Answer:
Scale factor = 1.5
Step-by-step explanation:
Formula for the scale factor,
Scale factor =
In this question, image is triangle Y and preimage is triangle X.
Scale factor of X to Y =
= 1.5
Therefore, scale factor = 1.5 is the answer.
How do you write 0.045 as a reduced fraction
2 answers:
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Answer:
A sample size of 385 is needed.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
That is z with a pvalue of , so Z = 1.96.
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
You feel that a reasonable estimate of the standard deviation is 10.0 hours.
This means that
What sample size is needed so that the expected margin of error of your estimate is not larger than one hour for 95% confidence?
A sample size of n is needed. n is found when M = 1. So
Rounding up:
A sample size of 385 is needed.