In trying to determine whether air pollution causes reduction in children's lung health a researcher proposes to see if the lung volume of 10-year-old boys who live in high ozone pollution is significantly less than the lung volume of all 10-year-old boys. The mean volume for all 10-year-old boys is 2.05 liters. A random sample of 26 10-year-old boys who live in a community with high levels of ozone pollution is found to have a mean volume of 1.98 liters, with a sample standard deviation of 0.3 liters. Test the researcher's claim that the mean lung volume of 10 -year-old boys who live in a community with high levels of ozone pollution is less than 2.05 at the 5% significance level.

Respuesta :

Answer:

The test statistic will be "-2.33". A further explanation is provided below.

Step-by-step explanation:

According to the question,

[tex]H_0: \mu = 2.05[/tex]

[tex]H_0: \mu < 2.05[/tex]

Given:

[tex]\bar x = 1.98[/tex]

[tex]s = 0.3[/tex]

[tex]n = 100[/tex]

The test statistics will be:

⇒ [tex]t_0 = \frac{\bar x - \mu_0}{\frac{s}{\sqrt{n} } }[/tex]

       [tex]=\frac{1.98-2.05}{\frac{0.3}{\sqrt{100} } }[/tex]

       [tex]=-2.33[/tex]

and the P-value will be:

= [tex]0.011< \alpha[/tex]