Let x represent the number of work hours per week, where the mean is 40 and standard deviation is 10

Question

~~Compute the probability that a random person works more than 65 hours a week?

(b)If twenty people are selected at random, what is the probability that their average work hours are greater than 65 hours per week?

(c)What is the key difference between these two questions?

 

(2)What are the conditions for us to treat the sampling distribution of p-hat as normal?

(3)If I increase the confidence interval, what does that do to the margin of error?

(4)If the sample size of a confidence interval decreases, what does that do to the margin of error?

Answer 1

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