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Q1) Test effectiveness of a treatment, a sample of n=25 people is selected from normal population with a mean of μ=60. After treatment is administered to individuals in sample, the sample mean is found to be M = 55.
a) If population standard deviation is σ=10, can you conclude that treatment has significant effect? Use two-tailed test with α = 0.05.
b) If population standard deviation is σ=20, can you conclude that treatment has a significant effect? Use two-tailed test with α = 0.05.
c) Calculate Cohen's d to measure effect size for both tests (σ=20 and σ=10).
d) Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
Illustrate what can we say about the probability distribution. Is it approximately normal, elucidate the mean and standard deviation.
In 1965, a newspaper carried a story about a high school student who reported getting 9207 heads and 8743 tails in 17,950 coin tosses. Is this a significant discrepancy from the null hypothesis H 0 = 1/2.
would this prove that they are exceeding their goal, using = .025?
At a large commercial bakery, one of the measures familiar with evaluate employees is the number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and bro..
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A range of values constructed from sample data so that the parameter occurs within that range at a specified probability is:
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When a sample mean is greater than the true, population mean, the resulting difference is called:
It is impossible to obtain a standard error less than 2 for any sized sample.
Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
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