The mean work week for engineers in start-up companies is claimed to be about 60 hours with a standard deviation of 5 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; 5; 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 c. if the claim is correct, what is the probability that a sample mean would be as low as Kara's mean? (Give your answer as a percentage accurate to one decimal place.)
The
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
c. if the claim is correct, what is the probability that a sample mean would be as low as Kara's mean?
(Give your answer as a percentage accurate to one decimal place.)
d. If Kara will accept the 60 hours as the real average so long as there's at least a 10% chance the sample
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