Reference no: EM132465262

The national mean (u) absentee rate of workers working for the Old Mill Store Company is reported as. 8,25 days per year. The mean rate (Xbar) for a sample of 14 workers at your old mill store franchise is 7.53 days per year with a standard deviation (s) of 2.72 days.

• State an appropriate null hypothesis
• What is the value of the calculated test statistic (t)?
• Identify the critical value. (setting the level of significance at .05)
• State your conclusion.

A recent news report asserts that the weekly mean number (μ) of drinks (both mixed drinks and beer) consumed by college students is 12.56 drinks. Data from a sample of 30 students enrolled at your university indicate a weekly consumption level (Xbar) of 11.21 drinks, with a standard deviation (s) of 3.88. Assume that you're working at the .05 level of significance.

• State an appropriate null hypothesis
• What is the value of the calculated test statistic (t)?
• Identify the critical value.
• State your conclusion.

Graduating seniors in high schools have an average (u) reading comprehension score of 72.55 with a standard deviation (o) of 12.62. An instructor in a GED program wants to compare his students with other students. Selecting a random sample of 70 student, the same reading comprehensive test results show a sample mean (x) of 79.53. Assume that he set .05 level of significance

• State an appropriate null hypothesis
• What is the value of the calculated test statistic (Z)?
• State your conclusion