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Brittney N.

Elementary Statistics a Step by Step Approach

7 months, 2 weeks ago

Hello. Welcome to this lesson. In this lesson we have a random sample of 250 it's called the selected and has found 170 of these a person's cause. So based on that you're finding The proportion the 90% confidence interval for the proportion of those calls that are passing. So here we have Uh confidence level of 90% that's a two sided. So we have a Z score of 1.65 from the table. Now we need a proportion the sample proportion that is called to the number of persons caused all over the toodles called. Okay So here we have 170 on 250 Which is 0.68. And now we need to calculate the lower limits. So lower limits recalculated by subtracting the yes. Hello from the Mhm. Some poor proportion than the upper limit. We add the arrow to the sample proportion. So here the error is equal to does this court times the square roots Of the proportion 1- the proportion all over the sample size. So here the error is so close to one 65 square root of 0.68. Then 1 -0.68. All over 250. Alright so we have the arrow. Mhm So there are 0.05. And now the lower limits the lower limit L L Would be the proportion that is 0.68 -0.05. So the lower limits 0.68 -0.05. And that is 0.63. Now the upper limit we have 0.68 plus 0.05. And now the A parliament would have 0.73. Right? So thanks for the time, this is the end of the lesson.

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