An article presents measures of penetration resistance for a certain fine-grained soil. fifteen measurements, expressed as a multiple of a standard quantity, had a mean of 2.64 and a standard deviation of 1.06. find a 95% confidence interval for the mean penetration resistance for this soil. round the answers to three decimal places.

[2.053 , 3.227]

Step-by-step explanation:

The 95% confidence interval is given by the interval

where

= the sample mean  

s = the sample standard deviation  

n  = the sample size

is the 0.05 (5%) upper critical value for the Student's t-distribution with 14 degrees of freedom (sample size -1), which is an approximation to the Normal distribution for small samples (n<30).

Either by using a table or the computer, we find  

and our 95% confidence interval is

let's solve your equation step-by-step.

4x+2=2x+12

step 1: subtract 2x from both sides.

4x+2−2x=2x+12−2x

2x+2=12

step 2: subtract 2 from both sides.

2x+2−2=12−2

2x=10

step 3: divide both sides by 2.

2x

2

=

10

2

x=5

step-by-step explanation:

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant