Question 9
0/10 pts 5 4 Details
Part 1 of 4
The average McDonald's restaurant generates $2 million in sales each year with a standard deviation of 0.6.
Emmanuel wants to know if the average sales generated by McDonald's restaurants in Washington is
different than the worldwide average. He surveys 39 restaurants in Washington and finds the following data
(in millions of dollars):
1.9, 2.6, 2.2, 2.5, 1.5, 3.1, 1.5, 2.5, 2.1, 2.5, 1.9, 2.2, 2.5, 2.4, 2.3, 2.4, 1.8, 2, 2.3, 2.5, 2.8, 1.6, 1.6,
2.1, 1, 3.7, 1.7, 1.3, 1.8, 3.1, 2.8, 1.7, 2.6, 0.8, 2.3, 2.7, 2.7, 2.5, 2.5
Perform a hypothesis test using a 6% level of significance.
Step 1: State the null and alternative hypotheses.
$H_0$: ??
$H_a$: ??
(So we will be performing a Select an answer test.)
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Question 10
0/10 pts 5 4 Details
Maintaining your balance may get harder as you grow older. A study was conducted to see how steady the
elderly are on their feet. They had a random sample of subjects stand on a force platform and have them
react to a noise. The force platform then measured how much they swayed forward and backward, and the
data are in the table below. Do the data show that the mean elderly sway measurement is higher than the
mean forward sway of younger people, which is 18.125 mm? Test at the 1% level.
