t-Test: Two-Sample Assuming Unequal Variances Hourly Wages Mean Variance Observations Hypothesized Mean Difference df t Stat P(T<=t) one-tail t Critical one-tail P(T<=t) two-tail t Critical two-tail Females Males 39.58 52.70 721.9756547 1049.186198 17 0 23 -1.18248435 0.124547072 1.713871528 0.249094145 2.06865761 13
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- A researcher wants to measure average cardiovascular health of university students and compare those scores to the average scores in the general population. Assuming that population variance is known, what statistical test is most appropriate for this study? independent-samples t-test single-sample t-test z-test for sample mean related-samples t-testA bank wants to determine whether a customer's preference for using cash or credit can be used to predict whether they will answer the phone on a weekday evening. What would be the most appropriate procedure to use to analyze data to answer this question? Only choose a test that handles multiple comparisons If such a test is needed. Regression Test of Slope or Correlation O Test for a Difference of Proportions O Test for a Difference of Means O Chi-square test of association O ANOVA (Analysis of Variance)ANOVA Involves "decomposition of variance-a fancy term that means we examine diferent sources of variabilty. Name and describe each of the sources of varlability used in an ANOVA and tell me which source of variability we always want to be largest and why.
- A child care center wants to determine if there is a relationship between how long a child naps in minutes (20,21,22,23,24,etc.,etc) and incidents of aggression (1,2,3,4,etc.,etc). What type of statistical test should be used? Group of answer choices Chi Square Independent t-test Dependent t-test ANOVA Correlation AnalysisNintendo Sony would like to test the hypothesis that a difference exists in the average age of users of 3 console games (a Wii, a PlayStation, or an Xbox). The summary of data and the incomplete ANOVA table for testing this hypothesis are given below. SUMMARY Groups Count Sum Average Variance Wii 168 33.6 11.8 PlayStation 120 24 3.5 Xbox 162 32.4 10.3 ANOVA Source of Variation Df MS F P-value F crit Between 273.6 0.000408 3.885294 Groups Within 102.4 8.533333 Groups Total Based on the given information and the incomplete ANOVA table, fill in the following blanks with the correct numbers. The total number of data in this study is (without any decimal places) A and the value of degrees of freedom (df) for between groups is (without any decimal places) and the p value of this test (Кeеp all the decimal places)Which would be the appropriate way to test differences in proportions for more than two samples? t-test if variance is unknown z-test paired t-test F-test for equality of variances cross-tabulation procedure to conduct a chi-square test