The manufacturer of the colorsmart-5000 television set claims 95 percent of its sets last at least five years without needing a single repair. in order to test this claim, a consumer group randomly selects 420 consumers who have owned a colorsmart-5000 television set for five years. of these 420 consumers, 303 say their colorsmart-5000 television sets did not need a repair, whereas 117 say their colorsmart-5000 television sets did need at least one repair. (a) find a 99 percent confidence interval for the proportion of all colorsmart-5000 television sets that have lasted at least five years without needing a single repair.

(0.665 , 0.777)

Step-by-step explanation:

Given : Sample size of consumers: n=420  ;

Number of consumers say their ColorSmart-5000 television sets did not need a repair=303

The the sample proportion for consumers say their ColorSmart-5000 television sets did not need a repair :

Significance level :

Critical value =

The confidence interval for population proportion is given by :_

i.e.  

Hence,  a 99 percent confidence interval for the proportion of all ColorSmart-5000 television sets that have lasted at least five years without needing a single repair = (0.665 , 0.777)

answer: there are 453.592 grams in a pound.

step-by-step explanation:

the true ones are a b and d