Laura’s cell phone service costs $65 per month, plus an additional $0.10 per text message sent. the table below shows the cost for zach’s cell phone service based on the number of texts messages he sends. how much cheaper is zach’s cell phone service than laura’s when no text messages are sent?

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)