Aresearch group wants to determine whether the proportion of car accidents that were caused by drivers using cell phones has changed from the previous value of 13%. they obtained 10,000 auto accident reports and found that 14% were caused by drivers using cell phones. find the test statistic.

-2.88

Step-by-step explanation:

Hypothesis : The proportion of car accidents that were caused by drivers using cell phones has changed from the previous value =13%

i.e. p=0.13

Sample size :

The proportion of auto accident were caused by drivers using cell phones.

Now, the test statistic for the population proportion is given by :-

Hence, the value of the test statistic is -2.88

overpriced

step-by-step explanation:

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.