# 1.The U.S. Department of Labor reported the average hourly earnings for U.S. production workers… 1 answer below »

1.The U.S. Department of Labor reported the average hourly earnings for U.S. production

workers to be $14.32 per hour in 2001 (The World Almanac, 2003). A sample of 75 production

workers during 2003 showed a sample mean of $14.68 per hour. Assuming the population

standard deviation s $1.45, can we conclude that an increase occurred in the

mean hourly earnings since 2001? Use a .05.

2. For the United States, the mean monthly Internet bill is $32.79 per household (CNBC,

January 18, 2006). A sample of 50 households in a southern state showed a sample mean

of $30.63. Use a population standard deviation of $5.60.

a. Formulate hypotheses for a test to determine whether the sample data support the conclusion

that the mean monthly Internet bill in the southern state is less than the national

mean of $32.79.

b. What is the value of the test statistic?

c. What is the p-value?

d. At a .01, what is your conclusion?