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1 answer:
Answer:
15th term of the sequence is 36
Step-by-step explanation:
Given in the question,
a₁ = First term = -20
d = common difference = 4
Expression for the nth term of an arithmetic sequence is,
Here, n = number or term
We have to calculate 15th term of the sequence,
= -20 + 56
= 36
Therefore, 15th term of the sequence is 36.
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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.