In a study of 420 comma 142 cell phone users, 136 subjects developed cancer of the brain or nervous system. test the claim of a somewhat common belief that such cancers are affected by cell phone use. that is, test the claim that cell phone users develop cancer of the brain or nervous system at a rate that is different from the rate of 0.0340% for people who do not use cell phones. because this issue has such great importance, use a 0.001 significance level. identify the null hypothesis, alternative hypothesis, test statistic, p-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. use the p-value method and the normal distribution as an approximation to the binomial distribution.

Step-by-step explanation:

n=420142

Users =136

p=0.000324=0.0324%

H0: p =0.000340

Ha: p not equals 0.000340

(Two tailed test at 0.001 level)

p difference = -0.000016

Std error =

=0.00002775

test statistic =-0.576

p value = 0.5646

Since p >0.001, we accept null hypothesis.

i.e. there is no statistical evidence that the proportion differs from 0.0340% significantly.

6,250

step-by-step explanation:

to get the area, multiply 360 by 160.(57,600)

to find out how many bags of fertilizer it will take, first figure out how many square feet one bag can hold. divide 1000 by 8(125) to get the unit rate(how many square feet one pound of fertilizer can hold)and multiply it by 50(6250). if i haven't made a mistake, that is the answer.

answer: on graphs, the open and closed circles, or vertical asymptotes drawn as dashed lines us identify discontinuities.

as before, graphs and tables allow us to estimate at best.

when working with formulas, getting zero in the denominator indicates a point of discontinuity.

when working with piecewise-defined functions, check for discontinuities at the transition points where one piece ends and the next begins.

step-by-step explanation: