Problem 13E

A method of applying zinc plating to steel is supposed to produce a coating whose mean thickness is no greater than 7 microns. A quality inspector measures the thickness of 36 coated specimens and tests H0.:µ ≤ 7 versus H1:µ, >7. She obtains a P-value of 0.40. Since P > 0.05, she concludes that the mean thickness is within the specification. Is this conclusion correct? Explain.

OIS 2340 - Business Statistics Week 3 1/23 - Professor Elizabeth Goryunova - University of Utah Chapter 3 In Class Lecture & Notes from the Textbook Histogram: No Gaps #’s Counts numbers upward Sorts by frequency of data, not categories Bar Chart: Gaps Nominal data Order doesn’t matter Scatter Diagram Used to show relationship between 2 quantitative variables Chapter 3 Parameter: a measure from the entire population Statistic: A measure from a sample selected from the population Mode: value that occurs most frequently (the most common outcome) - You can have more than one mode, being a bi-modal distribution Ex. If a restaurant wants to know the most common group size they seat they would collect data like this: Number of People Frequency 1 2 2