HELP ON 6,7,8 QUICK ASAP
1 answer:
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Answer: 32/27
Step-by-step explanation:
x = 8/9
x + 8 /27
Answer:
Clarence should poll 847 to create the confidence interval.
Step-by-step explanation:
We have the following information:
1-α = 0.98
<em>e</em> = 0.04
<em>p</em> = unknown
The value of the sample (<em>n</em>) can be calculated using the following formula:
<u>First step: obtain the value of </u><u><em>p</em></u>
Since we're not given a value of p, we'll have to use the value that maximizes the sample. The value that maximizes the sample is always p = 0.5.
<u>Second step: obtain the value of </u><u><em>z</em></u>
Since the confidence interval is going to be of 98%, you’ll have 1% of the distribution in each tail. Therefore the z values we’re looking for are the cumulative values of the z distribution up to 1% or up to 99%. Either value will work, but you’ll just need to use one of them.
Looking up on any z-table, the value of a 99% area in a z distribution is of z = 2.327.
<u>Third step: replace in the formula</u>
Since we're looking for the number of people that should be polled, we cannot have decimals in the answer. Therefore we round up to 847 students.