The "Windows Killer" virus is a computer virus that sometimes affects Mac computers.
Among different countries, the distribution of the number of Mac machines with the
virus has an unknown mean $\mu$ and standard deviation $\sigma$. In the general population, the
mean number of machines with the virus is 7,362 and the distribution is approximately
normal. It is believed that infected Mac computers, on average, have less numbers of
infected machines. A random sample of 10 countries has a mean number of infected
Mac computers of 6,565 and a sample standard deviation of 1,891. Conduct the
hypothesis test at the 10% significance level.
Round all final answers to 3 decimal places where appropriate.
(a) State the null and alternative hypotheses, and identify which one is the claim.
$H_0$: Select an answer
$H_1$: Select an answer
Which one is the claim:
$H_0$
$H_1$
For parts (b), (c) use the correct sign for critical value and test statistic.
(b) What is the critical value that you will use in your decision?
(c) What is the test statistic?
(d) Is the null hypothesis rejected?
Yes
No
(e) Is the claim supported?
No, there is not sufficient evidence to conclude that Mac computers must, on
average, have less infected machines.
Yes, there is sufficient evidence to conclude that Mac computers must, on average,
have less infected machines.
