Two tailed hypothesis test of a difference
For a two tailed hypothesis test of a difference of means with α=.05 and df=30, we have the following critical values:
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A UCLA researcher claims that the life span of mice can be extended by as much as 25% when the calories in their food are reduced by approximately 40% from the time they are weaned.
A sample of pieces is taken and the diameters are 1.01, 0.97, 1.03, 1.04, 0.99, 0.98, 0.99, 1.01, and 1.03 centimeters. Find a 99% confidence interval for the mean diameter of pieces from this machine, assuming an approximate normal distribution.
We estimate the mean price of a cell phone in the Bay Area using a 95% level of confidence. From a random sample of 25 stores the mean price was found to be $150 with a standard deviation of $15
For a hypothesis test of a difference of means with n1=35 and n2=45, what is the value for the degrees of freedom, df?
Construct a 98% Confidence Interval for the difference of the proportion between the drug group and the placebo group. Using a significance level of .01, test the claim that the drug is effective using a hypothesis test of the difference of the pr
State two ways in which the standard normal distribution and the Student's t-distribution are alike. State two ways in which the standard normal distribution and the Student's t-distribution are different.
In a survey, 600 mothers and fathers were asked about the importance of sports for boys and girls. Of the parents interviewed, 70% said the genders are equal and should have equal opportunities to participate in sports.
A random sample of 31 patients with arthritis took the drug for 3 months. Blood test showed that x-bar = 8.1 with sample standard deviation s = 1.9. Use a 5% level of significance to test the claim that the drug has changed (either way) the mean p
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