A company, which makes battery-operated cars, claims that its products have a mean life span of 6 years with standard deviation of 3 years. if a random sample of 40 toy card was tested and found to have a life mean of only 4 years. Test if the sample is a representation of the population at 6% level of significance.

-State the hypothesis - The level of significance, one/two-tailed test, degrees of freedom -statistical test -computation -Decision Rule - Reject Ho or Failed to reject Ho -Conclusion

A coffee shop relocates to Italy and wants to make sure that all lattes are consistent. They believe that each latter has an average of 5 oz of espresso. If this is not the case, they must increase or decrease the amount. They took a random sample of 10 lattes and the following are the ounces of espresso 15, 17, 15, 20, 12, 10, 19, 14, 19, 20

Use alpha = .05

-State the hypothesis - The level of significance, one/two-tailed test, degrees of freedom -statistical test -computation -Decision Rule - Reject Ho or Failed to reject Ho -Conclusion