The department of economic and community development (decd) reported that in 2009 the average number of new jobs created per county was 450. the department also provided the following information regarding a sample of 5 counties in 2010. assume the population is normally distributed. county new jobs created in 2010 bradley 410 rhea 480 marion 407 grundy 428 sequatchie 400.
a. compute the sample average and the standard deviation for 2010.
b. we want to determine whether there has been a significant decrease in the average number of jobs created. provide the null and the alternative hypotheses.
c. compute the test statistic.
d. at α = 0.05, test the hypotheses.
e. build a 95% confidence interval about the population mean given the sample information above.
f. does the result from the interval support your test conclusion from part (d)? explain.

here is your mark brainliest

step-by-step explanation:

i found the life tables for the year 2012. 

life table of males at age 30. probability of dying between ages x and x+1

total population:  

29–30 . . . . . . . . . . . . 0.001030

30–31 . . . . . . . . . . . . 0.001061

males:  

29–30 . . . . . . . . . . . . 0.001420

30–31 . . . . . . . . . . . . 0.001448

white population

29–30 . . . . . . . . . . . . 0.001005

30–31 . . . . . . . . . . . . 0.001037

white males

29–30 . . . . . . . . . . . . 0.001372

30–31 . . . . . . . . . . . . 0.001399

non hispanic white population

29–30 . . . . . . . . . . . . 0.001083

30–31 . . . . . . . . . . . . 0.001116

non hispanic white males

29–30 . . . . . . . . . . . . 0.001477

30–31 . . . . . . . . . . . . 0.001503

jacob, non hispanic white male. 30 years old.

probability that jacob lives to be 30 years old. 

since the given probabilities are probabilities of dying, i think we simply subtract it from 1 to get the probability of living. we will use the probability of non hispanic white male.

                                          probability of living to be 30 y.o.

29 - 30 : 1 - 0.001477 = 0.998523

30 - 31 : 1 - 0.001503 = 0.998497

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.