as though it were at what level of measurement? d. Experimental 2. What was the mean posttest empowerment score for the control group? The mean posttest empowerment score was 97.12 3. Compare the mean baseline and posttest depression scores of the experimental group. Was this an expected finding? Provide a rationale for your answer. The mean baseline depression score of the experimental group is 14.00. The mean posttest depression score of the experimental group is 13.36. The posttest score
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9.54 (a) At the .01 level of significance‚is the true mean greater than 10? Null Hypothesis: Ho: M = 10 :Mean is 10 or less pages Alternative Hypothesis: H1: M >10 :Mean is more than 10 pages Significance level=alpha (a) = 0.01 or 1% No of tails= 1 This is a 1-tailed test because we are testing that the mean is greater than 10 Since sample size= 35 >= 30 we will use normal distribution This is a one tailed test because we are testing the area in the right tail Since
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absorbency will be repeated three times in order to find the mean of each sample and to also find out the standard deviation of each set of data which will be recorded in a table format. The temperature rising will cause damage to the cell membrane due to the temperature rising above the membranes temperature. The mean absorbency will be calculated from five different temperatures starting from 0‚ 40‚ 60‚ 80 and 100 degree. From this experiment‚ the mean absorbance for all the five temperatures should be between
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Example: Amount of money earned by new immigrants Sample: 12‚ 15‚ 16‚ 20‚ 25‚ 36‚ 40 Step 1: Find the mean * x̄=164/7 * mean is 23.4 Step 2: Find how much each observation deviates from the mean * 12 - 23.4 = -11.4 * 15 – 23.4 = -8.4 * 16 – 23.4 = -7.4 * 20 – 23.4 = -3.4 * 25 – 23.4 = 1.6 * 36 – 23.4 = 12.6 * 40 – 23.4 = 16.6 * Note: all observations below mean will be negative‚ all above will be positive Step 3: Square the deviations * (-11.4)² = 129
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Preliminary Observations • The Mean of AA Fly (7.167) is lesser than TT Air (10.229). This means that the average number of hours of AA Fly is lesser than TT Air during each 24-hour period i.e. (10.229-7.167=3.062). • The sample size of AA Fly (27) is lesser than TT Air (28). Even though AA Fly’s sample is 1 day shorter than TT Air‚ it does not significantly affect the output as the one day does not change much (unless there had been a market shock). However based on Central Limit Theorem‚
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the same group. 3.1 SINGLE-SAMPLE T-TEST Single Sample t-test involves one group. The single sample t-test is used to describe the nature of the population confidence intervals or compare the group mean to a specified value. To establish confidence intervals‚ the mean and the standard error of the mean are calculated and the confidence intervals are
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WITH NUMERICAL DATA 1. The t test for the difference between the means of 2 independent populations assumes that the respective a) sample sizes are equal. b) sample variances are equal. c) populations are approximately normal. d) all of the above ANSWER: c TYPE: MC DIFFICULTY: Moderate KEYWORDS: pooled-variance t test‚ assumption 2. The t test for the mean difference between 2 related populations assumes that the respective
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intake and March 2012 intake of the SAM students of Taylor’s College Subang Jaya campus who are taking Mathematical subject. The size of the population is 722 people. Based on the data‚ the parameters that can be measured include standard deviation‚ mean‚ and percentage. There are several problems such as some students might answer the survey more than once‚ possibly resulting in repeating data. There are also cases where not all students answer the survey as told‚ resulting in inaccuracy of results
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the cost of unleaded gasoline was $0.95 per gallon. In 2010‚ the same type of gasoline costs $3.00 per gallon. To determine the amount of change‚ we have to use the a. moving average technique b. geometric mean of 2 years c. geometric mean rate of increase d. weighted mean of the 2 years Objective: Apply probability concepts related to discrete and continuous probability distributions. 2. Which of the following is a major difference between the binomial and the hypergeometric distributions
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part of the population C. could not be 22 D. could be larger‚ smaller‚ or equal to 22 Since a sample is a subset of the population‚ the sample mean A. is always smaller than the mean of the population B. is always larger than the mean of the population C. must be equal to the mean of the population D. can be larger‚ smaller‚ or equal to the mean of the population Use the following situation for Questions 4-7. Michael‚ Inc.‚ a manufacturer of electric defibrillators‚ is a firm that makes
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