can was 5 gallons. Which

Yakvenalex [24]

The 1st value is the time, and the 2nd value is the volume remaining in the can. the can is full at time x = 0 so y = 6.0 1 minute later x = 1 so y = 6.0 - 0.25 and for every 1 unit increase in x, y decreases by 0.25

8 0

4 years ago

PLEASE HELPPP!!! THANK YOU SOO MUCH ILY!!!!!!!

MissTica

Answer:

1) Variables = 11a , 4a

Constants = 0

Coefficients = 11 , 4

2) Variables = 3x , 7x

Constants = 6 , -4

Coefficients = 3 , 7 , 6 , -4

3) Variables = -12m , +4m

Constants = -3 , 16

Coefficients = -12 , 4 , -3 , 16

4) Variables = 6k , k

Constants = -4 , -2

Coefficients = 6 , 1 , -4 , -2

5) Variables = -5p , -2p

Constants = 3 , 13

Coefficients = -5 , -2 , 3 , 13

6) Variables = -10r , -r , -6r

Constants = 11

Coefficients = -10 , -1 , -6 , 11

7) Variables = -5n

Constants = 19 , -8 , 14

Coefficients = -5 , 19 , -8 , 14

8) Variables = 13y , -2y

Constants = 18 , -5

Coefficients = 13 , -2 , 18 , -5

9) Variables = 8a , 3a , -7b , -2b

Constants = 1

Coefficients = 8 , 3 , -7 , -2 , 1

10) Variables = 11x , 2x , -4y

Constants = 8

Coefficients = 11 , 2 , -4 , 8

Step-by-step explanation:

8 0

3 years ago

Any math geniuses? Please respond to this question. Thank you!

valina [46]

Answer:

yes what is the question

Step-by-step explanation:

Any math geniuses? Please respond to this question. Thank you!

5 0

3 years ago

Read 2 more answers

I need help with the problem

Marizza181 [45]

The length is 15 metres,the width is 9 m,and the area is 135 m

Hope this will help u..

4 0

4 years ago