There are 300 welders employed at maine shipyards corporation. a sample of 30 welders revealed that 18 graduated from a registered welding course. construct the 95 percent confidence interval for the proportion of all welders who graduated from a registered welding course

 (0.4247,0.7753)

Step-by-step explanation:

Given : Sample size : n=30

Number of people graduated from a registered welding course =18

The probability of people graduated from a registered welding course :

Significance level :

Critical value :

A confidence interval for population proportion is given by :-

Hence,  the 95 percent confidence interval for the proportion of all welders who graduated from a registered welding course = (0.4247,0.7753)

part a

in a city ice cream is mostly only bought when the temperature is very high as ice cream cools down our

so we can derive the conclusion that as the temperature increases the number of ice creams sold also increases

part b

y intercept is 5

slope is 2

happy to

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