A researcher is using a dependent t-test to evaluate the difference between two treatments. If the differencebetween the treatments is consistent from one participant to another, then the data should producea large variance for the difference scores and a small standard errora large variance for the difference scores and a large standard errora small variance for the difference scores and a small standard errora small variance for the difference scores and a large standard error

Option C) A small variance for difference scores and a small std.error.

Answered: A researcher is using a dependent…

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015

1st Edition

ISBN:9781680331141

Author:HOUGHTON MIFFLIN HARCOURT

Publisher:HOUGHTON MIFFLIN HARCOURT

Chapter4: Writing Linear Equations

Section: Chapter Questions

Problem 14CR

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A drug, which is used for treating cancer, has potentially dangerous side effects if it is taken in doses which are larger than the required dosage for the treatment. The tablet should contain 47.87 mg and the variance should be 0.04. 15 tablets are randomly selected and the amount of drug in each tablet is measured. The sample has a mean of 47.875 mg and a variance of 0.0008 mg. Does the data suggest at a = 0.05 that the tablets do not have the desired variance? Step 5 of 5: What is the conclusion?
A tutor gave me this answer but as you can see it is not correct. plz help
You are conducting a study to see if students do better when they study all at once or in intervals. One group of 12 participants took a test after studying for one hour continuously. The other group of 12 participants took a test after studying for three twenty minute sessions. The first group had a mean score of 75 and a variance of 120. The second group had a mean score of 86 and a variance of 100. What is the calculated t value? Are the mean test scores of these two groups significantly different at the .05 level? What would the t value be if there were only 6 participants in each group? Would the scores be significant at the .05 level?
The mean age of children at the X College daycare center is 6. The ages are skewed in a negative direction by a large number of 3 and 4 year old students. The variance of ages is 5.1. At least 66% of the children will be between what two ages?
If a set of data is normally distributed with a mean of 20 and a variance of 16, a z-score of -3.8 would convert into what raw score?
MEANS OF TWO SAMPLES (VARIANCES UNKNOWN) AND OBSERVED OBSERVATIONS Give the complete Test of Hypothesis
a linear contrast is a linear combination of variables (parameters or statistics) whose coefficients add up to zero. This is used to compare different levels of a factor in analysis of variance (ANOVA), for example. The coefficients are chosen based on the specific comparisons of interest and they usually sum to zero. This is to ensure that the contrast is not influenced by the overall mean. But the weighted average is most often computed to equalize the frequency of the values in a data set. What then does the weighted average do in a linear contrast? I know that the weights in a linear contrast are used to emphasize or de-emphasize different variables in the combination. But how does it do this and what is the procedure or process for how they are determined?
Some transportation experts claim that it is the variability of speeds, rather than the level of speeds, that is a critical factor in determining the likelihood of an accident occurring. One of the experts claims that driving conditions are dangerous if the variance of speeds exceeds 76 (mph) 2. On a heavily traveled highway, a random sample of 53 cars revealed a mean and a variance of speeds of 62.5 mph and 96.4 (mph) 2, respectively. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Select the competing hypotheses to test if the variance of speeds exceeds 76 (mph) ². 0² ≤ 76; HA: 0² > 76 HØ: Ho: 0²2 76; HA: 0² 0.10 b-2. At the 10% significance level, can you conclude that driving conditions are dangerous on this highway? Reject Ho; we can conclude the variance of the speeds is greater than 76 mpg². Do not reject Ho; we cannot conclude the variance of the speeds is greater than 76 mpg². Reject Ho; we cannot conclude the variance of the speeds…
Professor Hayashi has implemented a new book for his Fall 2013 statistics course. He wants to see if the new book has an effect on the exam average for Exam 3. He knows that the Exam 3 mean for all students who have taken his statistic course over the past 10 years is 77.2. He collects some data from a sample of 9 students and finds that the Exam 3 mean for his Fall 2013 statistics students is 81.7 with a variance of 32.49.Estimate effect size by constructing 90% an confidence interval.Group of answer choices 81.7 plus or minus 1.345 points 81.7 plus or minus 2.216 points 81.7 plus or minus 3.534 points 81.7 plus or minus 5.534 points
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The nation of Olecarl, located in the South Pacific, has asked you to analyze international trade patterns. You first discover that each year it exports 10 units and imports 10 units of wonderful stuff. The price of exports is a random variable with a mean of 100 and a variance of 100. The price of imports is a random variable with a mean of 90 and a variance of 400. In addition, you discover that the prices of imports and exports have a correlation of ρ = -0.40. The prices of both exports and imports follow a normal probability density function. Define the balance of trade as the difference between the total revenue from exports and the total cost of imports. a. What are the mean and variance of the balance of trade? b. What is the probability that the balance of trade is negative?
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