3 years ago

Can someone help me pls

Mathematics

1 answer:

jok3333 [9.3K]3 years ago

8 0

The value of X=28 while the value of y=28,hopefully this is right

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What expressions are equivalent to 4x-5

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Step-by-step explanation:

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(Small sample confidence intervals for a population mean) suppose you are taking a sampling of 15 measurements. you find that x=

Luda [366]

Answer:

The 99% confidence interval is $71.67 < \mu < 78.33$

Step-by-step explanation:

From the question we are told that

The sample size is $n = 15$

The sample mean is $\= x = 75$

The standard deviation is $s = 5$

Given that confidence is 99% then the level of significance is mathematically represented as

$\alpha = 100 - 99$

$\alpha = 1\%$

$\alpha = 0.01$

Next we obtain the critical values of $\frac{ \alpha }{2}$ from the normal distribution table

The value is

$Z_{\frac{ \alpha }{2} } = 2.58$

Generally the margin for error is mathematically represented as

$E = Z_{\frac{ \alpha }{2} } * \frac{ s}{ \sqrt{n} }$

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=> $75 - 3.3307 < \mu$

=> $71.67 < \mu < 78.33$

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3 years ago