# 7.png - Questions related to HW[IUMpts 1 You are interested...

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Unformatted text preview: Questions related to HW'?‘ [IUMpts]: 1] You are interested in howr stressed out students are during ﬁnals week. You knowr [magically] that the standard deviation 'sigma’ of all students stress levels is equal to 5 but are interested in learning about the unknown mean mu of all students. So you go out and measure stress levels in 15 students and ﬁnd that your sample mean livbar :15. [a] What distribution is this sample mean drawn from? [Empts] [b] What is critical 3* for 95% conﬁdence? [1—pts] [c] What is the 95% conﬁdence interval? [2—pts] 2] Suppose you did not magically know sigma a] Based on the data you collected what would you use in its place? [iv-p13] b] in doing so, you would no longer be able to use the Z—distribution and instead would have to use the Distribution [Empt] c] What would the new critical value be for 95% conﬁdence? [Empt] ...
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• Spring '14
• CAPLOVITZ,GIDEON
• Standard Deviation, unknown mean mu, howr, sample mean livbar

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