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How many subjects be studied in each of two equal sized groups to achieve 80% power to detect a differentiate of 0.5 between the null hypothesis that both group means are 0.0 and the alternative hypothesis that the mean of group 2 is 0.5? Assume that the group standard deviations are 1.0 in both groups. Make your calculation assuming a two-sided two-sample t-test with a type I error (alpha) of 0.056
a. 6
b. 9
c. 17
d. 64
e. 253
Construct a 95 percent confidence interval for the true mean.
Consider the following stemplot. The mean of the data represented in this stemplot ?
Construct a probability for the number of students in the sample who watch soap operas.
Supposing that the entire $10,000 can be spent on tires (ignoring other costs), and that the true fraction that will fail is approximately .05, can NHTSA attain its goal while staying within the budget? Describe.
Below you are given a partial computer output based on a sample of 16 observations.
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
write down the hypothesis the test used the p-value and the interpretation then hand calculates a 95% CL for the odds ratio estimate on this last test.
Consider a four digit uniform random number generator; as in each of the 10,000 values 0.0000 through 9999 is equally likely. Find the mean and variance of the values produced by such a random number generator.
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
What is the null hypothesis? Use α =0.05. Compute critical value. Use α =0.05.
Determine margin of error for confidence interval in (a)?
Test out an suitable hypothesis also state your conclusion. Make sure the suitable assumption as well as conditions are satisfied before you proceed.
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