A manufacturer of chocolate chips would like to know whether its bag filling machine works correctly at the 411 gram setting. It is believed that the machine is overfilling the bags. A 21 bag sample had a mean of 416 grams with a standard deviation of 14. Assume the population is normally distributed. Is there sufficient evidence at the 0.1 level that the bags are overfilled? Step 2 of 6: Find the value of the test statistic. Round your answer to three decimal places.

Answer:
Given:

The hypothesized mean $(\mu) = 411$
The sample mean $(\overline{x}) = 416$
The sample standard deviation $(s) = 14$
The sample size $(n) = 21$

The significance level $(\alpha) = 0.1$

Solution:
The null and alternative hypothesis:

$H_0: \mu = 411$
$H_a: \mu > 411$

The test statistic $(t):$
$t = \frac{\overline{x} – \mu}{\frac{s}{\sqrt{n}}}$

$= \frac{416 – 411}{\frac{14}{\sqrt{21}}}$

$= 1.637$

The degree of freedom $(df):$
$df = n – 1$
$= 21 – 1$
$= 20$

The p-value:
$\text{The p-value} = P(t > 1.637)$

$= 0.0587$

The final conclusion:

The p-value is less than the significance level. Therefore, there is sufficient evidence to conclude that the bags are overfilled at the 0.1 significance level.

Final Answer:

The null and alternative hypothesis:

$H_0: \mu = 411$
$H_a: \mu > 411$

The test statistic $(t) = 1.637$

The p-value $= 0.0587$

The final conclusion:

The p-value is less than the significance level. Therefore, there is sufficient evidence to conclude that the bags are overfilled at the 0.1 significance level.

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