Question 1. A new laser-enhanced machining process has become...

Question 1. A new laser-enhanced machining process has become available and the developer claims that the production time for a batch of 1000 screws will be less than 10 minutes, which would be an improvement over the current process.  To test the validity of this claim, production time for 100 batches produced by the new process are selected at random and the result will be used to make a decision as to whether or not the manufacturer should invest in the new process. What is the null hypothesis?

Group of answer choices

μ = 10

μ ≤ 10

μ < 10

μ ≥ 10

μ > 10

Question 2. In order to check if blood pressure measurements change if one is sitting or standing, a study was conducted where systolic blood pressure of 35 patients were recorded while in sitting position and then again while standing. The comparison of systolic blood pressure in the two positions is an example of testing the difference between:

Group of answer choices

Two means from independent populations.

Two population proportions.

Matched pairs from two dependent populations.

All of the above options are equally viable testing methods.

Question 3. A financial analyst working for a financial consulting company wishes to find evidence that the average price-to-earnings ratio in the consumer industry is higher than average price-to-earnings ratio in banking industry. The alternative hypothesis is:

Group of answer choices

^μconsumer  -  ^μbanking = 0

^μconsumer - ^μbanking  ≤  0

^μconsumer -  ^μbanking > 0

^μconsumer - ^μbanking  <  0

^μconsumer -  ^μbanking ≠ 0