In regards to Type Il error, which one is false?

O You must have Type I error given before finding Type I error O a correct decision when the null hypothesis is false. O Type Il error could be smaller, larger, or the same as Type I error. O Not rejecting the Null when the null hypothesis is false.

A Quality control inspector is worried about the alignment of the Lathe machine. Too many products have not been meeting the standard. She collects a sample of 18 items and wants to test the mean weight with a level of significance of 5%. If the test statistics is 1.83, then

O She should assume there are some problerns with the alignment O No decision can be made as we don't know if we have to use the T or the Z table O She should assume everything is in alignment O We need to know the actual Hypothesis

A bar which was opened to serve mainly the middle-age people (average age 50) is verifying if that indeed is true. It plans to survey 20 customers at a level of significance of 10%. It, of course, doesn't know the population standard deviation. The critical vaue of the statistics to be used is