I. There are two samples with means 15 and 18. Both of those samples consistof 24 observations. Sample standard deviations are equal to 4 in both cases.If you want to test whether the difference between the mean in the first andthe mean in the second population is equal to 0, what is your decision at the.01 level?

Denote μ1, μ2 are the population means for 1st and 2nd populations, respectively.

Answered: There are two samples with means 15 and…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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You hypothesize that people in stats classes are happier than people in all other classes. You compare happiness scores in three of your classes: Statistics, Developmental Psychology, and Social Psychology. In Statistics there are 15 students and the mean happiness rating is 23.1 with a standard deviation of 9.78. In Developmental Psychology there are 15 students and the mean happiness rating is 24.4 with a standard deviation of 2.92. In Social Psychology there are 15 students with a mean rating of 17.7 and standard deviation of 8.46. The sum of squares between groups is equal to 384. The sum of squares within groups is equal to 2461. Use the One-Way ANOVA calculation table to help calculate. What is the degrees of freedom within samples?
You are testing a claim about a population mean of 24. Find the test statistic given the following sample results:mean:22sample size:65standard deviation:10Round to the fourth.
Why is it useful to know the standard error of the mean? (Choose all that are correct.) It is provides a measure of sampling error. It tells you exactly how far a specific sample is from the true mean of the population. It lets you know whether your data is affected by self-selection bias. It tells you how much variability you should expect in the sample means.
We have a distribution with a mean of ? = 35 and ? = 3.5. Find the raw score equivalents for the following z-scores: -3.01, -2.56, -1.21, 1.40, 2.77, 3.00
You are comparing data from two similar experiments that have a mean of 53. Experiment A has a standard deviation of 3.4 and experiment B has a standard deviation of 1.5. What does this tell you about the data in the experiments?
A normal population has a mean of $95 and standard deviation of $14. You select random samples of 50. what is the standard error of the sampling distribution of sample means?
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Parents of teenage boys often complain that auto insurance costs more, on average, for teenage boys than teenage girls. A group of concerned parents examines a random sample of insurance bills. The mean annual cost for 36 teenage boys was $679. For 23 teenage girls, it was $559. From past years, it is known that the population standard deviation for each group is $180. Determine whether or not you believe that the mean cost for auto insurance for teenage boys is greater than that for teenage girls. (Set 1 for boy and Set 2 for girl.) Find the p-value of 2-sample-z-test.
Suppose we were interested in determining if there were differences in the average prices among two local supermarkets. We randomly take the average of 40 items with each store to compare both supermarkets, and we want to know if there is a difference in the average price of grocery items. We computed a hypothetical mean price of items and standard deviation for each supermarket. Which statistical procedure would be best to use for this study?
At a large university, data were collected on the number of sisters and brothers that each student had. Let therandom variable X represent the number of sisters and the random variable Y represent the number ofbrothers. The distribution of X has mean 1.00 and standard deviation 0.94. The distribution of Y has mean1.07 and standard deviation 1.04. What is the mean of the distribution of X+Y? WHAT IS THE CORRECT ANSWER A. 1.98 B. 2.01 C. 2.04 D. 2.0528 E. 2.07
For a sample of n = 20 scores, X = 25 corresponds to z = -1.20 and X = 40 corresponds to z = +1.80. What are the values for the sample mean and standard deviation?
Five students took a self-confidence test. Their deviation scores were –4, +3, +1, –2, and +2. Assuming that these scores com form a normaldistribution, which deviation represents the highest raw score?

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