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Statistic Hypothesis Question
mparing methods forp the method with the least variability. It has taken a...
Consider the following hypothesis test. H0: 1 - 2≤ 0 Ha: 1 - 2> 0 The following results are for...
Consider the following hypothesis test. H0: 1 - 2≤ 0 Ha: 1 - 2> 0 The following results are for two independent samples taken from the two populations. Sample 1 Sample 2 n 1 = 30 n 2 = 60 x 1 = 25.6 x 2 = 22.2 σ 1 = 5.2 σ 2 = 6 a. What is the value of the test statistic (round to 2 decimals)? b. What is the p-value (round to 4 decimals)? Use z-table. Use z-value rounded to...
Hypothesis Testing Method A = ADKAR Framework (column A) Method B = Prosci Change Management Methodology...
Hypothesis Testing Method A = ADKAR Framework (column A) Method B = Prosci Change Management Methodology (column B) Null hypothesis is H0: Method A = Method B Research (Alternative) hypothesis is H1:Method A < Method B Sample size: 30 One-tailed test: Direction stated in the hypothesis is determine more effective (greater or less than). Level of Significance (a): .05 t-test is used because standard deviation of population is unknown, sample size is less than 30 Cutoff Sample Score (critical value)...
1) 2) The time delay is measured for a city street. Variability in this value is...
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The time delay is measured for a city street. Variability in this value is estimated as = 0.3 (for time in minutes) by experience. Traffic signs and lights were recently altered to facilitate traffic and reduce delays. Delay times in minutes for a random car sample before and after the rearrangement are shown below. Before 7.5 7.0 7.1 7.3 7.7 7.0 6.8 6.6 7.0 7.3 7.5 7.2 After 6.5 6.6 5.3 6.4 7.0 5.7 6.0 5.9 5.8 6.1...
Background Information: Null Hypothesis Significance Testing (NHST) has long been the workhorse of the scientific method....
Background Information: Null Hypothesis Significance Testing (NHST) has long been the workhorse of the scientific method. The procedure, familiar to us from Modules 7-9, is Assume a null hypothesis Calculate a test statistic If the test-statistic reaches the designated significance level (alpha), reject the null hypothesis, usually in favor of the theory you propose Despite its ubiquity, the procedure has received a fair amount of criticism. Some of these critiques are: We often already know the null hypothesis is unlikely...
Expedia would like to test the hypothesis that the average roundtrip airfare between Philadelphia and Paris...
Expedia would like to test the hypothesis that the average roundtrip airfare between Philadelphia and Paris is higher for a flight originating in Philadelphia when compared to a flight originating in Paris. The following data summarizes the sample statistics for roundtrip flights originating in both cities. Assume that the population variances are equal. Originating City Philadelphia Paris Sample mean $1,240 $1,060 Sample size 15 19 Sample standard deviation $270 $240 1. If Population 1 is defined as flights originating in...
A university is examining four methods to supplement instruction. The methods have been analyzed in four...
A university is examining four methods to supplement instruction. The methods have been analyzed in four separate studies, one for each method. In each study, the final exam scores of a control group of students who didn't receive any supplemental instruction were compared to those of a group who received the particular method of supplemental instruction. A one-tailed, independent samplest test (with the assumption of equal variances) was performed in each study to see if the mean for the supplemental...
Consider the following hypothesis test. Họ: A 1 - 1 2 = 0 Ha: M1-M 2...
Consider the following hypothesis test. Họ: A 1 - 1 2 = 0 Ha: M1-M 2 > 0 The following results are for two independent samples taken from the two populations. Sample 1 Sample 2 ni = 30 n 2 = 50 X 1 = 25.2 x 2 = 22.3 01 = 5.3 0 2 = 7 a. What is the value of the test statistic (round to 2 decimals)? 2.09 b. What is the p-value (round to 4 decimals)?...
Test the following claim. Identify the null hypothesis, alternative hypothesis, test statistic, critical value(s), conclusion about...
Test the following claim. Identify the null hypothesis, alternative hypothesis, test statistic, critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim. A manual states that in order to be a hit, a song must be no longer than three minutes and thirty seconds (or 210 seconds). A simple random sample of 50 current hit songs results in a mean length of 252.5 sec. Assume the population standard deviation of song lengths is 53.5 sec....
Consider the following summary statistics, calculated from two independent random samples taken from normally distributed populations....
Consider the following summary statistics, calculated from two independent random samples taken from normally distributed populations. Sample 1 Sample 2 x¯1=20.92 x¯2=26.80 s21=2.89 s22=3.81 n1=19 n2=15 Test the null hypothesis H0:μ1=μ2against the alternative hypothesis HA:μ1<μ2. a) Calculate the test statistic for the Welch Approximate t procedure. Round your response to at least 3 decimal places. b) The Welch-Satterthwaite approximation to the degrees of freedom is given by df = 27.983055. Using this information, determine the range in which the p-value...
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The time delay is measured for a city street. Variability in this value is estimated as = 0.3 (for time in minutes) by experience. Traffic signs and lights were recently altered to facilitate traffic and reduce delays. Delay times in minutes for a random car sample before and after the rearrangement are shown below. Before 7.5 7.0 7.1 7.3 7.7 7.0 6.8 6.6 7.0 7.3 7.5 7.2 After 6.5 6.6 5.3 6.4 7.0 5.7 6.0 5.9 5.8 6.1...
A university is examining four methods to supplement instruction. The methods have been analyzed in four separate studies, one for each method. In each study, the final exam scores of a control group of students who didn't receive any supplemental instruction were compared to those of a group who received the particular method of supplemental instruction. A one-tailed, independent samplest test (with the assumption of equal variances) was performed in each study to see if the mean for the supplemental...
Consider the following hypothesis test. Họ: A 1 - 1 2 = 0 Ha: M1-M 2 > 0 The following results are for two independent samples taken from the two populations. Sample 1 Sample 2 ni = 30 n 2 = 50 X 1 = 25.2 x 2 = 22.3 01 = 5.3 0 2 = 7 a. What is the value of the test statistic (round to 2 decimals)? 2.09 b. What is the p-value (round to 4 decimals)?...
Test the following claim. Identify the null hypothesis, alternative hypothesis, test statistic, critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim. A manual states that in order to be a hit, a song must be no longer than three minutes and thirty seconds (or 210 seconds). A simple random sample of 50 current hit songs results in a mean length of 252.5 sec. Assume the population standard deviation of song lengths is 53.5 sec....
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