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?

 

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