The mean work week for engineers in start-up companies is claimed to be about 59 hours with a standard deviation of 6 hours. Kara, a newly hired engineer hopes that it's not (she wants it to be...

The mean work week for engineers in start-up companies is claimed to be about 59 hours with a standard deviation of 6 hours. Kara, a newly hired engineer hopes that it's not (she wants it to be shorter). She asks 10 engineers in start-ups for the lengths of their mean work weeks. Their responses are 70; 45; 55; 60; 65; 55; 55; 60; 50; 55.


a. Is the newly hired engineer testing a mean or a proportion?

b. The null hypothesis (or company claim), in symbols, is μ=μ=Correct.






c. If the claim is correct, what is the probability that a sample mean would be as low as Kara's mean?


Incorrect %


Give your answer as a percentage accurate to one decimal place.