1. A normal population has a mean of = 25. After receiving a treatment, a sample...
1. A normal population has a mean of = 25. After receiving a treatment, a sample of n = 4 scores yields the following data: 20 28 20 20. Is there evidence for a significant treatment effect? a) Which test should be applied? b) What are the hypotheses? c) What is the critical value? Use an alpha level of .05 with two tails. d) Apply appropriate test 5) Draw your final conclusion.
Homework Answers
![a] For this problems we can use one-sample t-pest because sample size is small and oo is unknown. 6) Hypothesis, Mo. -25 V3 H](http://img.homeworklib.com/questions/42d06460-a259-11ea-9fa6-47868ee3581c.png?x-oss-process=image/resize,w_560)
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1. A normal population has a mean of = 25. After receiving a
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A random sample is selected from a normal population with a mean of μ = 20 and a standard deviation of σ = 10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 25. If the sample consists of n = 4 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with alpha = .05.
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3. A sample is selected from a population with j = 300 After a treatment is...
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A random sample of n - 16 scores is selecdted from a normal population with a mean of p - 50. After atreatment is administered to the individuals in the sample, the sample mean is found to be M -54 If the population standard deviation is σ-8, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α-.05. (Hint: Recall that the critical value for a two-tailed test with α-.05 is...
3. A sample is selected from a population with j = 300 After a treatment is administered to the individuals, t sample mean is found to be M = 280 and the variance is $2 = 100 (S = 10). If the sample has n = 16 scores, the calculate the estimated standard error and determine whether the sample is sufficient to conclude that the treatment has a significant effect? Use a two tailed test with a =.05.
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