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QUESTION 4 From a population of cans of coffee marked "12 ounces," a sample of 25...

QUESTION 4

  1. From a population of cans of coffee marked "12 ounces," a sample of 25 cans is selected and the contents of each can are weighed. The sample revealed a mean of 11.70 ounces and a sample standard deviation of 0.7 ounces. Test to see if the mean of the population is at least 12 ounces. (Assume the population is normally distributed.) Use a .05 level of significance.

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Answer #2

4)

This is the left tailed test .

The null and alternative hypothesis is

H0 : = 12

Ha : < 12

Test statistic = t

= ( - ) / s / n

= (11.70 - 12) / 0.7 / 25

= -2.143

Test statistic = -2.143

df = 24

P-value = 0.0212

= 0.05

P-value <

Reject the null hypothesis .

answered by: anonymous
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