A population has a standard deviation x=18.4. How large a sample must be drawn so that a 98% confidence interval will have a margin of error equal to 4.1?

Respuesta :

Answer:

"109" will be the appropriate response.

Step-by-step explanation:

The given values are:

Standard deviation,

[tex]\sigma=18.4[/tex]

Margin of error,

[tex]E = 4.1[/tex]

Using the table,

[tex]Z_{(\frac{0.02}{2} )}=2.326[/tex]

Now,

The sample size will be:

⇒  [tex]n=(\frac{Z_{(\frac{0.02}{2})\times \sigma}}{E} )^2[/tex]

On substituting the values, we get

⇒      [tex]=(\frac{2.326\times 18.4}{4.1} )^2[/tex]

⇒      [tex]=(\frac{42.7984}{4.1} )^2[/tex]

⇒      [tex]=(10.4386341)^2[/tex]

⇒      [tex]=109[/tex]