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An independent-measures research study uses two samples, each with n = 12 participants. If the data produce a t statistic of t = 2.50, what are the correct decisions for a two-tailed hypothesis test at .01 and at .05? Could you include how you came to find the answer?
Find all critical points of f (x) and classify them as maximums or minimums. State the intervals where f (x) is increasing and decreasing.
Explain why an observed value of 250 hours is not unusual for an individual light bulb, even though it is outside the confidence interval you calculated.
What is the importance of pretesting questions and instruments? What are risks of not doing this? Provide an example.
At 5% level of significance, is there evidence of difference in mean life of bulbs made by the 2 kinds of machines. What is your conclusion?
The number who will go to the Ohio State University is a binomial random variable. What is the mean number of seniors going to the Ohio State University?
Two balanced dice are rolled and the number of dots facing up is added. Find the probability that the sum is 10 or 12.
a. What z-score separates the highest 25% from the rest of the scores?
The standard deviation is 2 pounds. If 15% of the suitcases are overweight, Determine the maximum weight allowed by the airline. Assume the variable is normally distributed.
you measure the lifetime of a random sample of 64 tires of a certain brand. the sample mean is x 50 months. suppose
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
hypothesis testing of single mean.a recent article in the wall street journal reported that the 30-year mortgage rate
let 30 percent of the people in new york favor ice cream. if 500 people are surveyed at random what is the probability
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