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To evaluate the effect of a treatment, a sample is obtained from a population, with a mean of u = 30, and the treatment is administered to the individuals in the sample. After the treatment, the sample mean is found to be M = 31.3 with a standard deviation of s= 3.
a) If the sample consists of n=16 individuals, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha = 0.05.
b) If the sample consists of n=16 individuals, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with alpha = 0.05.
c) Comparing your answer for parts a and b, how does the size of the sample influence the outcome of a hypothesis test
What is the effect on a confidence interval if one decreases both sample size and the level of confidence?
The mean amount of a purchase at the Smith Hardware store is $23.50 with standard deviation of $5.00. The amounts purchased follow normal distribution.
the management of a department store is interested to estimate the difference in the amount of money spent by female
Construct a 95% confidence interval estimate of the difference in kilometers per liter. Do the results of parts (a) and (b) agree? Explain why or why not.
What are the null and alternative hypothesis for this? What is a type II error in context of this test? Suppose that the researcher deceides not to reject the null hypothesis what sort of error might he be making?
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Generate a 95% confidence interval for the difference in mean HDL levels between men when exercise regularly and those who do not.
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