A one‐question survey is to be distributed to a random sample of 1500 adults in...

E

Emily

New member
...Ohio....? A one‐question survey is to be distributed to a random sample of
1500 adults in Ohio. The question asks if they support an increase in
the state sales tax. Suppose that 40% of all adults in Ohio support
the increase. Let pˆ denote the proportion of adults in the sample
who say they support the increase.
a. What is the mean and standard deviation of the sampling
distribution of pˆ ?
b. What is the probability that pˆ will be more than 50%? (Hint:
use normal approximation)

Please explain your answers in detail! Thanks so much!!!
 
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