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about a mean using the critical value method 4 7 points Example Hypothesis Test Critical...

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about a mean using the critical value method 4 7 points Example Hypothesis Test Critical Value A computer software vendor claims that a new version of their operating system will crash less than seven times per year on average A system administrator installs the operating system on a random sample of 41 computers At the end of a year the sample mean number of crashes is 8 1 with a standard deviation of 3 9 Can you conclude that the vendor s claim is false Use the a 0 05 significance level Degrees of Freedom Hints Area in the Right Tail 0 10 0 05 0 025 39 1 304 40 1 303 50 1 299 1 685 1 684 1 676 2 023 2 021 2 009 In Calculator to find t Use STAT Tests Ttest Stats HO X S X n o o o Calculate If t ta we reject Ho If t ta we don t reject Ho 4 points Describe the relationship between hypothesis tests and confidence intervals through an example

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