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Hello.
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So we have a sample size of 16 and from that our mean is 31 standard divisions 8.
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We want to find the 95 % confidence in the world for the population main.
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So here our sample size is very small.
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16 so we're going to use the t table or the student's t distribution.
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So let's see how we're going to set this up.
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So we're going to have x bar plus or minus the critical value of t times this term.
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Division divided by square root of n.
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So here this is a sample standard division.
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Now, how do we get a critical value of t? so we find that using two things.
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The first thing is alpha, which is one minus confidence interval.
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That's one minus point nine five.
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You get point zero five.
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At alpha over two, you have 0 .05...