Student conducts a high temperature experiment using a thermister with a guaranteed accuracy of +/- 1.3 degrees fahrenheit. the student takes an initial set of 11 measurements, and calculates a sample average of 224 and a sample deviation of 19.8 degrees. assuming a confidence level of 99%, estimate the total number of samples needed to ensure a total measurement uncertainty less than 3.5 degrees. (the number of samples should be an integer)

213 samples needed for 99% confidence interval

Step-by-step explanation:

We know that:

minimum size of sample needed to be sure about total measurement less than 3.5 degree is given as

where,

s is standard deviation = 19.8 degree

E IS MARGIN OF ERROR = 3.5 degree

right tail critical value of

Z

so, minimum size of sample needed is

n = 213.02

Therefor 213 samples needed for 99% confidence interval

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116