Find the equation of the line that
1 answer:
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Answer:
Step-by-step explanation:
This is a normal distribution question with
Mean = 153
Standard Deviation= 10
Since we know that score
a)
P(x > 150.0)=?
The z-score at x = 150.0 is,
This implies that
P(x > 150.0) = P(z > -0.3)
= 1 - P(z < -0.3) = 1 - 0.3820885778110474
P(x > 150) = 0.6179
Answer:
The required sample size increases.
Step-by-step explanation:
The margin of error of a confidence interval is given by:
In which z is related to the confidence level(the higher the confidence level the higher z), is the standard deviation of the population and n is the size of the sample.
In this question:
The confidence level decreases, so z decreases.
For the margin of error to stay the same, the sample size also has to decrease.
The required sample size increases.