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An independent consumer testing lab preformed a statistical test on 25 type-C alkaline batteries and calculated the mean life for a particular use before they failed was 22.5 hours. The distribution of the lives approximated a normal distribution. The standard deviation of the distribution was 1.1 hours. Information on the package states that the batteries should last 24 hours.
The test question was if this difference between the test statistics and the stated life of the battery was significant? The .05 significant level was selected for the test. Which is the correct statement?
Write a brief summary report on the demographic and class distribution of this sample. Paste the tables and charts into your report and label each of them properly.
What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?
For each set of data, calculate mean, median, mode, range, interquartile range, standard deviation, and coefficient of variation.
Evaluate probabilities using the laws of probability, the standard normal distribution, t-distribution, or X2-distribution.
If the population standard deviation is s = 10, is the sample sufficient to demonstrate a significant effect? Again, assume a two-tailed test with a = 0.05.
Which of the following does not explain a possible relationship between variables when the null hypothesis is rejected
Suppose the investor is to invest a total of $10,000, what is the expected value of perfect information for investor.
In a Sgallop poll of 1012 randomly selected adults, 9% said cloning of humans should be allowed. Use a .05 significance level to the test claim that less than 10% of all adults said that cloning should be allowed.
To estimate the average time it takes to assemble a certain computer component, the industrial engineer at an electronic firm timed 40 technicians in the performance of this task, getting a mean of 12.73 minutes and a standard deviation of 2.06 mi..
What is the expected shape of the distribution of the sample mean?
A bonding company want to insure a construction projects completion. If the project is cancelled due to the contractor's lack of performance
Five cards are drawn from an ordinary deck without replacement. Find the probability of getting:
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