Testing_for_Means 9.1-9.5

# 24 314 questions a find a 95 ci for the positive

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Unformatted text preview: Intervals and Hypothesis Testing for Population Hypothesis Testing for Population Means Hypothesis Testing for One Population Mean Comparing Two Means for Two Independent Populations Comparing Two Means for Two Dependent Populations Summary of t-test Conﬁdence Intervals and Hypothesis Testing for Population Hypothesis Testing for Population Means Hypothesis Testing for One Population Mean Comparing Two Means for Two Independent Populations Comparing Two Means for Two Dependent Populations Example 1 (by hand) Data are given in summaried format: measures of a manual agility for men and women Male Female n 65 65 Mean 19.31 18.24 SD 2.24 3.14 Questions A. Find a 95% CI for the positive diﬀerence in the means for the two groups B. What does this interval suggest about gender-based diﬀerence in manual agility? Conﬁdence Intervals and Hypothesis Testing for Population Hypothesis Testing for Population Means Hypothesis Testing for One Population Mean Comparing Two Means for Two Independent Populations Comparing Two Means for Two Dependent Populations Example 1 (cont’d) 2 2 σ1 = σ2 A. 95% CI ¯ ¯ 1 Y1 − Y2 = 1.07 2 3 ∗ df =? ====> tdf = ¯ ¯ SE (Y1 − Y2 ) = 2 2 s1 s2 += n1 n2 = 0.4784 4 ∗ ¯ ¯ Y1 − Y2 ± tdf 2 2 s1 s2 + = n1 n2 = (0.12, 2.02) B. Does the interval contain zero? Based on the interval above we are 95% conﬁdent in our conclusion that the mean score for males is between and higher than the Conﬁdence Intervals and Hypothesis Testing for Population mean score for females. Hypothesis Testing for Population Means Hypothesis Testing for One Population Mean Comparing Two Means for Two Independent Populations Comparing Two Means for Two Dependent Populations Comparing Means for Two Dependent or Correlated Samples (Paired Samples) Conﬁdence Intervals and Hypothesis Testing for Population Hypothesis Testing for Population Means Hypothesis Testing for One Population Mean Comparing Two Means for Two Independent Populations Comparing Two Means for Two Dependent Populations Objectives Upon com...
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## This test prep was uploaded on 03/12/2014 for the course STATS 10 taught by Professor Ioudina during the Spring '08 term at UCLA.

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