A random sample of 27 fields of rye has a mean yield of 43.1 bushels per acre and standard deviation of 5.31 bushels per acre. Determine the 80% confidence interval for the true mean yield. Assume the population is approximately normal. Step 2 of 2 : Construct the 80% confidence interval. Round your answer to one decimal place.

The 80% confidence interval = (41.8, 44.4)

Step-by-step explanation:

From the above question, the random number of samples is 27, this sample size is below 30, hence it is small.

To solve for this, we have use t score instead of confidence interval.

Degrees of freedom = 27 - 1 = 26

t score for 80% confidence interval = 1.315

The 80% confidence interval = Mean ± t score × standard deviation/√n

Mean = 43.1 bushels

Standard deviation = 5.31

Hence,

43.1 ± 1.315 × 5.31/√27

43.1 ± 1.3438116191

Hence:

43.1 - 1.3438116191

= 41.756188381

≈ 41.8

43.1 + 1.3438116191

= 44.443811619

Approximately ≈ 44.4

Therefore, the 80% confidence interval = (41.8, 44.4)

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

related questions

its a trick question

step-by-step explanation:

dogs love water, just turn on the hose and it will run in circles chasing the water all day : )