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How long do new batteries last on a camping trip? A random sample of n1 = 42 small camp flashlights were installed with brand I batteries and left on until the batteries failed. The sample mean lifetime was x1 = 9.8 hours with sample standard deviation s1 = 2.2 hours. Another random sample of n2 = 38 small flashlights of the same model were installed with brand II batteries and left on until the batteries failed. The sample mean of lifetimes was x2 = 8.1 hours with sample standard deviation s2 = 3.5 hours
Computing the mean and standard errors of sampling distribution - Using the central limit theorem, find the means and standard errors of sampling distributions
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
While dealing with 16 students, suppose that the alternative hypothesis has been one-sided and that it was set as Ha :
At the .05 significance level, is the number of units produced on the afternoon shift larger?
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
A commuter travels many miles to work each morning. She has timed this trip 5 times throughout the last month. The time (in minutes) required to make this trip was 44, 39, 41, 35, and 41.
Compute the mean, standard deviation, median, and standard error for each group.
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
For a sample with standard deviation of 10, a score of X = 44 corresponds to z-score of 0.50. Based on this info, determine the sample mean?
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
To find out the estimate of between and within treatments.Samples were selected from 3 populations. The data obtained follow.
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